From e1790c55bd011eca3251c46766cc759a47039091 Mon Sep 17 00:00:00 2001 From: Lassi Kortela Date: Sat, 11 Mar 2023 22:16:44 +0200 Subject: [PATCH] Download from Wayback Machine These binary files are shown in the log but excluded from this commit: * gps10bin.zip * gps10src.zip * mfc40dll.zip $ wayback_machine_downloader --all-timestamps www.cs.bgu.ac.il/~elad/GALAPAGOS Downloading www.cs.bgu.ac.il/~elad/GALAPAGOS to websites/www.cs.bgu.ac.il/~elad/GALAPAGOS/ from Wayback Machine archives. Getting snapshot pages.. found 52 snaphots to consider. file_list_curated: 52 52 files to download: http://www.cs.bgu.ac.il:80/~elad/GALAPAGOS/ -> websites/www.cs.bgu.ac.il/~elad/GALAPAGOS/19970726164741/~elad/GALAPAGOS/index.html (1/52) http://www.cs.bgu.ac.il:80/%7Eelad/GALAPAGOS/ -> websites/www.cs.bgu.ac.il/~elad/GALAPAGOS/19981205205433/~elad/GALAPAGOS/index.html (2/52) http://www.cs.bgu.ac.il:80/~elad/GALAPAGOS/ -> websites/www.cs.bgu.ac.il/~elad/GALAPAGOS/20010430130433/~elad/GALAPAGOS/index.html (3/52) https://www.cs.bgu.ac.il/~elad/GALAPAGOS/ -> websites/www.cs.bgu.ac.il/~elad/GALAPAGOS/20220312053305/~elad/GALAPAGOS/index.html (4/52) https://www.cs.bgu.ac.il/~elad/GALAPAGOS/ -> websites/www.cs.bgu.ac.il/~elad/GALAPAGOS/20220312053307/~elad/GALAPAGOS/index.html (5/52) http://www.cs.bgu.ac.il:80/~elad/GALAPAGOS/back.gif -> websites/www.cs.bgu.ac.il/~elad/GALAPAGOS/19970812032339/~elad/GALAPAGOS/back.gif (6/52) http://www.cs.bgu.ac.il:80/~elad/GALAPAGOS/background.html -> websites/www.cs.bgu.ac.il/~elad/GALAPAGOS/19970806122533/~elad/GALAPAGOS/background.html (7/52) http://www.cs.bgu.ac.il:80/%7Eelad/GALAPAGOS/background.html -> websites/www.cs.bgu.ac.il/~elad/GALAPAGOS/19991006050747/~elad/GALAPAGOS/background.html (8/52) http://www.cs.bgu.ac.il:80/~elad/GALAPAGOS/background.html -> websites/www.cs.bgu.ac.il/~elad/GALAPAGOS/20010608213604/~elad/GALAPAGOS/background.html (9/52) http://www.cs.bgu.ac.il:80/~elad/GALAPAGOS/bgu_logo_tiny.gif -> websites/www.cs.bgu.ac.il/~elad/GALAPAGOS/19970806122524/~elad/GALAPAGOS/bgu_logo_tiny.gif (10/52) http://www.cs.bgu.ac.il:80/~elad/GALAPAGOS/bib.html -> websites/www.cs.bgu.ac.il/~elad/GALAPAGOS/19970806122740/~elad/GALAPAGOS/bib.html (11/52) http://www.cs.bgu.ac.il:80/%7Eelad/GALAPAGOS/bib.html -> websites/www.cs.bgu.ac.il/~elad/GALAPAGOS/19991006061546/~elad/GALAPAGOS/bib.html (12/52) http://www.cs.bgu.ac.il:80/~elad/GALAPAGOS/bib.html -> websites/www.cs.bgu.ac.il/~elad/GALAPAGOS/20010608214537/~elad/GALAPAGOS/bib.html (13/52) http://www.cs.bgu.ac.il:80/~elad/GALAPAGOS/Envs.gif -> websites/www.cs.bgu.ac.il/~elad/GALAPAGOS/19970812032348/~elad/GALAPAGOS/Envs.gif (14/52) http://www.cs.bgu.ac.il:80/~elad/GALAPAGOS/Envs2.gif -> websites/www.cs.bgu.ac.il/~elad/GALAPAGOS/19970812032356/~elad/GALAPAGOS/Envs2.gif (15/52) http://www.cs.bgu.ac.il:80/~elad/GALAPAGOS/extensions.html -> websites/www.cs.bgu.ac.il/~elad/GALAPAGOS/19970806122623/~elad/GALAPAGOS/extensions.html (16/52) http://www.cs.bgu.ac.il:80/%7Eelad/GALAPAGOS/extensions.html -> websites/www.cs.bgu.ac.il/~elad/GALAPAGOS/19990424140956/~elad/GALAPAGOS/extensions.html (17/52) http://www.cs.bgu.ac.il:80/~elad/GALAPAGOS/extensions.html -> websites/www.cs.bgu.ac.il/~elad/GALAPAGOS/20010608215359/~elad/GALAPAGOS/extensions.html (18/52) http://www.cs.bgu.ac.il:80/~elad/GALAPAGOS/gps.gif -> websites/www.cs.bgu.ac.il/~elad/GALAPAGOS/19970806122512/~elad/GALAPAGOS/gps.gif (19/52) http://www.cs.bgu.ac.il:80/~elad/GALAPAGOS/gps10bin.zip -> websites/www.cs.bgu.ac.il/~elad/GALAPAGOS/19970806123128/~elad/GALAPAGOS/gps10bin.zip (20/52) http://www.cs.bgu.ac.il:80/~elad/GALAPAGOS/gps10src.zip -> websites/www.cs.bgu.ac.il/~elad/GALAPAGOS/19970806123709/~elad/GALAPAGOS/gps10src.zip (21/52) http://www.cs.bgu.ac.il:80/~elad/GALAPAGOS/gui.html -> websites/www.cs.bgu.ac.il/~elad/GALAPAGOS/19970806122632/~elad/GALAPAGOS/gui.html (22/52) http://www.cs.bgu.ac.il:80/%7Eelad/GALAPAGOS/gui.html -> websites/www.cs.bgu.ac.il/~elad/GALAPAGOS/19990128140433/~elad/GALAPAGOS/gui.html (23/52) http://www.cs.bgu.ac.il:80/~elad/GALAPAGOS/gui.html -> websites/www.cs.bgu.ac.il/~elad/GALAPAGOS/20010608220120/~elad/GALAPAGOS/gui.html (24/52) http://www.cs.bgu.ac.il:80/~elad/GALAPAGOS/img00001.gif -> websites/www.cs.bgu.ac.il/~elad/GALAPAGOS/19970812032406/~elad/GALAPAGOS/img00001.gif (25/52) http://www.cs.bgu.ac.il:80/~elad/GALAPAGOS/img00002.gif -> websites/www.cs.bgu.ac.il/~elad/GALAPAGOS/19970812032416/~elad/GALAPAGOS/img00002.gif (26/52) http://www.cs.bgu.ac.il:80/~elad/GALAPAGOS/img00002.gif -> websites/www.cs.bgu.ac.il/~elad/GALAPAGOS/20000427155438/~elad/GALAPAGOS/img00002.gif (27/52) http://www.cs.bgu.ac.il:80/~elad/GALAPAGOS/img00002.gif -> websites/www.cs.bgu.ac.il/~elad/GALAPAGOS/20000927202854/~elad/GALAPAGOS/img00002.gif (28/52) http://www.cs.bgu.ac.il:80/~elad/GALAPAGOS/img00003.gif -> websites/www.cs.bgu.ac.il/~elad/GALAPAGOS/19970812032426/~elad/GALAPAGOS/img00003.gif (29/52) http://www.cs.bgu.ac.il:80/~elad/GALAPAGOS/img00010.gif -> websites/www.cs.bgu.ac.il/~elad/GALAPAGOS/19970812032447/~elad/GALAPAGOS/img00010.gif (30/52) http://www.cs.bgu.ac.il:80/~elad/GALAPAGOS/img00011.gif -> websites/www.cs.bgu.ac.il/~elad/GALAPAGOS/19970812032457/~elad/GALAPAGOS/img00011.gif (31/52) http://www.cs.bgu.ac.il:80/~elad/GALAPAGOS/img00012.gif -> websites/www.cs.bgu.ac.il/~elad/GALAPAGOS/19970812032510/~elad/GALAPAGOS/img00012.gif (32/52) http://www.cs.bgu.ac.il:80/~elad/GALAPAGOS/img00013.gif -> websites/www.cs.bgu.ac.il/~elad/GALAPAGOS/19970812032521/~elad/GALAPAGOS/img00013.gif (33/52) http://www.cs.bgu.ac.il:80/~elad/GALAPAGOS/implementation.html -> websites/www.cs.bgu.ac.il/~elad/GALAPAGOS/19970806122650/~elad/GALAPAGOS/implementation.html (34/52) http://www.cs.bgu.ac.il:80/%7Eelad/GALAPAGOS/implementation.html -> websites/www.cs.bgu.ac.il/~elad/GALAPAGOS/19990128153816/~elad/GALAPAGOS/implementation.html (35/52) http://www.cs.bgu.ac.il:80/~elad/GALAPAGOS/implementation.html -> websites/www.cs.bgu.ac.il/~elad/GALAPAGOS/20010608220848/~elad/GALAPAGOS/implementation.html (36/52) http://www.cs.bgu.ac.il:80/~elad/GALAPAGOS/index.html -> websites/www.cs.bgu.ac.il/~elad/GALAPAGOS/19970812032301/~elad/GALAPAGOS/index.html (37/52) http://www.cs.bgu.ac.il:80/%7Eelad/GALAPAGOS/index.html -> websites/www.cs.bgu.ac.il/~elad/GALAPAGOS/19990417073305/~elad/GALAPAGOS/index.html (38/52) http://www.cs.bgu.ac.il:80/~elad/GALAPAGOS/index.html -> websites/www.cs.bgu.ac.il/~elad/GALAPAGOS/20010921035619/~elad/GALAPAGOS/index.html (39/52) http://www.cs.bgu.ac.il:80/~elad/GALAPAGOS/manual.html -> websites/www.cs.bgu.ac.il/~elad/GALAPAGOS/19970806122731/~elad/GALAPAGOS/manual.html (40/52) http://www.cs.bgu.ac.il:80/%7Eelad/GALAPAGOS/manual.html -> websites/www.cs.bgu.ac.il/~elad/GALAPAGOS/19990129014748/~elad/GALAPAGOS/manual.html (41/52) http://www.cs.bgu.ac.il:80/~elad/GALAPAGOS/manual.html -> websites/www.cs.bgu.ac.il/~elad/GALAPAGOS/20010608221151/~elad/GALAPAGOS/manual.html (42/52) http://www.cs.bgu.ac.il:80/~elad/GALAPAGOS/mfc40dll.zip -> websites/www.cs.bgu.ac.il/~elad/GALAPAGOS/20010614210623/~elad/GALAPAGOS/mfc40dll.zip (43/52) http://www.cs.bgu.ac.il:80/~elad/GALAPAGOS/next.gif -> websites/www.cs.bgu.ac.il/~elad/GALAPAGOS/19970812032317/~elad/GALAPAGOS/next.gif (44/52) http://www.cs.bgu.ac.il:80/~elad/GALAPAGOS/next.gif -> websites/www.cs.bgu.ac.il/~elad/GALAPAGOS/20000429040644/~elad/GALAPAGOS/next.gif (45/52) http://www.cs.bgu.ac.il:80/~elad/GALAPAGOS/next.gif -> websites/www.cs.bgu.ac.il/~elad/GALAPAGOS/20000927044316/~elad/GALAPAGOS/next.gif (46/52) http://www.cs.bgu.ac.il:80/~elad/GALAPAGOS/prev.gif -> websites/www.cs.bgu.ac.il/~elad/GALAPAGOS/19970812032310/~elad/GALAPAGOS/prev.gif (47/52) http://www.cs.bgu.ac.il:80/~elad/GALAPAGOS/stone.jpg -> websites/www.cs.bgu.ac.il/~elad/GALAPAGOS/19970806122448/~elad/GALAPAGOS/stone.jpg (48/52) http://www.cs.bgu.ac.il:80/~elad/GALAPAGOS/toc.gif -> websites/www.cs.bgu.ac.il/~elad/GALAPAGOS/19970812032330/~elad/GALAPAGOS/toc.gif (49/52) http://www.cs.bgu.ac.il:80/~elad/GALAPAGOS/toc.gif -> websites/www.cs.bgu.ac.il/~elad/GALAPAGOS/20000427162611/~elad/GALAPAGOS/toc.gif (50/52) http://www.cs.bgu.ac.il:80/~elad/GALAPAGOS/toc.gif -> websites/www.cs.bgu.ac.il/~elad/GALAPAGOS/20000927020528/~elad/GALAPAGOS/toc.gif (51/52) http://www.cs.bgu.ac.il:80/~elad/GALAPAGOS/vision.gif -> websites/www.cs.bgu.ac.il/~elad/GALAPAGOS/19970812032438/~elad/GALAPAGOS/vision.gif (52/52) Download completed in 87.05s, saved in websites/www.cs.bgu.ac.il/~elad/GALAPAGOS/ (52 files) --- .../19970726164741/~elad/GALAPAGOS/index.html | 95 ++ .../19970806122448/~elad/GALAPAGOS/stone.jpg | Bin 0 -> 5661 bytes .../19970806122512/~elad/GALAPAGOS/gps.gif | Bin 0 -> 40478 bytes .../~elad/GALAPAGOS/bgu_logo_tiny.gif | Bin 0 -> 137 bytes .../~elad/GALAPAGOS/background.html | 130 ++ .../~elad/GALAPAGOS/extensions.html | 493 ++++++ .../19970806122632/~elad/GALAPAGOS/gui.html | 73 + .../~elad/GALAPAGOS/implementation.html | 393 +++++ .../~elad/GALAPAGOS/manual.html | 1404 +++++++++++++++++ .../19970806122740/~elad/GALAPAGOS/bib.html | 81 + .../19970812032301/~elad/GALAPAGOS/index.html | 95 ++ .../19970812032310/~elad/GALAPAGOS/prev.gif | Bin 0 -> 752 bytes .../19970812032317/~elad/GALAPAGOS/next.gif | Bin 0 -> 740 bytes .../19970812032330/~elad/GALAPAGOS/toc.gif | Bin 0 -> 2417 bytes .../19970812032339/~elad/GALAPAGOS/back.gif | Bin 0 -> 1543 bytes .../19970812032348/~elad/GALAPAGOS/Envs.gif | Bin 0 -> 1429 bytes .../19970812032356/~elad/GALAPAGOS/Envs2.gif | Bin 0 -> 1780 bytes .../~elad/GALAPAGOS/img00001.gif | Bin 0 -> 6581 bytes .../~elad/GALAPAGOS/img00002.gif | Bin 0 -> 6853 bytes .../~elad/GALAPAGOS/img00003.gif | Bin 0 -> 1085 bytes .../19970812032438/~elad/GALAPAGOS/vision.gif | Bin 0 -> 3536 bytes .../~elad/GALAPAGOS/img00010.gif | Bin 0 -> 1031 bytes .../~elad/GALAPAGOS/img00011.gif | Bin 0 -> 3801 bytes .../~elad/GALAPAGOS/img00012.gif | Bin 0 -> 18528 bytes .../~elad/GALAPAGOS/img00013.gif | Bin 0 -> 4653 bytes .../19981205205433/~elad/GALAPAGOS/index.html | 95 ++ .../19990128140433/~elad/GALAPAGOS/gui.html | 73 + .../~elad/GALAPAGOS/implementation.html | 393 +++++ .../~elad/GALAPAGOS/manual.html | 1404 +++++++++++++++++ .../19990417073305/~elad/GALAPAGOS/index.html | 95 ++ .../~elad/GALAPAGOS/extensions.html | 493 ++++++ .../~elad/GALAPAGOS/background.html | 130 ++ .../19991006061546/~elad/GALAPAGOS/bib.html | 81 + .../~elad/GALAPAGOS/img00002.gif | Bin 0 -> 6853 bytes .../20000427162611/~elad/GALAPAGOS/toc.gif | Bin 0 -> 2417 bytes .../20000429040644/~elad/GALAPAGOS/next.gif | Bin 0 -> 740 bytes .../20000927020528/~elad/GALAPAGOS/toc.gif | Bin 0 -> 2417 bytes .../20000927044316/~elad/GALAPAGOS/next.gif | Bin 0 -> 740 bytes .../~elad/GALAPAGOS/img00002.gif | Bin 0 -> 6853 bytes .../20010430130433/~elad/GALAPAGOS/index.html | 95 ++ .../~elad/GALAPAGOS/background.html | 130 ++ .../20010608214537/~elad/GALAPAGOS/bib.html | 81 + .../~elad/GALAPAGOS/extensions.html | 493 ++++++ .../20010608220120/~elad/GALAPAGOS/gui.html | 73 + .../~elad/GALAPAGOS/implementation.html | 393 +++++ .../~elad/GALAPAGOS/manual.html | 1404 +++++++++++++++++ .../20010921035619/~elad/GALAPAGOS/index.html | 95 ++ .../20220312053305/~elad/GALAPAGOS/index.html | 95 ++ .../20220312053307/~elad/GALAPAGOS/index.html | 95 ++ 49 files changed, 8482 insertions(+) create mode 100644 websites/www.cs.bgu.ac.il/~elad/GALAPAGOS/19970726164741/~elad/GALAPAGOS/index.html create mode 100644 websites/www.cs.bgu.ac.il/~elad/GALAPAGOS/19970806122448/~elad/GALAPAGOS/stone.jpg create mode 100644 websites/www.cs.bgu.ac.il/~elad/GALAPAGOS/19970806122512/~elad/GALAPAGOS/gps.gif create mode 100644 websites/www.cs.bgu.ac.il/~elad/GALAPAGOS/19970806122524/~elad/GALAPAGOS/bgu_logo_tiny.gif create mode 100644 websites/www.cs.bgu.ac.il/~elad/GALAPAGOS/19970806122533/~elad/GALAPAGOS/background.html create mode 100644 websites/www.cs.bgu.ac.il/~elad/GALAPAGOS/19970806122623/~elad/GALAPAGOS/extensions.html create mode 100644 websites/www.cs.bgu.ac.il/~elad/GALAPAGOS/19970806122632/~elad/GALAPAGOS/gui.html create mode 100644 websites/www.cs.bgu.ac.il/~elad/GALAPAGOS/19970806122650/~elad/GALAPAGOS/implementation.html create mode 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websites/www.cs.bgu.ac.il/~elad/GALAPAGOS/20010608220848/~elad/GALAPAGOS/implementation.html create mode 100644 websites/www.cs.bgu.ac.il/~elad/GALAPAGOS/20010608221151/~elad/GALAPAGOS/manual.html create mode 100644 websites/www.cs.bgu.ac.il/~elad/GALAPAGOS/20010921035619/~elad/GALAPAGOS/index.html create mode 100644 websites/www.cs.bgu.ac.il/~elad/GALAPAGOS/20220312053305/~elad/GALAPAGOS/index.html create mode 100644 websites/www.cs.bgu.ac.il/~elad/GALAPAGOS/20220312053307/~elad/GALAPAGOS/index.html diff --git a/websites/www.cs.bgu.ac.il/~elad/GALAPAGOS/19970726164741/~elad/GALAPAGOS/index.html b/websites/www.cs.bgu.ac.il/~elad/GALAPAGOS/19970726164741/~elad/GALAPAGOS/index.html new file mode 100644 index 0000000..56faa74 --- /dev/null +++ b/websites/www.cs.bgu.ac.il/~elad/GALAPAGOS/19970726164741/~elad/GALAPAGOS/index.html @@ -0,0 +1,95 @@ + + + + Galapagos + + + +

Welcome to
+GALAPAGOS

+ +Galapagos is an interactive multithreaded Scheme interpreter with turtle +graphics for Windows 95. It is built around the SCM interpreter, and it +provides multiple interpreters, threads, turtles, and drawing boards, all +running concurrently using WIN32's multithreading abilities, and freely +available. + +

+

+

+

+

+Spring 1997

+Graduation project

+Department of Math & Computer Science,

+Ben-Gurion University of the Negev

+
+Written by Elad Eyal and Miki +Tebeka.
+
+Supervisor: Dr. Michael Elhadad +
+

+

+

+

+ +

TABLE OF CONTENTS

+ + + +

+ +
+ +

DOWNLOAD CENTER

+

+

GNU LICENSE. COPYRIGHTED. PROVIDED "AS IS". NO +WARRANTIES OR LIABILITIES. ETC.
+

+

+500K gps10bin.zip - Executable and required Scheme libraries (SLIB)
+700K gps10src.zip - Same with all source code
+400K mfc40dll.zip - You might need this MFC40.DLL if you +don't have it already.
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+

+ [PREV] + [PREV] + [PREV] +
+
+

+

Background

+ + + +

+

+ +

SCHEME

+ +

Scheme is a dialect of Lisp that stresses conceptual elegance and simplicity. +It is specified in R4RS and IEEE standard P1178. Scheme is much smaller +than Common Lisp; the specification is about 50 pages, compared to Common +Lisp's 1300 page draft standard. (See the Lisp FAQ for details on standards +for Common Lisp.) Advocates of Scheme often find it amusing that the entire +Scheme standard is shorter than the index to Guy Steele's "Common +Lisp: the Language, 2nd Edition".
+

+ +

Scheme is often used in computer science curricula and programming language +research, due to its ability to represent many programming abstractions +with its simple primitives.
+

+ +

There are a lot of traditional SCHEME interpreter available such as +Chez, ELK 2.1, GAMBIT, MITScheme, scheme->C, Scheme48, T3.1, VSCM and +Scm4e. Many free Scheme implementations (as well as SCM) are available +from swiss-ftp.ai.mit.edu [18.43.0.246].
+

+ +

Galapagos is built over the SCM interpreter version 4e4 written by Aubrey +Jaffer <jaffer@ai.mit.edu>.
+
+
+

+ +

LOGO AND TURTLE GEOMETRY
+

+ +

LOGO is a programming language designed for use by learners, including +children. It is a dialect of LISP which has a more natural syntax, using +infix arithmetics and (almost) no parentheses. LOGO features a "turtle" +which can be instructed to move across the screen and draw shapes. This +became known as "Turtle Graphics" or "Turtle Geometry" +- a geometry that describes paths "from within" rather than "from +outside" or "from above." For example, "turn right" +means turn right relative to whatever direction you were heading before; +by contrast, "turn east" specifies an apparently absolute direction. +A Logo user or program manipulates the graphical turtle by telling it to +move forward or back some number of steps, or by telling it to turn left +or right some number of degrees.
+

+ +

Turtle geometry has two major advantages. One is that many paths are +more simply described in relative than in absolute terms. For example, +it's easy to indicate the absolute coordinates of the corners of a square +with vertical and horizontal sides, but it's not so easy to find the corners +of an inclined square. In turtle geometry the same commands (go forward, +turn right 90 degrees, etc.) work for squares with any orientation. +The second advantage is pedagogic rather than computational: turtle geometry +is compatible with a learner's own experience of moving in the world - +it's "body syntonic."
+

+ +

OBJECTIVES
+

+ +

The two major goals behind Galapagos were:
+

+ +

First, we wanted to create an environment suitable for teaching programming, +patterned after Logo's environment and its easy-to-understand, easy-to-use +turtle geometry. We chose Scheme as the programming language because of +its educational value, as noted before. We added Turtle Graphics because +of its ability to visualize computations, and thus help understanding them +better.
+

+ +

Second, we wanted to add parallel programming. The importance of multiprocessor +machines and of multithreading is becoming more apparent every day, and +so is the need for tools to help understanding parallel programming paradigms. +By extending Scheme to be multithreaded, we wanted to create such a tool.
+

+ +

AVAILABILITY
+

+ +

Galapagos was developed to run under Windows 95, and should work under +Window NT as well. (It uses 32-bit specific code so Win32s is not enough +to run Galapagos). Both binary and source are available at the +homepage:
+

+ +

+http://www.cs.bgu.ac.il/~elad/GALAPAGOS + +

+ + +

+

+
+ [TOP] + [PREV] + [PREV] + [PREV] +
+ + diff --git a/websites/www.cs.bgu.ac.il/~elad/GALAPAGOS/19970806122623/~elad/GALAPAGOS/extensions.html b/websites/www.cs.bgu.ac.il/~elad/GALAPAGOS/19970806122623/~elad/GALAPAGOS/extensions.html new file mode 100644 index 0000000..67d97f1 --- /dev/null +++ b/websites/www.cs.bgu.ac.il/~elad/GALAPAGOS/19970806122623/~elad/GALAPAGOS/extensions.html @@ -0,0 +1,493 @@ + + + + Galapagos - Scheme Extensions + + + + + +
+ [PREV] + [PREV] + [PREV] +
+
+

+ +

SCHEME EXTENSIONS
+

+ + + +

+

+ +

We have extended Scheme in two main +directions: Turtle graphics and multithreading:
+

+ +

The turtle object lives on a board on which it can move and draw. +A turtle can also communicate with the board and "see" colors +or other turtles. Galapagos Scheme provides a set of primitives to create +and manage such turtles and the boards they live on.
+

+ +

A set of additional primitives enable the programmer to create multiple +interpreters that run concurrently. The environment model was extended +to support shared or thread-specific environments, and primitives to handle +multiple environments were also added.
+
+

+ +

THE NEW ENVIRONMENT MODEL
+

+ +

A frame is a table which maps (or binds) names to values. An +environment is a chained list of frames in which the interpreter works. +

+ +

For example the command:

+ +

(define x 7)

+ +

creates a binding between x and the value 7.

+ +

A typical environment looks like this:

+ +

+
+

+
+
+
+Each rectangle denotes a frame and inside it are the bindings it holds. +The rightmost rectangle is the global environment.
+

+ +

When a variable is evaluated, the interpreter first tries to find it +in the current frame. If a suitable binding can't be found, the interpreter +moves to the next frame in the environment and searched for a binding there.
+

+ +

In our example if we write x in the command line we'll get 12 +as the answer because all such computations take place at the global environment. +
+

+ +

A function application is always evaluated with respect to the environment +the in which it was defined. (A function "holds" its environment, +hence the name "closure") This means that if we write

+ +

(define (f) x)

+ +

and then

+ +

(f)

+ +

the result will be

+ +

12.
+
+
+
+
+

+
+

+
+In traditional SCHEME we have only one interpreter running at a time, so +at a given point of calculation there is only one environment. In Galapagos +multiple interpreters can run at the same time, and each of them has its +own environment.
+

+ +

Under Galapagos's environment model, every interpreter works on its +branch of an "environments tree", but can also evaluate an expression +in any other environment in the tree. If two interpreters have a shared +node on the tree, then from that point up (towards the global environment) +all the bindings are the same for the two interpreters. The global environment +is shared by all interpreters. If an interpreter changes the value of some +variable, the binding is changed in all other interpreters that have access +to the frame where the variable was declared. Obviously, caution should +be taken when writing to a shared variable.
+

+ +

As an example, if a user created two new threads, called A and B, and +then evaluated:

+ +

First thread> (define +x 7)

+ +

(define (f) ...)

+ +

Thread A> (define (g) +x)

+ +

Thread B> (define x 4) +

+ +

this is how the environment model would look like:
+

+ +


+

+ +

Now consider what happens when the user evaluates this:

+ +

Thread A> (set! f g) +

+ +


+
+

+ +

Now, evaluating (f) in thread B will call the function defined +in thread A. It will return 12 which is the value of x in f's environment. +If thread A defines a new x (using define), it will affect the result +of subsequent calls to f.
+

+ +

Sharing environments and frames are Galapagos's way of allowing shared +data. By default, however, most calculations are done at thread-specific +frames. (More on this subject in the next section). Primitives are supplied +to explicitly reference and manage environments: clone-environment +can create a copy of an environment (so changing a binding in one copy +does not alter the other); extend-environment and pop-environment +can add and remove frames to and from environments. More environment functions +are found in the next section of this document.
+

+ +

THREADS
+

+ +

A thread is a SCHEME interpreter. The base environment of a thread +is the thread's topmost environment. All forms entered at the thread's +console or as arguments to new-thread are evaluated in the base +environment. In traditional SCHEME there is only one thread of execution. +It is a single thread and its base environment is the global environment. +In Galapagos many interpreters can run concurrently, and each have its +own environment (changing dynamically as computation progresses) and a +base environment (which can be explicitly changed).
+

+ +

One thread is created by Galapagos upon startup. It is called the main +thread, and it lasts for the whole Galapagos session. Its base environment +is the global one - much like a traditional Scheme interpreter. Additional +threads can be created using new-thread. These have their base environment +set to a new environment, containing a single fresh frame pointing to the +global environment. Any calculation done at the new thread's console takes +place in this thread-local environment. However, if closure functions are +used, then their evaluation may take place at the global environment or +at some other thread's space, depending on where that function was defined. +
+

+ +

When a thread finishes the execution of its commands it terminates. +There are two exceptions to this rule:

+ +
    +
  1. The main thread can be only terminated by using quit-program. +
    2. + +
  2. A thread that is bound to the console will not terminate at the end +of execution but will wait for the next command input.
    3. +
+ +

Threads can communicate using the predicate tell-thread or by +using the asynchronous message-queues system described later. In addition, +SCM's arbiters were improved to be multithread safe. An arbiter +object can serve as a guard on a critical section (where only one thread +can work at a given time) of the program. The relevant primitves are make-arbiter, +try-arbiter, and release-arbiter.
+

+ +

Note: Galapagos supports Scheme's notation of continuations. +However, two restrictions apply:

+ +
    +
  1. Only "cheap" continuations are supported. That is, a continuation +can only be called when it is still active. This allows for continuations +to be used to implement exception handling, etc.
    2. + +
  2. Continuations can not cross thread boundaries. Also continuations, +like any other Scheme object, can be handled by any thread, they can only +be called from within the thread that created them. Trying to call a continuation +from a different thread will cause an error.
    3. +
+ +

CONSOLES
+

+ +

A console is a text window where the user can type commands (when +the interpreter is idle) and see output. A console has a name which can +be changed dynamically, which appears on its title bar. A thread may or +may not be bound to a console. Information printed by a non-bound thread +is lost; a non-bound thread waiting for input is stuck (unless provisions +were made to allow a new console to be created by means of inter-thread +communications.) If a non-bound thread has nothing to do, instead of waiting +for input like a bound thread, it will terminate.
+

+ +

The main thread is always bound to a console. To bind a thread to a +console use the command bind-to-console from within the thread.
+

+ +

DRAWING BOARDS
+

+ +

A board (window) is the graphical board on which the turtles and the +user draw. It is a bitmap on which the user can draw interactively, by +using the supplied GUI, or by creating turtles and instructing them to +do the drawings.
+

+ +

The controls of the graphical user interface are located on the toolbar. +The "shapes" of drawing are either a rectangle, a line or free +hand drawing. The user pen can have three widths which are found under +the User Pen menu. The numbers next to the sizes are the widths +in pixels.
+

+ +

The colors of the user pen can be changes either from the User Pen +menu or from the toolbar's color buttons. When choosing from a toolbar +button, the user can know exactly what color (in RGB format) is used.
+

+ +

Each window has a name which is written on its title bar which can be +changed using the rename-window! command. The board can be cleaned +from all drawings using the clear-window command.
+

+ +

Since the board is a bitmap it can be saved to a BMP file using the +save-bitmap command. A new background from a bitmap file can be +loaded using the load-bitmap command.
+

+ +

TURTLES
+

+ +

A turtle is an object which is connected to a certain board. Each turtle +has a pen with which it can draw on that board. The user can change the +state of the turtle's pen including giving it the color of the board's +background color (using the pen-erase! command). The pen will draw +when it is "down" and will not draw when it is "up". +Turtles can move between boards using the move-turtle-to-window +command.
+

+ +

Each turtle holds its location as the a pair of coordinates where 0,0 +is the upper left corner of the board and 800,600 is the bottom-right corner +of the board. The turtle's location can be changed by giving the turtle +commands such as forward!, backwards!, move-to! or by using the +move button from the toolbar.
+

+ +

A turtle also has a heading which is the direction it will move on the +forward! command. The heading is in degrees, 0 meaning upwards and +increasing clockwise, thus 90 means rightwards and so on. A turtle's heading +can be changed by commands such as right!, left!, and set-heading! +or interactively, by using the move button on the toolbar and pressing +the control key.
+

+ +

A turtle can be visible on the board or be hidden. When it is visible +the user can decide if it wants a "solid" or "hollow" +turtle using the make-hollow! and make-solid! commands.
+

+ +

A turtle is always connected to a certain board, which is the board +it is drawing on. To create a new turtle on a board use the make-turtle +or the clone-turtle commands. A new turtle (created with the make-turtle +command) will be black, solid, heading north and with it's pen down, in +the center of the board. A cloned turtle will have exactly the same inner +state as its parent.
+

+ +

A turtle can also look at the board and see other turtles or colors. +By using the command look the user can tell the turtle the area +in which to look and what to look in this area.

+ +

Example:

+ +

The command

+ +

(look t 50 20 '(0 0 0))

+ +

will cause the turtle t to look for black pixels in the area +in radius 50 from the turtle and 20 degrees to each side of the heading +line, shown here in blue:

+ +


+

+ +

INTERRUPTS (NOTIFICATIONS) +AND MESSAGE HANDLERS
+

+ +

A turtle can have interrupts. Each interrupt is defined in terms of +turtle's vision. Whenever a turtle starts or stops seeing a given target, +a predefined message is sent to the thread which asked the interrupt. The +user can determine if the interrupt will notify on every change (like a +"can see"- "can't see" toggle) or only when one change +happens (only "can see" or "can't see" toggle). A message +can be any valid SCHEME object.
+

+ +

Example:

+ +

The command

+ +

(turtle-notify t "I-see" "I-don't-see" 50 20 +color-black)

+ +

tells the turtle t that every time it sees the color black it +should send the message "I-see" and when it doesn't see +the color black any more it should send the message "I-don't-see". +

+ +

Below is an example of what messages (or no message) t will send +while it is moving forward, encountering two black lines on its way:
+
+
+

+ +


+
+If the interrupt was of kind "can see" (notify-when command) +only the "I-see" messages were sent, and if it was a the +"can't see" interrupt (notify-when-not command) only the +"I-can't-see" style messages were sent.
+

+ +

A special "user interrupt" is invoked when the user right-clicks +the turtle or a window. The notify-on-click command is used to enable +this.
+

+ +

A thread can tell the turtle to delete a certain interrupt using the +turtle-no-notify command. It can also tell the turtle to disable +all interrupts using the stop-notifying command.
+

+ +

In order to process the messages sent from a turtle's interrupt (or +from another thread, as presented later) the thread must install a message +handler which is a one argument function. If no handler is installed +the turtle's messages are lost. There can be only one handler per thread. +If the handler is installed then every time an interrupt is invoked, the +handler function in called with the message sent by the interrupt as its +argument.
+
+

+ +

Example:

+ +

We declare the function:

+ +

(define (my-print x) (write x) (newline))

+ +

and then install my-print as the current handler with:

+ +

(install-handler my-print)

+ +

from now on every message a turtle's interrupt sends will be printed +on screen. If my-print was installed in the previous example then +we would have seen:
+

+ +

"I-see"

+ +

"I-don't-see"

+ +

"I-see"
+

+ +

on the screen.
+

+ +

A good example to view the interrupts in action is to make a turtle +turn each time it sees a color and then let it wander aimlessly. Then use +the user pen to draw lines the turtle's way and watch it change direction. +See the PINGPONG.SCM file for a demo program.
+

+ +

The message-handler concept can be used as a mean of synchronous inter-thread +communications. The tell-thread functions sends a message to a thread, +which will be treated as an interrupt-generated message: It will cause +the thread's message handler function to be called with tell-thread's argument +as its own. This allows one thread to initiate a computation in a different +thread's environment and CPU space synchronously and without sharing environments. +
+

+ +

MESSAGE QUEUES
+

+ +

In order to let threads communicate between themselves asynchronously +a system of message queues was developed. A queue is an object which stores +and relieves messages, stored in FIFO (First In First Out) style, meaning +messages are read in the order of arrival to the queue. Supported messages +are pairs of type and body, both of which can be any valid SCHEME object. +Looking for messages of a certain type is also supported, allowing implementation +of more flexible communication schemes than plain FIFO.
+

+ +

A thread can check if there are any messages in a given queue, if it +does get-message without checking first if there are messages in +the queue it will wait a given time-out or forever if no time-out is given. +If by the end of the time-out no message were in the queue the result will +be false.
+

+ +

Example:

+ +

In this example a queue q is created then a message is posted +into the queue and read from it.
+

+ +

(define q (make-queue))

+ +

(post-message q (cons 'type-circus 'bozo-the-clown))

+ +

(define msg (get-message q))
+

+ +

now the command

+ +

(car msg)

+ +

will give

+ +

type-circus

+ +

and the command

+ +

(cdr msg)

+ +

will yield

+ +

bozo-the-clown.

+ + +

+

+
+ [TOP] + [PREV] + [PREV] + [PREV] +
+ + + + + + diff --git a/websites/www.cs.bgu.ac.il/~elad/GALAPAGOS/19970806122632/~elad/GALAPAGOS/gui.html b/websites/www.cs.bgu.ac.il/~elad/GALAPAGOS/19970806122632/~elad/GALAPAGOS/gui.html new file mode 100644 index 0000000..a6c0244 --- /dev/null +++ b/websites/www.cs.bgu.ac.il/~elad/GALAPAGOS/19970806122632/~elad/GALAPAGOS/gui.html @@ -0,0 +1,73 @@ + + + + Galapago - GUI + + + + + +
+ [PREV] + [PREV] + [PREV] +
+
+

+ +

THE INTERACTIVE GUI

+
+

In order to make Galapagos more fun to learn with, an interactive GUI +(Graphical User Interface) is provided. Users can make changes on the board +while a computation is in progress and effect its execution. Drawing tools +enable the user to draw on the board while a program is being executed. +If a line is drawn in front of a turtle which has a relevant interrupt, +the interrupt will be invoked if needed.
+

+ +

The user has a special user pen that can draw line, rectangles +or free hand. These modes are available from the toolbar. The User's pen +width and color can be modified using the User Pen menu or the toolbar.
+

+ +

Color buttons are provided on the toolbar to give a known RGB color +to the user pen. It is useful when the user draw an object on the board +and wants a turtle to see this object. The colors are:

+ +

White - (255 255 255)

+ +

Black - (0 0 0)

+ +

Blue - (0 0 255)

+ +

Red - (255 0 0)

+ +

Green - (0 255 0)

+ +

Yellow - (255 255 0)
+

+ +

Another option available is changing a turtle's heading and position, +using the Move Turtle button:

+ +


+

+ +

If this button is pressed then a turtle can be dragged to a new location +simply by dragging it with the mouse. In order to change the turtle's heading, +hold down a control key and move the move towards the desired location, +the turtle will follow the movement of the mouse.

+ +

+

+
+ [TOP] + [PREV] + [PREV] + [PREV] +
+ + + + + diff --git a/websites/www.cs.bgu.ac.il/~elad/GALAPAGOS/19970806122650/~elad/GALAPAGOS/implementation.html b/websites/www.cs.bgu.ac.il/~elad/GALAPAGOS/19970806122650/~elad/GALAPAGOS/implementation.html new file mode 100644 index 0000000..822f9b9 --- /dev/null +++ b/websites/www.cs.bgu.ac.il/~elad/GALAPAGOS/19970806122650/~elad/GALAPAGOS/implementation.html @@ -0,0 +1,393 @@ + + + + Galapagos - Implementation + + + + + +
+ [PREV] + [PREV] + [PREV] +
+
+

+ +

IMPLEMENTATION

+ + + +
+

Galapagos was written using Microsoft Visual C++, and is designed to +run under Windows 95. We chose Windows 95 because it seems to have the +largest potential Galapagos users base. The following sections describe +some implementation details of Galapagos.
+

+ +

The SCM interpreter we used as a base is written in C. Most of the original +code we added was written in C++. The parts we used from SCM are almost +identical to the original. In fact, by changing the scmconfig.h file (which +contain machine-specific configuration) and #defining THREAD to be null, +the C files should become equivalent to the sources we used.
+

+ +

We have implemented two MT-safe FIFO message queue classes. Both will +block when trying to read from an empty queue. CMsgQx, the extended +message queue, supports the same interface as the one provided in Scheme, +plus an additional support for "Urgent Messages". These take +precedence over all other messages. CMessageQueue is message queue +with exactly the same interface as the Scheme level message queues, but +which contain internal logic to handle "Urgent" messages used +to deal with cases where synchronous respond is needed, such as I/O, Garbage +collection, and Scheme-level inter-thread communications.
+

+ +

FITTING SCM INTO WINDOWS
+

+ +

Galapagos is based on SCM, which is a single-thread, read-evaluate-print-loop +(repl) based Scheme interpreter. The most important issue in migrating +SCM was how to maintain the interpreter's natural repl-based approach, +yet allow for multiple threads to interact, and for Windows messages to +be processed quickly.
+

+ +

We used WIN32's multithreading capabilities to solve these problems. +A single thread handles all aspects of the GUI - in a sense, "all +that is Windows": graphic boards, turtles, consoles, menus and so +on. Each interpreter runs in a thread of its own, interacting with the +GUI using a message queue similar to the one provided at the Scheme level.
+

+ +


+

+ +

The GUI thread manages both commands received from the OS and from the +different interpreters running on their own threads. To ensure as fast +responses as possible, priorities are used: OS messages (such as windows +updates and input devices) gets highest priority; Console (text messages) +come second, and graphics messages are last. This allows the interpreters +to run interactively in a satisfactory manner.
+

+ +

SCM interpreter threads each run in the old-fashion repl mode. When +a computation is over, the interpreter blocks until new input comes from +the GUI thread. All blocking functions were modified to allow synchronous +messages (such as the one generated by tell-thread) to work. In +addition, SCM's "poll routine" is used to force checking for +such messages even during computations.
+

+ +

An additional thread is used for Garbage Collection. It is described +in detail in the section dealing with garbage collection.
+

+ +

GARBAGE COLLECTION

+ +

In this section we will briefly describe SCM's garbage collector, and +then discuss the modifications done to adapt it to Galapagos's multithreading +computations. It should be noted that the garbage collector used is a portable +garbage collector taken from "SCHEME IN ONE DEFUN, BUT IN C THIS TIME", +by George J Carrette <gjc@world.std.com>.
+

+ +

SCM uses a conservative Mark & Sweep garbage collector (GC). All +Scheme data objects share some common configuration (called "cells"): +They are 8-byte aligned; they reside is specially-allocated memory segments +(called hplims); they are the size of two pointers (so a scheme cons is +exactly a cell); and they contain a special GC bit used by the garbage +collector. This bit is 0 during actual computations. When a new cell is +needed and all the hplims are used, garbage collection is initiated. If +it does not free enough space to pass a certain threshold, a new hplim +is allocated.
+

+ +

The first stage in garbage collection is marking all cells which are +not to be deleted. Some terminology might be helpful here:
+

+ +
    +
  • A cell (or any data object) is called alive if it may +in some way influence the future of the computation. Needless to say, discovering +which cells are alive and which are not is impossible, because of the very +nature of the future.
    • +
+ +
    +
  • A cell is called reachable if the computation can read +its value. Some data is immediately reachable: The data on the machine's +stack or in the CPU registers, for example; some interpreters store some +information in a fixed location so it's permanently reachable. In SCM the +array sys_protects[] is used for +this propose. The set of reachable cells is the union of all immediately +reachable cells, and all those cells pointed by reachable cells, recursively. +
    • +
+ +

Obviously, all unreachable data is dead. Conservative garbage collectors +treat all reachable data as alive.
+

+ +

The Mark stage of the garbage collector scans the sys_protects[] +array and the machine's stack and registers for anything that looks like +a valid cell. All cell pointer have their 3 least significant bits zero, +and are in one of few known ranges (the hplims). The garbage collector +searches for anything matching a cell's bit pattern, and treats it as an +immediately reachable cell pointer. In some cases, this may mean an integer, +for example, happens to match the binary pattern and thus be interpreted +as a cell pointer. However, this will only mean some cell or cells are +marked as reachable though they are not such. Because of the uniform structure +of the cell and its limited range of possible locations, such an accident +is guarantied not to corrupt memory. Furthermore, if we accept the assumption +that integers are usually relatively small, and memory addresses are relatively +big, we conclude that such accidents are not very likely to happen often +anyway.
+

+ +

During mark stage, the garbage collector recursively finds (a superset +of) all live cells, and marks them by setting their special GC bit to 1. +The second stage is the Sweep stage, in which all the hplims are scanned +linearly, and every cell which is not marked is recognized as dead, and +as such is reclaimed as free. Marked cells get unmarked so they are ready +for the next garbage collection.
+

+ +

Mark & Sweep garbage collection has two main disadvantages: One, +that it requires all computation to stop while garbage collection is in +progress. In Galapagos, since all threads use a shared memory heap, it +means all threads must synchronize and halt while garbage is collected. +Second, Mark & Sweep is very likely to cause memory fragmentation. +However, since cells are equally sized, fragmentation is only rarely a +problem.
+

+ +

We chose to stick with Mark & Sweep in Galapagos because of its +two major advantages: Simplicity and efficiency. Mark & Sweep GC does +not affect computation speed, because direct pointers are used. Most concurrent +garbage collectors work by making all pointers indirect, which may slow +computations down considerably. The need to halt all threads for GC is +accepted. Since memory is shared, it would only be fair to stop all threads +when GC is needed: Threads will probably halt anyway since cells are allocated +continuously during computations.
+

+ +

Two major issues are introduced when trying to multithread the garbage +collector. One is the synchronization of the different threads, which run +almost completely unaware one of the other; the second is the need to mark +data from every thread's specific stack, registers, and sys_protects[]. +We solved these two issues by combining them to one.
+

+ +

The intuitive approach might be to let each thread mark its own information, +and then sweep centrally. However, since synchronization of threads is +mandatory, letting every thread mark its own data will lead only to redundant +marking and to excessive context switches, since each threads has to become +active. Therefore we created the "Garbage Collection daemon" +(GCd), which runs in a distinct thread and lasts for the whole Galapagos +session. The GCd is not an interpreter, but a mechanism which keeps track +of live threads and their need of GC. The GCd thread is always blocked, +except when a thread notifies it on its birth or death, or when a thread +indicates the need for garbage collection. Since the GC daemon is blocked +whenever it is not needed, and then becomes the exclusive running thread +during actual GC (with the exception of the GUI thread), its existence +does not hurt performance.
+

+ +

To explain how the GCd synchronizes all threads, let us examine the +three-way protocol involved. freelist +is a global pointer which holds a linked list of free cells - it can be +either a cell pointer, a value indicating "busy" (thus implementing +busy/wait protection over it) or "end of memory" which is found +at the end of the linked list. MIB stands for Memory Information +Block, which is a block of memory containing all of a thread's +immediately reachable data.
+

+ +

GCd scenario: GCd is blocked until a threads sends a GC +request.

+ +
    +
  1. GCd scans through its list of active threads, and sends each a MIB +request.
    2. + +
  2. It then blocks until all MIB blocks are received. GCd ignores further +GC request messages it get.
    3. + +
  3. At this point all threads are blocked. The GCd has gained, therefore, +exclusive access to the hplims. The GCd now marks all reachable cells, +inspecting each MIB block for immediately reachable cells and proceeding +recursively. Then, it sweeps.
    4. + +
  4. If needed, the GCd allocated a fresh hplim.
    5. + +
  5. GCd sends every thread a message allowing it to resume. Then it blocks +waiting for the next time.
    6. +
+ +

Scenario 1: A thread needs to allocate a cell but can't. +

+ +
    +
  1. The thread sends GCd a GC request message.
    2. + +
  2. Then it suspends until GCd sends it an MIB request.
    3. + +
  3. When one arrives, the thread generates and sends a MIB block to the +GCd.
    4. + +
  4. And blocks again until GCd notifies it that GC is done.
    5. + +
  5. At this point free cells are available and the computation can resume. +
    6. +
+ +

Scenario 2: A thread receives a MIB request. This +may happen within a computation or when considered otherwise blocked - +waiting for input, for example.

+ +
    +
  1. The thread generates and sends a MIB block to the GCd.
    2. + +
  2. And blocks until GCd notifies it that GC is done.
    3. +
+ +

The important thing to note about this protocol is its indifference +to the GC "initiator". Several threads can "initiate" +GC, and each request is "satisfied", although of course only +one GC takes place. The GCd itself is unaware of the initiating thread +identity, and completely ignores any further GC requests. It treats all +threads identically. This is important because it allows each thread meeting +a low memory condition to initiate GC immediately. This is in fact the +mechanism which saves us from explicitly checking for a third-party GC +request during computation: If a thread runs out of memory, the freelist +variable is kept at "out of memory" state, causing any other +thread trying to allocate memory to initiate GC as well. This simplifies +the GC protocol (technically, if not conceptually), and does it with almost +no affect on computation speed.
+

+ +

BOARDS
+

+ +

A board or a view as it called in MFC is the environment where a turtle +moves and interact with. It hold two main data structures. The first is +the bitmap of the drawing. It is a 800X600 bitmap. Every time a turtle +draws on the board it makes its pen the active pen on the board and draws +on it. Every time the picture needs refreshing (as signaled by the operating +system) it is the board's duty to copy the relevant section from the bitmap +to the screen. The second data object is the turtles list, an expandable +array of turtles which holds pointers to all turtles on the specific board.
+

+ +

The most important part in the board's work is to notify the turtles +on any event that happened on the board such as drawing, changing background +or moving of a turtle. If for example a user draws a line on the board, +the board (after drawing the line) goes through the turtles list and tell +each one that some event happened at a rectangle that contains the line. +Each turtle will decide if this has any importance to it or not.
+

+ +

Apart from that, the board handles all the user interface from the menus +and the toolbar. The most obvious example is the move turtle button, which, +when pressed, causes the board to find a turtle close enough to the click's +location. Then, on every movement of the mouse it gives the turtle a command +to move to this point.
+

+ +

In order to support scrolling of the picture, we derived the CBoardView +class from CScrollView. The interface with the interpreter threads +is done via a message queue. The main function is ReadAndEval, +which gets a message and then interprets its and act upon the result.
+

+ +

TURTLES
+

+ +

In addition to a pointer to its current board, and to inner-state variable +which affects its graphical aspects, every turtle holds an expandable array +of interrupts. When a turtle gets from the window that a message signifying +that some change has happened, it sends this change to each of its interrupts +(only if the interrupt flag is on) and the interrupt is responsible to +send an appropriate message if necessary. The turtle's location are stored +as floating points on x,y axes, to allow for accuracy on the turtle's location +and heading.
+

+ +

The turtles interacts with the interpreter thread using a message queue. +As with the board, the main function here is the ReadAndEval, +which translates these messages to valid function calls.
+

+ +

VISION
+

+ +

Every turtle holds a pointer to the bitmap it is drawing on. When it +is "looking" for a color it calculates the minimal rectangle +that holds the desired area. Then it iterates on all the pixels in this +rectangle. First it checks if the pixel is in the vision area using the +sign rule to determine if a point is clockwise or anti clockwise from a +line, and then check for distance. If the point is in the relevant area +the turtle gets its color from the bitmap and compares it with the sought +color.
+

+ +

When looking for a specific turtle, the turtle gets this turtle's position +and calculates if this location is in the relevant area using the same +algorithm. When looking for any turtle, the turtle passes the relevant +arguments to the view, which then uses the same algorithm for each turtle +on its turtles array.
+

+ +

INTERRUPTS
+

+ +

Each turtle holds an expandable array of interrupts. Each interrupts +is an object that is much like a turtle vision. The interrupts has the +view area argument and what it is looking for. It also has the message +it needs to send and a pointer to the given queue. When the turtle notifies +the interrupt that a change has happened, the interrupt first checks if +the change is an area which is of interest to it. If so it calls the turtle +look function with its location and the sought object. According to the +turtle's answer and to the data stored inside the interrupt, the interrupt +sends the needed message, if any.
+
+

+ +

CLASS ORGANIZATION
+

+ +


+
+

+ +

Message-passing mechanisms:
+

+ +

+

+ + + +

+

+
+ [TOP] + [PREV] + [PREV] + [PREV] +
+ + + + + + diff --git a/websites/www.cs.bgu.ac.il/~elad/GALAPAGOS/19970806122731/~elad/GALAPAGOS/manual.html b/websites/www.cs.bgu.ac.il/~elad/GALAPAGOS/19970806122731/~elad/GALAPAGOS/manual.html new file mode 100644 index 0000000..030d010 --- /dev/null +++ b/websites/www.cs.bgu.ac.il/~elad/GALAPAGOS/19970806122731/~elad/GALAPAGOS/manual.html @@ -0,0 +1,1404 @@ + + + + Galapagos - Programmer's Manual + + + + + +
+ [PREV] + [PREV] + [PREV] +
+
+

+ +

PROGRAMMER'S MANUAL:
+NONSTANDARD PRIMITIVES

+ + + +

+

+ +

Welcome to Galapagos Scheme. This chapter is intended +as a quick reference to Galapagos's extensions over traditional Scheme. +Knowledge of Scheme is assumed. Galapagos Scheme is compliant with both +R4RS and IEEE standard P1178. If you've read the chapter titled +"Scheme extensions", you can and should skip the short introduction +in each section. This complete chapter appears as on-line help in Galapagos, +just a F1 click away.
+

+ +

+

+ +

ENVIRONMENTS
+

+ +

An environment is a list of frames, +with the global environment in its tail. A frame is a list +of bindings, which map variables to their values. (define...) +adds a binding to the frame at the top of the current environment. +(set!...) family of commands modify +an existing binding, in the frame where it was defined. When a variable +is referenced, the current environment is searched from head to tail, and +the first binding found dictates the value of the variable.

+ +

The first interpreter, which pops up as Galapagos +is started, runs at the global environment (the way traditional Scheme +works). Additional interpreters (threads) run at distinct environments, +which contain a single initially empty frame, and a pointer to the global +environment.
+
+

+ +

(clone-environment +env [depth])
+

+ +

Clone-environment will make an exact copy of the +environment env, by copying its frames +one by one. If depth is specified then the new environment will be the +collection of frames which is up to depth +frames from the current frame. And the last frame will point to the depth ++ 1 frames from the current one in env. +
+

+ +

This means that if we are now in environment e1 +and done (define x 7). Then if we'll +write

+ +

(define e2 (clone-environment +(current-environment))),

+ +

the result of

+ +

(eval@ e2 x) +

+ +

will return 7.
+

+ +

But if we are not in a lower frame than the one +x was defined in and write

+ +

(define e2 (clone-environment +(current-environment) 1))

+ +

and write the value of x is undefined.

+ +

(Unless it was defined in the global environment) +
+

+ +

Note: Only the bindings are copied. The bound values +are not. Example:

+ +

(define x (cons 1 2)) +

+ +

(define e (clone-environment +(current-environment)))

+ +

(eval@ e (set-cdr! X 6)) +

+ +

will change the 2 into 6 at both environments. +However,

+ +

(set! x 7) +

+ +

will only affect one copy.
+

+ +

(pop-environment +env)
+

+ +

Returns the current environment without the first +frame. This means the first frame on the list of frames is "popped" +out.

+ +

If env was +made from f3->f2->f1->Global, the result will be f2->f1->Global. +

+ +

(fx means frame number x)

+ +

Example:

+ +

(define e2 (pop-environment +(current-environment)))
+

+ +

(extend-environment +env)
+

+ +

Extends env with +a new empty frame (where nothing is defined yet).

+ +

This means the if env +was f2->f1->Global the result will be f3->f2->f1->Global. +

+ +

(fx means frame number x)

+ +

Example:

+ +

(define e2 (extend-environment +(current-environment)))
+

+ +

(current-environment) +
+

+ +

Returns the current environment.
+

+ +

(environment? +env)
+

+ +

A predicate that is true if env +is an environment.

+ +

Example:

+ +

(environment? (current-environment)) +

+ +

Will return true.
+

+ +

(parent-environment) +
+

+ +

Returns the parent environment. This is the environment +where (new-thread) was called to create +this thread. The First thread returns the global environment.

+ +

Example:

+ +

(eval@ (parent-environment) +y)

+ +

Will return the value of y in the parent environment.
+

+ +

(base-environment) +
+

+ +

The environment where the interpreter runs.
+

+ +

(set-base-environment +env)
+

+ +

Sets the base environment (where the interpreter +runs) to be env

+ +

Example:

+ +

(set-base-environment +(parent-environment))

+ +

Will make this thread run in the same environment +as its father)
+

+ +

(eval@ env forms...) +
+

+ +

Evaluates forms in given environment.

+ +

Example:

+ +

(define x 7) +

+ +

(define e2 (clone-environment +(current-environment)))

+ +

(eval@ e2 x)
+

+ +

The result will be 7
+

+ +

(eval@p forms...) +
+

+ +

Evaluates forms in parent environment.

+ +

Example:

+ +

Say we want to make our turtle walk 30 degrees +more than the father's turtle. Then we can write:

+ +

(set-heading! T (+ 30 +(eval@p (turtle-heading t))))
+

+ +

MESSAGE QUEUES
+

+ +

Message queues are MT-safe mechanisms used to pass +messages, possibly between threads. Messages accepted must be cons, its +car being the message type and the cdr is the message body. Both can be +any kind of Scheme object.
+
+

+ +

(make-queue) +

+ +

Creates a new message queue.

+ +

Example:

+ +

(define q (make-queue)) +
+

+ +

(message-queue? +q)

+ +

A predicate that is true if q +is a queue.

+ +

Example:

+ +

(message-queue? q)

+ +

Will return true for q from the previous example.
+

+ +

(peek-message +q [type])
+

+ +

Return true if there is a message (of given type, +or of any type if unspecified) in the queue q. +

+ +

Example:

+ +

(peek-message q) +

+ +

Will return falsif the queue q is empty. +

+ +

Note: types are compared using (equals?) +.
+

+ +

(post-message +q typ_msg)
+

+ +

Posts the message typ_msg +to the queue q.

+ +

typ_msg must +be a cons (type . message).

+ +

Example:

+ +

(post-message q (cons +'type-welcome 'hello))
+

+ +

(get-message [time-out] +q [type])
+

+ +

Get message from queue q +, if time-out is defined +waits only time-out seconds, and

+ +

optionally gets only messages from type type. +

+ +

Example:

+ +

(define msg (get-message +7 q 'type-welcome))

+ +

The result will be (if the previous posting was +done) ('type-welcome . 'hello)

+ +

Note: types are compared using (equals?) +.
+

+ +

WINDOW COMMANDS
+
+

+ +

A window is the graphical board on which the turtles +and the user draw. It is a bitmap of size 800x600.
+
+

+ +

(new-window [name]) +
+

+ +

Makes a new window, name +is a symbol or a string which will also be the window's title. The window's +color will be white and it's size 800x600.

+ +

Example:

+ +

(define w (new-window +'my-window))

+ +

Will create a new window with the title my-window. +
+

+ +

(rename-window! +win [name])
+

+ +

Renames the window win. name +is a symbol or a string which will also be the window's title.

+ +

Example:

+ +

(rename-window! w 'foo) +

+ +

Will make the title of w to be foo.
+

+ +

(set-background-color! +R G B)
+

+ +

Set the background color of the window. All the +turtles in the window are notified on the new color (used in pen-erase) +

+ +

The colors are defined in terms of Red +Green Blue +(where 0,0,0 is black and 255,255,255 is white).

+ +

Example:

+ +

(set-background-color! +w 255 255 0)

+ +

Will turn the background color of w +to yellow
+

+ +

(clear-window +w)
+

+ +

Clears the screen from all the previous drawings, +leaving only the turtles images on it.

+ +

Example:

+ +

(clear-window w)
+

+ +

(load-bitmap w +"filename" [x y])
+

+ +

Loads the bitmap "filename" +and makes it the background of w. x y are +the coordinates of the upper left corner of the picture. If x +y are not given then the picture is centered.

+ +

Example:

+ +

(load-bitmap w "c:\\windows\\forest.bmp") +
+

+ +

This operation can also be done using the Board +menu.
+
+

+ +

(save-bitmap w +"filename")
+

+ +

Saves the window into a bitmap file called "filename". +

+ +

Example:

+ +

(save-bitmap w "my_draw.bmp") +
+

+ +

This operation can also be done using the Board +menu.
+

+ +

(window-alive? +win)
+

+ +

True if win +is alive, meaning it can get commands.
+

+ +

(window-name w) +

+ +

Returns the name of w. +

+ +

Example:

+ +

(window-name w) +

+ +

Will return "foo" on our window.
+

+ +

TURTLE COMMANDS

+ +

A turtle is an object which is connected to a certain +window. It has inner state variables:
+

+ +

- width: the width +of the pen.

+ +

- heading: the direction +the turtle will go on command forward!. +The heading is in degrees where 0 is upwards and adding to the heading +means clock wise rotation.

+ +

- visibility: if the +body of the turtle is visible on the board or not.

+ +

- solid: if the turtle +is a "solid" turtle (its interior is also drawn) or "hollow" +one (only its circumference is drawn).

+ +

- position: the location +of the turtle on the board, where 0,0 is the upper left corner. +

+ +

- color: the color +of the turtle and it's pen, given in RGB format.

+ +

- pen condition: the +turtle's pen can be in three states:

+ + + +

- pen width: the width +of the pen, the bigger the width the thicker the pen will be.
+

+ +

Turtles can also "see" the board or other +turtles (only from the same board) and can handle user interrupts. A turtle +is always connected to a certain view, which is the view it is drawing +on. Turtles can move between views.
+
+

+ +

(make-turtle win +[name])
+

+ +

Creates and return a new turtle, in window win, +optional name (where name can be anything). +

+ +

The inner state of the new turtle will be: +

+ + + +

Example:

+ +

(define t (make-turtle +'turty))
+

+ +

(turtle-alive? +t)
+

+ +

A predicate that is true if t +is alive, meaning t can get commands. +

+ +

Example:

+ +

(turtle-alive? t)

+ +

Will return true on our t.
+

+ +

(clone-turtle +t [name])
+

+ +

Creates an identical turtle to t +(same inner state).

+ +

Example:

+ +

(define t2 (clone-turtle +t))
+

+ +

(rename-turtle +t [name])
+

+ +

Renames the turtle, name is a string or a symbol +

+ +

Example:

+ +

(rename-turtle t 'pongy) +
+

+ +

(turtle-name t) +
+

+ +

Returns the name of t. +

+ +

Example:

+ +

(turtle-name t) +

+ +

Will return "pongy" on our t.
+

+ +

(forward! t d)
+

+ +

Makes t go +forward (in the heading of t) +d steps. +t will draw while going according to +the state of it's pen.

+ +

Example:

+ +

(forward! t 100) +

+ +

Will cause t +to go forward 100 steps. (In our case since t's +heading hasn't changed it will go upwards)
+

+ +

(turtle-width! +t n)

+ +

Set the width of t's +pen to be n. The bigger n +is the wider the pen will be.
+

+ +

(backwards! t +d)
+

+ +

Same as forward, just in the opposite direction. +

+ +

Example:

+ +

(backwards! t 100) +

+ +

is the same as

+ +

(forward! t -100)
+

+ +

(right! t d)
+

+ +

Will set a new heading to t. +The new heading is the old heading plus d, meaning +t will rotate clock-wise.

+ +

Example:

+ +

(right! t 90) +

+ +

Will make t +turn 90 degrees to the
+

+ +

(left! t d) +

+ +

Same as right, other direction
+

+ +

(set-heading! +t val)
+

+ +

Sets the heading of t +to be val. 0 is upwards and 90 is to +the right.

+ +

Example:

+ +

(set-heading t 180) +

+ +

Will cause t +to point to the bottom of the screen.
+

+ +

(move-to! t x +y)
+

+ +

Makes t move +to point x,y without painting. 0,0 +is the top-left corner of the window.

+ +

Example:

+ +

(move-to! T 100 100) +

+ +

Will cause t +to move to point 100,100.
+

+ +

(draw-to! t x +y)
+

+ +

Moves t to +x,y possibly drawing or erasing according +to the state of t's pen.

+ +

Example:

+ +

(draw-to! t 0 0)
+

+ +

(move-turtle-to-window +t win)

+ +

Move t to the +window win

+ +

Example:

+ +

(move-turtle-to-window +t w)
+

+ +

(pen-up! t)
+

+ +

The pen of t +is up, so he won't paint when moving.

+ +

Example:

+ +

(pen-up! t)
+

+ +

(pen-down! t)
+

+ +

Causes t's +pen to be down, meaning he will draw as he is moving.
+

+ +

(pen-erase! t)
+

+ +

Causes t's +pen to be in the same color as the background color of the window it is +attached to.
+

+ +

(show-turtle! +t)
+

+ +

Makes t visible. +Meaning he will be seen on the board.

+ +

Example:

+ +

(show-turtle! t)
+

+ +

(hide-turtle! +t)
+

+ +

Makes t invisible. +Meaning he will not be seen on the board. (but all the drawing he does +will be seen)

+ +

Example:

+ +

(hide-turtle! t)
+

+ +

(make-turtle-solid! +t)
+

+ +

Makes t a solid +turtle.
+

+ +

(make-turtle-hollow! +t)
+

+ +

Make t a "hollow" +turtle.
+

+ +

(kill-turtle! +t)
+

+ +

Kills t. Meaning +it will be erased from the board and will not accept further commands. +

+ +

Note: This is the only way to get rid of a turtle. +

+ +

Example:

+ +

(kill-turtle! t) +

+ +

Will cause when writing t +in the command line to the response

+ +

#<dead turtle>
+

+ +

(set-color! t +R G B) or (set-color! t (list R G B)
+

+ +

Sets t's color +(and it's pen), in RGB format.

+ +

Example:

+ +

(set-color! t 255 0 255) +

+ +

Will cause t +to be pinkish.

+ +

Same as:

+ +

(define pinkish '(255 +0 255))

+ +

(set-color! t pinkish)
+

+ +

(turtle-inner-state +t)
+

+ +

Returns a list of 6 parameters: color, heading, +hidden-flag, pen width, solid flag, location (cons x y))

+ +

Example:

+ +

(define new-t (make-turtle +w))

+ +

(turtle-inner-state new-t) +

+ +

Will return the list

+ +

((0 0 0) 0.0 #f 2 #t (400.0 +. 300.0))
+

+ +

Below are functions that returns only one of the +parameters returned by turtle-inner-state: +
+

+ +

(turtle-color t) +

+ +

(turtle-heading t) +

+ +

(turtle-visible t) +

+ +

(turtle-width t) +

+ +

(turtle-solid? t) +

+ +

(turtle-position t)
+

+ +

TURTLE VISION
+

+ +

A turtle can interact with the board. It can "see" +colors or other turtles.
+
+

+ +

(look t distance +angle '(R G B))
+

+ +

Will return true if there is a point in color (R +G B) in distance distance from +t and in the area bordered by the angle +2*angle.

+ +

Example:

+ +

(look t 50 20 '(0 0 0)) +

+ +

Will cause t +to search for the color black (RGB 0,0,0) in the area shown here in blue:
+

+ +


+

+ +

(look t distance +angle [t1])
+

+ +

Same as if looking for color, just this time it +will be true is t1 is in the visible area.

+ +

If no target turtle is defined then the function +will return true if any turtle from this window is in the visible area. +

+ +

Example:

+ +

(define new-t (clone-turtle +t))

+ +

(forward! new-t 30) +

+ +

(look t 50 20 new-t) +

+ +

And

+ +

(look t 50 20) +

+ +

Will both return true.
+
+

+ +

INTERRUPTS (NOTIFICATIONS) +
+

+ +

A turtle can hold a list of interrupts (or notifications). +When an interrupt is invoked it send a given message to the thread that +sent the command. Every interrupt is defined by a "look" arguments. +An interruptcan be of three kinds:
+

+ +

A "yes" interrupt - The interrupt will +happen (message sent) on every "first" time the look returns +yes.

+ +

Meaning if a turtle is told to invoke an interrupt +every time it sees blue on a certain region. Then the first time it sees +blue it will invoke the interrupt. From now on if the blue is in view it +will not invoke the interrupt. Then if it loses sight of the blue object, +the next time it sees blue again it will invoke the interrupt, and so on.
+

+ +

A "no" interrupt - Same as the "yes" +interrupt, just this time the interrupt is invoked when the sought object +is not seen.
+

+ +

A "both" interrupt - First time the sought +object is viewed the "yes" message is sent, then the first time +the turtle loses sight of the object the "no" message is sent +and so on.

+ +

A message can be any SCHEME object.
+

+ +

When the interpreter is installing interrupt to +a turtle it need to install a handler, which is a function that +takes only one argument and this argument is the messages that comes from +the interrupt.

+ +

If no handler is installed, the messages will be +sent but will have no affect on the thread of execution.

+ +

There can be only one handler per thread and a +handler can not be a primitive procedure.
+

+ +

(turtle-notify +t msg1 msg2 distance angle TARGET)

+ +

Instructs a turtle to send msg1 and msg2 upon seeing +and not seeing, respectively, the target. The messages can be any Scheme +objects, which are sent to the thread as if by (tell-thread). The other +parameters - see (look)

+ +

Example:

+ +

(turtle-notify t 'yes +'no 50 10 new-t)

+ +

This is a "both" kind interrupt.
+

+ +

(turtle-no-notify +t distance angle TARGET)
+

+ +

Tells the turtle to stop notifying in the given +case. Very like deleting the interrupt from the turtle.
+

+ +

(notify-when[-not] +t1 msg dist ang TARGET)
+

+ +

Instructs a turtle to send msg upon [stopping] +seeing the target. This is a "yes" or "no" interrupt. +

+ +

Example:

+ +

(notify-when t 'gotcha +50 10 new-t)

+ +

Will cause t +to send the message "gotcha" every "first" time it +sees new-t.
+

+ +

(stop-notifying +t)
+

+ +

t will temporarily +stop notifying on interrupts. Like "clear interrupts".
+

+ +

(continue-notifying +t)
+

+ +

t will resume +notifying on interrupts.
+

+ +

(no-notifications +t)

+ +

Deletes all t's +interrupts.
+

+ +

(notify-on-click +turtle msg)
+

+ +

Instructs turtle to send msg when right-clicked +with the mouse (distance of 5 pixels from the turtle location). There can +be only one interrupt of this kind per turtle.

+ +

Example:

+ +

(notify-on-click t 'ouch) +

+ +

Will case t +to send the message "ouch" when the user right-clicks next to +it.
+

+ +

(notify-on-click +window msg)
+

+ +

Instructs window to +send msg when right-clicked with the +mouse not close to any turtle.
+

+ +

(clear-notify-click +t)
+

+ +

Clears the user right click interrupt
+

+ +

(install-handler +func)
+

+ +

Installs a message handler. When a message arrives, +func is called with it as a sole argument. +

+ +

There can be only one handler per thread. func +can not be a primitive procedure.

+ +

Example:

+ +

(define (print x) (write +x))

+ +

(notify-on-click t 'click-on-t) +

+ +

(install-handler print) +

+ +

Will cause that the message "click-on-t" +will be printed each time the user right clicked on t. +
+

+ +

THREADS
+

+ +

Galapagos supports multiple threads. Every thread +is a complete Scheme interpreter, with its own base environment. Every +thread has a Thread Object, which uniquely identifies it.
+

+ +

A console is a text window where the user +can type commands (when the interpreter is idle) and see output. A thread +may or may not be bound to a console. Information printed by a non-bound +thread is lost; a non-bound thread waiting for input is stuck (unless provisions +were made to allow a new console to be created by means of inter-thread +communications.) If a non-bound thread has nothing to do, instead of waiting +for input like a bound thread, it will terminate.
+

+ +

(this-thread)
+

+ +

Returns the thread-object of the current thread. +

+ +

Example:

+ +

(this-thread) +

+ +

Will return something like

+ +

#<thread 0x6d1e2c> +
+

+ +

(is-first-thread?) +
+

+ +

True if the current thread is the first SCM thread.
+

+ +

(thread? t) +

+ +

True if t is a thread

+ +

Example:

+ +

(thread? (this-thread)) +

+ +

Will return true
+

+ +

(active-threads) +
+

+ +

Returns the number of active threads
+

+ +

(new-thread form+) +

+ +

Creates a new thread that will calculate the form[s] +

+ +

Example:

+ +

(new-thread (define t +(make-turtle w)) (forward! t 200))

+ +

Will make a new thread that will create a new turtle +and will move it forward 200 steps and then terminates.

+ +

(new-thread (bind-to-console)) +

+ +

Will make a new thread that's ready to accept commands +form a newly-created window. The same can be achieved by selecting "Fork" +from "Scheme" menu.
+
+
+

+ +

(break& form+) +
+

+ +

Causes the current thread to stop and calculate +the form[s]. The current computation is lost.
+

+ +

(bind-to-console) +
+

+ +

The thread will get its commands from a console. +

+ +

Example:

+ +

(new-thread (bind-to-console)) +

+ +

Will create a new thread that gets it.
+

+ +

(unbind-console) +

+ +

Close bound console.
+

+ +

(rename-console +name)

+ +

New name for the current console
+

+ +

(install-handler +func)
+

+ +

Installs a message handler. When a message arrives, +func is called with it as a sole argument. +

+ +

There can be only one handler per thread. func +can not be a primitive procedure.

+ +

Example:

+ +

(define (print x) (write +x))

+ +

(notify-on-click t 'click-on-t) +

+ +

(install-handler print) +

+ +

Will cause that the message "click-on-t" +will be printed each time the user right clicked on t. +

+ +

Note: (new -thread (install-handler +f)) is a bad idea, because the fresh thread will terminate immediately. +
+

+ +

(tell-thread th +x)
+

+ +

Sends message X +to thread th. Returns true on success. +

+ +

If th has no +handler installed it will cause nothing.
+

+ +

(quit-thread)
+

+ +

Kills the current thread, does not work on the +main thread.
+

+ +

(quit-program)
+

+ +

Quits the program.
+
+
+

+ +

These are primitives taken from SCM, which were +modifies to be multithread-safe: + +

+ + +

+An arbiter +is a data object the canbe used as a +guard for critical sections. It can be either "locked" or "unlocked". It +is ideal when a busy/wait mechanism is required, since it is MT-safe. +

+ + +

(sleep n) +

+ +

Causes the current thread to block for (approximately) +n seconds. (sleep 0) is a way to instruct +a thread to give up its remaining processor time.
+

+ + +

(make-arbiter +name)
+

+ +

Makes an arbiter called name. +

+ +

Example:

+ +

(define x-arb (make-arbiter +'x-guard))
+
+

+ +

(try-arbiter arb) +
+

+ +

Checks if the arbiter arb +is up. If the arbiter is up returns false, otherwise it sets +the arbiter to be "up" and returns true.

+ +

Example:

+ +

(try-arbiter x-arb) +

+ +

Will return true and set x-arb +to be "up". But trying it for the second time return false since +x-arb is "up".
+

+ +

(release-arbiter +arb)
+

+ +

Set the arb +to be "down". If the arbiter was "up" returns true +otherwise returns false.

+ +

Example:

+ +

(release-arbiter x-arb) +

+ +

Will return true , but using this function again +will return false since x-arb is already +down.

+ + +

+

+
+ [TOP] + [PREV] + [PREV] + [PREV] +
+ + + + + diff --git a/websites/www.cs.bgu.ac.il/~elad/GALAPAGOS/19970806122740/~elad/GALAPAGOS/bib.html b/websites/www.cs.bgu.ac.il/~elad/GALAPAGOS/19970806122740/~elad/GALAPAGOS/bib.html new file mode 100644 index 0000000..52609ac --- /dev/null +++ b/websites/www.cs.bgu.ac.il/~elad/GALAPAGOS/19970806122740/~elad/GALAPAGOS/bib.html @@ -0,0 +1,81 @@ + + + + Galapagos - Bibliography + + + + +
+ [PREV] +
+
+

+ +

BIBLIOGRAPHY

+
+ +
    +
  • The +SCHEME FAQ,
    +http://www.cs.cmu.edu:8001/Web/Groups/AI/html/faqs/lang/scheme/top.html +

    • + +

  • The LOGO FAQ,
    +ftp://cher.media.mit.edu/pub/logo/FAQ +

    • + +

  • SCM manual version 4e4, Aubrey Jaffer. SCM 4e4 is available +at:
    +ftp://ftp-swiss.ai.mit.edu/pub/scm/scm4e4.tar.gz +

    • + +

  • Structure and interpretation of computer programs, +Harold Ableson and Gerald J. Sussman with Julie Sussman. +

    • + +

  • Garbage Collection, Andrew W. Appel; appeard +in Topics in Advanced Language Implementation, edited by Peter Lee.

    • +

+ +

+

+

LINKS

+

+

+

+

+

+
+ [PREV] +
+ + + + + diff --git a/websites/www.cs.bgu.ac.il/~elad/GALAPAGOS/19970812032301/~elad/GALAPAGOS/index.html b/websites/www.cs.bgu.ac.il/~elad/GALAPAGOS/19970812032301/~elad/GALAPAGOS/index.html new file mode 100644 index 0000000..56faa74 --- /dev/null +++ b/websites/www.cs.bgu.ac.il/~elad/GALAPAGOS/19970812032301/~elad/GALAPAGOS/index.html @@ -0,0 +1,95 @@ + + + + Galapagos + + + +

Welcome to
+GALAPAGOS

+ +Galapagos is an interactive multithreaded Scheme interpreter with turtle +graphics for Windows 95. It is built around the SCM interpreter, and it +provides multiple interpreters, threads, turtles, and drawing boards, all +running concurrently using WIN32's multithreading abilities, and freely +available. + +

+

+

+

+

+Spring 1997

+Graduation project

+Department of Math & Computer Science,

+Ben-Gurion University of the Negev

+
+Written by Elad Eyal and Miki +Tebeka.
+
+Supervisor: Dr. Michael Elhadad +
+

+

+

+

+ +

TABLE OF CONTENTS

+ + + +

+ +
+ +

DOWNLOAD CENTER

+

+

GNU LICENSE. COPYRIGHTED. PROVIDED "AS IS". NO +WARRANTIES OR LIABILITIES. ETC.
+

+

+500K gps10bin.zip - Executable and required Scheme libraries (SLIB)
+700K gps10src.zip - Same with all source code
+400K mfc40dll.zip - You might need this MFC40.DLL if you +don't have it already.
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zQM*I`QdHz?O45%t<)dct+ez9>l*jAsrlA3kDU<{$UX!Ei$m8>x5>`nFKf@Vm{ScTM z_H!-XVK_LRnp`}1OUo?zs9EX`t5hJIJaIbd`ubz>xa3UVB%weZeU&8hkqAptS~kOP zd#AitUD5?pC9~-8Lzyv^0a|NwiMn4C+*PjYt{a?Cx`g7*Snww3X{4NyOrxZvZ_v}v zODHR9CAkL1CA6n)p3oC=8$MP!VmTWYDD2qZn>&9XHk z98yFTFv-uT+=Flk?K1HD^K`^>G>$Gr|bzd?2}DI<;sm@;zjd9=%RI zI!BD{LXKLQjE|@{@THIyb5t`!D<0~S3y6a$DEIzMABWtR!P}&IZ)pV67I~Q_3_~dmDXJyn2uUchD%p~C@QjznS!zwo)rRf*UWr+Kx zA(?-B@y3^qWZ<-ohb;AEwc|; z0x~>G3%hZIcWau1&c>IJMQK)Q5-Ej*jx2K|#TFkw#}w(o$-@z&ZF_{yo<^!EcPVLnN9jZfyUA1#3@RM=&N z=lmB~RR>*@*tklHQaY_W%DTQdz}GamLo;sviG+745UsYq6|_@T^B$?@y#5pHin9Am zbucgO*MjW;vSxXp%Ika8Sq2R`mveM1s>wliqo+uKYSj-nXi{wJd6y``v$|_#Iwf!XC_3Owdh+CF^;$hK?yCx z#X1KzeaXN4mB@{2d&?!_>FBe^rT3Z_V~Tr_bpd4Yc9BNqz4ebq=^jDU@`Z-q8=1kI zb#GkDv23bW5MzF!5i3)VcV-Yb8F8ZZXxGvpYi4v1GwdvL#~34PtT9KFNph2~94jUq%gP#=oqI8@ ty^JPN*4NdnLF?u>WQS{h&7; + + + Galapagos + + + +

Welcome to
+GALAPAGOS

+ +Galapagos is an interactive multithreaded Scheme interpreter with turtle +graphics for Windows 95. It is built around the SCM interpreter, and it +provides multiple interpreters, threads, turtles, and drawing boards, all +running concurrently using WIN32's multithreading abilities, and freely +available. + +

+

+

+

+

+Spring 1997

+Graduation project

+Department of Math & Computer Science,

+Ben-Gurion University of the Negev

+
+Written by Elad Eyal and Miki +Tebeka.
+
+Supervisor: Dr. Michael Elhadad +
+

+

+

+

+ +

TABLE OF CONTENTS

+ + + +

+ +
+ +

DOWNLOAD CENTER

+

+

GNU LICENSE. COPYRIGHTED. PROVIDED "AS IS". NO +WARRANTIES OR LIABILITIES. ETC.
+

+

+500K gps10bin.zip - Executable and required Scheme libraries (SLIB)
+700K gps10src.zip - Same with all source code
+400K mfc40dll.zip - You might need this MFC40.DLL if you +don't have it already.
+ + diff --git a/websites/www.cs.bgu.ac.il/~elad/GALAPAGOS/19990128140433/~elad/GALAPAGOS/gui.html b/websites/www.cs.bgu.ac.il/~elad/GALAPAGOS/19990128140433/~elad/GALAPAGOS/gui.html new file mode 100644 index 0000000..a6c0244 --- /dev/null +++ b/websites/www.cs.bgu.ac.il/~elad/GALAPAGOS/19990128140433/~elad/GALAPAGOS/gui.html @@ -0,0 +1,73 @@ + + + + Galapago - GUI + + + + + +

+ [PREV] + [PREV] + [PREV] +
+
+

+ +

THE INTERACTIVE GUI

+
+

In order to make Galapagos more fun to learn with, an interactive GUI +(Graphical User Interface) is provided. Users can make changes on the board +while a computation is in progress and effect its execution. Drawing tools +enable the user to draw on the board while a program is being executed. +If a line is drawn in front of a turtle which has a relevant interrupt, +the interrupt will be invoked if needed.
+

+ +

The user has a special user pen that can draw line, rectangles +or free hand. These modes are available from the toolbar. The User's pen +width and color can be modified using the User Pen menu or the toolbar.
+

+ +

Color buttons are provided on the toolbar to give a known RGB color +to the user pen. It is useful when the user draw an object on the board +and wants a turtle to see this object. The colors are:

+ +

White - (255 255 255)

+ +

Black - (0 0 0)

+ +

Blue - (0 0 255)

+ +

Red - (255 0 0)

+ +

Green - (0 255 0)

+ +

Yellow - (255 255 0)
+

+ +

Another option available is changing a turtle's heading and position, +using the Move Turtle button:

+ +


+

+ +

If this button is pressed then a turtle can be dragged to a new location +simply by dragging it with the mouse. In order to change the turtle's heading, +hold down a control key and move the move towards the desired location, +the turtle will follow the movement of the mouse.

+ +

+

+
+ [TOP] + [PREV] + [PREV] + [PREV] +
+ + + + + diff --git a/websites/www.cs.bgu.ac.il/~elad/GALAPAGOS/19990128153816/~elad/GALAPAGOS/implementation.html b/websites/www.cs.bgu.ac.il/~elad/GALAPAGOS/19990128153816/~elad/GALAPAGOS/implementation.html new file mode 100644 index 0000000..822f9b9 --- /dev/null +++ b/websites/www.cs.bgu.ac.il/~elad/GALAPAGOS/19990128153816/~elad/GALAPAGOS/implementation.html @@ -0,0 +1,393 @@ + + + + Galapagos - Implementation + + + + + +
+ [PREV] + [PREV] + [PREV] +
+
+

+ +

IMPLEMENTATION

+ + + +
+

Galapagos was written using Microsoft Visual C++, and is designed to +run under Windows 95. We chose Windows 95 because it seems to have the +largest potential Galapagos users base. The following sections describe +some implementation details of Galapagos.
+

+ +

The SCM interpreter we used as a base is written in C. Most of the original +code we added was written in C++. The parts we used from SCM are almost +identical to the original. In fact, by changing the scmconfig.h file (which +contain machine-specific configuration) and #defining THREAD to be null, +the C files should become equivalent to the sources we used.
+

+ +

We have implemented two MT-safe FIFO message queue classes. Both will +block when trying to read from an empty queue. CMsgQx, the extended +message queue, supports the same interface as the one provided in Scheme, +plus an additional support for "Urgent Messages". These take +precedence over all other messages. CMessageQueue is message queue +with exactly the same interface as the Scheme level message queues, but +which contain internal logic to handle "Urgent" messages used +to deal with cases where synchronous respond is needed, such as I/O, Garbage +collection, and Scheme-level inter-thread communications.
+

+ +

FITTING SCM INTO WINDOWS
+

+ +

Galapagos is based on SCM, which is a single-thread, read-evaluate-print-loop +(repl) based Scheme interpreter. The most important issue in migrating +SCM was how to maintain the interpreter's natural repl-based approach, +yet allow for multiple threads to interact, and for Windows messages to +be processed quickly.
+

+ +

We used WIN32's multithreading capabilities to solve these problems. +A single thread handles all aspects of the GUI - in a sense, "all +that is Windows": graphic boards, turtles, consoles, menus and so +on. Each interpreter runs in a thread of its own, interacting with the +GUI using a message queue similar to the one provided at the Scheme level.
+

+ +


+

+ +

The GUI thread manages both commands received from the OS and from the +different interpreters running on their own threads. To ensure as fast +responses as possible, priorities are used: OS messages (such as windows +updates and input devices) gets highest priority; Console (text messages) +come second, and graphics messages are last. This allows the interpreters +to run interactively in a satisfactory manner.
+

+ +

SCM interpreter threads each run in the old-fashion repl mode. When +a computation is over, the interpreter blocks until new input comes from +the GUI thread. All blocking functions were modified to allow synchronous +messages (such as the one generated by tell-thread) to work. In +addition, SCM's "poll routine" is used to force checking for +such messages even during computations.
+

+ +

An additional thread is used for Garbage Collection. It is described +in detail in the section dealing with garbage collection.
+

+ +

GARBAGE COLLECTION

+ +

In this section we will briefly describe SCM's garbage collector, and +then discuss the modifications done to adapt it to Galapagos's multithreading +computations. It should be noted that the garbage collector used is a portable +garbage collector taken from "SCHEME IN ONE DEFUN, BUT IN C THIS TIME", +by George J Carrette <gjc@world.std.com>.
+

+ +

SCM uses a conservative Mark & Sweep garbage collector (GC). All +Scheme data objects share some common configuration (called "cells"): +They are 8-byte aligned; they reside is specially-allocated memory segments +(called hplims); they are the size of two pointers (so a scheme cons is +exactly a cell); and they contain a special GC bit used by the garbage +collector. This bit is 0 during actual computations. When a new cell is +needed and all the hplims are used, garbage collection is initiated. If +it does not free enough space to pass a certain threshold, a new hplim +is allocated.
+

+ +

The first stage in garbage collection is marking all cells which are +not to be deleted. Some terminology might be helpful here:
+

+ +
    +
  • A cell (or any data object) is called alive if it may +in some way influence the future of the computation. Needless to say, discovering +which cells are alive and which are not is impossible, because of the very +nature of the future.
    • +
+ +
    +
  • A cell is called reachable if the computation can read +its value. Some data is immediately reachable: The data on the machine's +stack or in the CPU registers, for example; some interpreters store some +information in a fixed location so it's permanently reachable. In SCM the +array sys_protects[] is used for +this propose. The set of reachable cells is the union of all immediately +reachable cells, and all those cells pointed by reachable cells, recursively. +
    • +
+ +

Obviously, all unreachable data is dead. Conservative garbage collectors +treat all reachable data as alive.
+

+ +

The Mark stage of the garbage collector scans the sys_protects[] +array and the machine's stack and registers for anything that looks like +a valid cell. All cell pointer have their 3 least significant bits zero, +and are in one of few known ranges (the hplims). The garbage collector +searches for anything matching a cell's bit pattern, and treats it as an +immediately reachable cell pointer. In some cases, this may mean an integer, +for example, happens to match the binary pattern and thus be interpreted +as a cell pointer. However, this will only mean some cell or cells are +marked as reachable though they are not such. Because of the uniform structure +of the cell and its limited range of possible locations, such an accident +is guarantied not to corrupt memory. Furthermore, if we accept the assumption +that integers are usually relatively small, and memory addresses are relatively +big, we conclude that such accidents are not very likely to happen often +anyway.
+

+ +

During mark stage, the garbage collector recursively finds (a superset +of) all live cells, and marks them by setting their special GC bit to 1. +The second stage is the Sweep stage, in which all the hplims are scanned +linearly, and every cell which is not marked is recognized as dead, and +as such is reclaimed as free. Marked cells get unmarked so they are ready +for the next garbage collection.
+

+ +

Mark & Sweep garbage collection has two main disadvantages: One, +that it requires all computation to stop while garbage collection is in +progress. In Galapagos, since all threads use a shared memory heap, it +means all threads must synchronize and halt while garbage is collected. +Second, Mark & Sweep is very likely to cause memory fragmentation. +However, since cells are equally sized, fragmentation is only rarely a +problem.
+

+ +

We chose to stick with Mark & Sweep in Galapagos because of its +two major advantages: Simplicity and efficiency. Mark & Sweep GC does +not affect computation speed, because direct pointers are used. Most concurrent +garbage collectors work by making all pointers indirect, which may slow +computations down considerably. The need to halt all threads for GC is +accepted. Since memory is shared, it would only be fair to stop all threads +when GC is needed: Threads will probably halt anyway since cells are allocated +continuously during computations.
+

+ +

Two major issues are introduced when trying to multithread the garbage +collector. One is the synchronization of the different threads, which run +almost completely unaware one of the other; the second is the need to mark +data from every thread's specific stack, registers, and sys_protects[]. +We solved these two issues by combining them to one.
+

+ +

The intuitive approach might be to let each thread mark its own information, +and then sweep centrally. However, since synchronization of threads is +mandatory, letting every thread mark its own data will lead only to redundant +marking and to excessive context switches, since each threads has to become +active. Therefore we created the "Garbage Collection daemon" +(GCd), which runs in a distinct thread and lasts for the whole Galapagos +session. The GCd is not an interpreter, but a mechanism which keeps track +of live threads and their need of GC. The GCd thread is always blocked, +except when a thread notifies it on its birth or death, or when a thread +indicates the need for garbage collection. Since the GC daemon is blocked +whenever it is not needed, and then becomes the exclusive running thread +during actual GC (with the exception of the GUI thread), its existence +does not hurt performance.
+

+ +

To explain how the GCd synchronizes all threads, let us examine the +three-way protocol involved. freelist +is a global pointer which holds a linked list of free cells - it can be +either a cell pointer, a value indicating "busy" (thus implementing +busy/wait protection over it) or "end of memory" which is found +at the end of the linked list. MIB stands for Memory Information +Block, which is a block of memory containing all of a thread's +immediately reachable data.
+

+ +

GCd scenario: GCd is blocked until a threads sends a GC +request.

+ +
    +
  1. GCd scans through its list of active threads, and sends each a MIB +request.
    2. + +
  2. It then blocks until all MIB blocks are received. GCd ignores further +GC request messages it get.
    3. + +
  3. At this point all threads are blocked. The GCd has gained, therefore, +exclusive access to the hplims. The GCd now marks all reachable cells, +inspecting each MIB block for immediately reachable cells and proceeding +recursively. Then, it sweeps.
    4. + +
  4. If needed, the GCd allocated a fresh hplim.
    5. + +
  5. GCd sends every thread a message allowing it to resume. Then it blocks +waiting for the next time.
    6. +
+ +

Scenario 1: A thread needs to allocate a cell but can't. +

+ +
    +
  1. The thread sends GCd a GC request message.
    2. + +
  2. Then it suspends until GCd sends it an MIB request.
    3. + +
  3. When one arrives, the thread generates and sends a MIB block to the +GCd.
    4. + +
  4. And blocks again until GCd notifies it that GC is done.
    5. + +
  5. At this point free cells are available and the computation can resume. +
    6. +
+ +

Scenario 2: A thread receives a MIB request. This +may happen within a computation or when considered otherwise blocked - +waiting for input, for example.

+ +
    +
  1. The thread generates and sends a MIB block to the GCd.
    2. + +
  2. And blocks until GCd notifies it that GC is done.
    3. +
+ +

The important thing to note about this protocol is its indifference +to the GC "initiator". Several threads can "initiate" +GC, and each request is "satisfied", although of course only +one GC takes place. The GCd itself is unaware of the initiating thread +identity, and completely ignores any further GC requests. It treats all +threads identically. This is important because it allows each thread meeting +a low memory condition to initiate GC immediately. This is in fact the +mechanism which saves us from explicitly checking for a third-party GC +request during computation: If a thread runs out of memory, the freelist +variable is kept at "out of memory" state, causing any other +thread trying to allocate memory to initiate GC as well. This simplifies +the GC protocol (technically, if not conceptually), and does it with almost +no affect on computation speed.
+

+ +

BOARDS
+

+ +

A board or a view as it called in MFC is the environment where a turtle +moves and interact with. It hold two main data structures. The first is +the bitmap of the drawing. It is a 800X600 bitmap. Every time a turtle +draws on the board it makes its pen the active pen on the board and draws +on it. Every time the picture needs refreshing (as signaled by the operating +system) it is the board's duty to copy the relevant section from the bitmap +to the screen. The second data object is the turtles list, an expandable +array of turtles which holds pointers to all turtles on the specific board.
+

+ +

The most important part in the board's work is to notify the turtles +on any event that happened on the board such as drawing, changing background +or moving of a turtle. If for example a user draws a line on the board, +the board (after drawing the line) goes through the turtles list and tell +each one that some event happened at a rectangle that contains the line. +Each turtle will decide if this has any importance to it or not.
+

+ +

Apart from that, the board handles all the user interface from the menus +and the toolbar. The most obvious example is the move turtle button, which, +when pressed, causes the board to find a turtle close enough to the click's +location. Then, on every movement of the mouse it gives the turtle a command +to move to this point.
+

+ +

In order to support scrolling of the picture, we derived the CBoardView +class from CScrollView. The interface with the interpreter threads +is done via a message queue. The main function is ReadAndEval, +which gets a message and then interprets its and act upon the result.
+

+ +

TURTLES
+

+ +

In addition to a pointer to its current board, and to inner-state variable +which affects its graphical aspects, every turtle holds an expandable array +of interrupts. When a turtle gets from the window that a message signifying +that some change has happened, it sends this change to each of its interrupts +(only if the interrupt flag is on) and the interrupt is responsible to +send an appropriate message if necessary. The turtle's location are stored +as floating points on x,y axes, to allow for accuracy on the turtle's location +and heading.
+

+ +

The turtles interacts with the interpreter thread using a message queue. +As with the board, the main function here is the ReadAndEval, +which translates these messages to valid function calls.
+

+ +

VISION
+

+ +

Every turtle holds a pointer to the bitmap it is drawing on. When it +is "looking" for a color it calculates the minimal rectangle +that holds the desired area. Then it iterates on all the pixels in this +rectangle. First it checks if the pixel is in the vision area using the +sign rule to determine if a point is clockwise or anti clockwise from a +line, and then check for distance. If the point is in the relevant area +the turtle gets its color from the bitmap and compares it with the sought +color.
+

+ +

When looking for a specific turtle, the turtle gets this turtle's position +and calculates if this location is in the relevant area using the same +algorithm. When looking for any turtle, the turtle passes the relevant +arguments to the view, which then uses the same algorithm for each turtle +on its turtles array.
+

+ +

INTERRUPTS
+

+ +

Each turtle holds an expandable array of interrupts. Each interrupts +is an object that is much like a turtle vision. The interrupts has the +view area argument and what it is looking for. It also has the message +it needs to send and a pointer to the given queue. When the turtle notifies +the interrupt that a change has happened, the interrupt first checks if +the change is an area which is of interest to it. If so it calls the turtle +look function with its location and the sought object. According to the +turtle's answer and to the data stored inside the interrupt, the interrupt +sends the needed message, if any.
+
+

+ +

CLASS ORGANIZATION
+

+ +


+
+

+ +

Message-passing mechanisms:
+

+ +

+

+ + + +

+

+
+ [TOP] + [PREV] + [PREV] + [PREV] +
+ + + + + + diff --git a/websites/www.cs.bgu.ac.il/~elad/GALAPAGOS/19990129014748/~elad/GALAPAGOS/manual.html b/websites/www.cs.bgu.ac.il/~elad/GALAPAGOS/19990129014748/~elad/GALAPAGOS/manual.html new file mode 100644 index 0000000..030d010 --- /dev/null +++ b/websites/www.cs.bgu.ac.il/~elad/GALAPAGOS/19990129014748/~elad/GALAPAGOS/manual.html @@ -0,0 +1,1404 @@ + + + + Galapagos - Programmer's Manual + + + + + +
+ [PREV] + [PREV] + [PREV] +
+
+

+ +

PROGRAMMER'S MANUAL:
+NONSTANDARD PRIMITIVES

+ + + +

+

+ +

Welcome to Galapagos Scheme. This chapter is intended +as a quick reference to Galapagos's extensions over traditional Scheme. +Knowledge of Scheme is assumed. Galapagos Scheme is compliant with both +R4RS and IEEE standard P1178. If you've read the chapter titled +"Scheme extensions", you can and should skip the short introduction +in each section. This complete chapter appears as on-line help in Galapagos, +just a F1 click away.
+

+ +

+

+ +

ENVIRONMENTS
+

+ +

An environment is a list of frames, +with the global environment in its tail. A frame is a list +of bindings, which map variables to their values. (define...) +adds a binding to the frame at the top of the current environment. +(set!...) family of commands modify +an existing binding, in the frame where it was defined. When a variable +is referenced, the current environment is searched from head to tail, and +the first binding found dictates the value of the variable.

+ +

The first interpreter, which pops up as Galapagos +is started, runs at the global environment (the way traditional Scheme +works). Additional interpreters (threads) run at distinct environments, +which contain a single initially empty frame, and a pointer to the global +environment.
+
+

+ +

(clone-environment +env [depth])
+

+ +

Clone-environment will make an exact copy of the +environment env, by copying its frames +one by one. If depth is specified then the new environment will be the +collection of frames which is up to depth +frames from the current frame. And the last frame will point to the depth ++ 1 frames from the current one in env. +
+

+ +

This means that if we are now in environment e1 +and done (define x 7). Then if we'll +write

+ +

(define e2 (clone-environment +(current-environment))),

+ +

the result of

+ +

(eval@ e2 x) +

+ +

will return 7.
+

+ +

But if we are not in a lower frame than the one +x was defined in and write

+ +

(define e2 (clone-environment +(current-environment) 1))

+ +

and write the value of x is undefined.

+ +

(Unless it was defined in the global environment) +
+

+ +

Note: Only the bindings are copied. The bound values +are not. Example:

+ +

(define x (cons 1 2)) +

+ +

(define e (clone-environment +(current-environment)))

+ +

(eval@ e (set-cdr! X 6)) +

+ +

will change the 2 into 6 at both environments. +However,

+ +

(set! x 7) +

+ +

will only affect one copy.
+

+ +

(pop-environment +env)
+

+ +

Returns the current environment without the first +frame. This means the first frame on the list of frames is "popped" +out.

+ +

If env was +made from f3->f2->f1->Global, the result will be f2->f1->Global. +

+ +

(fx means frame number x)

+ +

Example:

+ +

(define e2 (pop-environment +(current-environment)))
+

+ +

(extend-environment +env)
+

+ +

Extends env with +a new empty frame (where nothing is defined yet).

+ +

This means the if env +was f2->f1->Global the result will be f3->f2->f1->Global. +

+ +

(fx means frame number x)

+ +

Example:

+ +

(define e2 (extend-environment +(current-environment)))
+

+ +

(current-environment) +
+

+ +

Returns the current environment.
+

+ +

(environment? +env)
+

+ +

A predicate that is true if env +is an environment.

+ +

Example:

+ +

(environment? (current-environment)) +

+ +

Will return true.
+

+ +

(parent-environment) +
+

+ +

Returns the parent environment. This is the environment +where (new-thread) was called to create +this thread. The First thread returns the global environment.

+ +

Example:

+ +

(eval@ (parent-environment) +y)

+ +

Will return the value of y in the parent environment.
+

+ +

(base-environment) +
+

+ +

The environment where the interpreter runs.
+

+ +

(set-base-environment +env)
+

+ +

Sets the base environment (where the interpreter +runs) to be env

+ +

Example:

+ +

(set-base-environment +(parent-environment))

+ +

Will make this thread run in the same environment +as its father)
+

+ +

(eval@ env forms...) +
+

+ +

Evaluates forms in given environment.

+ +

Example:

+ +

(define x 7) +

+ +

(define e2 (clone-environment +(current-environment)))

+ +

(eval@ e2 x)
+

+ +

The result will be 7
+

+ +

(eval@p forms...) +
+

+ +

Evaluates forms in parent environment.

+ +

Example:

+ +

Say we want to make our turtle walk 30 degrees +more than the father's turtle. Then we can write:

+ +

(set-heading! T (+ 30 +(eval@p (turtle-heading t))))
+

+ +

MESSAGE QUEUES
+

+ +

Message queues are MT-safe mechanisms used to pass +messages, possibly between threads. Messages accepted must be cons, its +car being the message type and the cdr is the message body. Both can be +any kind of Scheme object.
+
+

+ +

(make-queue) +

+ +

Creates a new message queue.

+ +

Example:

+ +

(define q (make-queue)) +
+

+ +

(message-queue? +q)

+ +

A predicate that is true if q +is a queue.

+ +

Example:

+ +

(message-queue? q)

+ +

Will return true for q from the previous example.
+

+ +

(peek-message +q [type])
+

+ +

Return true if there is a message (of given type, +or of any type if unspecified) in the queue q. +

+ +

Example:

+ +

(peek-message q) +

+ +

Will return falsif the queue q is empty. +

+ +

Note: types are compared using (equals?) +.
+

+ +

(post-message +q typ_msg)
+

+ +

Posts the message typ_msg +to the queue q.

+ +

typ_msg must +be a cons (type . message).

+ +

Example:

+ +

(post-message q (cons +'type-welcome 'hello))
+

+ +

(get-message [time-out] +q [type])
+

+ +

Get message from queue q +, if time-out is defined +waits only time-out seconds, and

+ +

optionally gets only messages from type type. +

+ +

Example:

+ +

(define msg (get-message +7 q 'type-welcome))

+ +

The result will be (if the previous posting was +done) ('type-welcome . 'hello)

+ +

Note: types are compared using (equals?) +.
+

+ +

WINDOW COMMANDS
+
+

+ +

A window is the graphical board on which the turtles +and the user draw. It is a bitmap of size 800x600.
+
+

+ +

(new-window [name]) +
+

+ +

Makes a new window, name +is a symbol or a string which will also be the window's title. The window's +color will be white and it's size 800x600.

+ +

Example:

+ +

(define w (new-window +'my-window))

+ +

Will create a new window with the title my-window. +
+

+ +

(rename-window! +win [name])
+

+ +

Renames the window win. name +is a symbol or a string which will also be the window's title.

+ +

Example:

+ +

(rename-window! w 'foo) +

+ +

Will make the title of w to be foo.
+

+ +

(set-background-color! +R G B)
+

+ +

Set the background color of the window. All the +turtles in the window are notified on the new color (used in pen-erase) +

+ +

The colors are defined in terms of Red +Green Blue +(where 0,0,0 is black and 255,255,255 is white).

+ +

Example:

+ +

(set-background-color! +w 255 255 0)

+ +

Will turn the background color of w +to yellow
+

+ +

(clear-window +w)
+

+ +

Clears the screen from all the previous drawings, +leaving only the turtles images on it.

+ +

Example:

+ +

(clear-window w)
+

+ +

(load-bitmap w +"filename" [x y])
+

+ +

Loads the bitmap "filename" +and makes it the background of w. x y are +the coordinates of the upper left corner of the picture. If x +y are not given then the picture is centered.

+ +

Example:

+ +

(load-bitmap w "c:\\windows\\forest.bmp") +
+

+ +

This operation can also be done using the Board +menu.
+
+

+ +

(save-bitmap w +"filename")
+

+ +

Saves the window into a bitmap file called "filename". +

+ +

Example:

+ +

(save-bitmap w "my_draw.bmp") +
+

+ +

This operation can also be done using the Board +menu.
+

+ +

(window-alive? +win)
+

+ +

True if win +is alive, meaning it can get commands.
+

+ +

(window-name w) +

+ +

Returns the name of w. +

+ +

Example:

+ +

(window-name w) +

+ +

Will return "foo" on our window.
+

+ +

TURTLE COMMANDS

+ +

A turtle is an object which is connected to a certain +window. It has inner state variables:
+

+ +

- width: the width +of the pen.

+ +

- heading: the direction +the turtle will go on command forward!. +The heading is in degrees where 0 is upwards and adding to the heading +means clock wise rotation.

+ +

- visibility: if the +body of the turtle is visible on the board or not.

+ +

- solid: if the turtle +is a "solid" turtle (its interior is also drawn) or "hollow" +one (only its circumference is drawn).

+ +

- position: the location +of the turtle on the board, where 0,0 is the upper left corner. +

+ +

- color: the color +of the turtle and it's pen, given in RGB format.

+ +

- pen condition: the +turtle's pen can be in three states:

+ +
    +
  • pen-down : the turtle +will draw as it moves.
    • + +
  • pen-up : the turtle +will not draw as it moves.
    • + +
  • pen-erase : the turtle +will draw in the color of the background as it moves.
    • +
+ +

- pen width: the width +of the pen, the bigger the width the thicker the pen will be.
+

+ +

Turtles can also "see" the board or other +turtles (only from the same board) and can handle user interrupts. A turtle +is always connected to a certain view, which is the view it is drawing +on. Turtles can move between views.
+
+

+ +

(make-turtle win +[name])
+

+ +

Creates and return a new turtle, in window win, +optional name (where name can be anything). +

+ +

The inner state of the new turtle will be: +

+ +
    +
  • position - 400,300
    • + +
  • heading - 0
    • + +
  • color - 0,0,0 (black)
    • + +
  • width - 2
    • + +
  • visible - true
    • + +
  • solid - true
    • +
+ +

Example:

+ +

(define t (make-turtle +'turty))
+

+ +

(turtle-alive? +t)
+

+ +

A predicate that is true if t +is alive, meaning t can get commands. +

+ +

Example:

+ +

(turtle-alive? t)

+ +

Will return true on our t.
+

+ +

(clone-turtle +t [name])
+

+ +

Creates an identical turtle to t +(same inner state).

+ +

Example:

+ +

(define t2 (clone-turtle +t))
+

+ +

(rename-turtle +t [name])
+

+ +

Renames the turtle, name is a string or a symbol +

+ +

Example:

+ +

(rename-turtle t 'pongy) +
+

+ +

(turtle-name t) +
+

+ +

Returns the name of t. +

+ +

Example:

+ +

(turtle-name t) +

+ +

Will return "pongy" on our t.
+

+ +

(forward! t d)
+

+ +

Makes t go +forward (in the heading of t) +d steps. +t will draw while going according to +the state of it's pen.

+ +

Example:

+ +

(forward! t 100) +

+ +

Will cause t +to go forward 100 steps. (In our case since t's +heading hasn't changed it will go upwards)
+

+ +

(turtle-width! +t n)

+ +

Set the width of t's +pen to be n. The bigger n +is the wider the pen will be.
+

+ +

(backwards! t +d)
+

+ +

Same as forward, just in the opposite direction. +

+ +

Example:

+ +

(backwards! t 100) +

+ +

is the same as

+ +

(forward! t -100)
+

+ +

(right! t d)
+

+ +

Will set a new heading to t. +The new heading is the old heading plus d, meaning +t will rotate clock-wise.

+ +

Example:

+ +

(right! t 90) +

+ +

Will make t +turn 90 degrees to the
+

+ +

(left! t d) +

+ +

Same as right, other direction
+

+ +

(set-heading! +t val)
+

+ +

Sets the heading of t +to be val. 0 is upwards and 90 is to +the right.

+ +

Example:

+ +

(set-heading t 180) +

+ +

Will cause t +to point to the bottom of the screen.
+

+ +

(move-to! t x +y)
+

+ +

Makes t move +to point x,y without painting. 0,0 +is the top-left corner of the window.

+ +

Example:

+ +

(move-to! T 100 100) +

+ +

Will cause t +to move to point 100,100.
+

+ +

(draw-to! t x +y)
+

+ +

Moves t to +x,y possibly drawing or erasing according +to the state of t's pen.

+ +

Example:

+ +

(draw-to! t 0 0)
+

+ +

(move-turtle-to-window +t win)

+ +

Move t to the +window win

+ +

Example:

+ +

(move-turtle-to-window +t w)
+

+ +

(pen-up! t)
+

+ +

The pen of t +is up, so he won't paint when moving.

+ +

Example:

+ +

(pen-up! t)
+

+ +

(pen-down! t)
+

+ +

Causes t's +pen to be down, meaning he will draw as he is moving.
+

+ +

(pen-erase! t)
+

+ +

Causes t's +pen to be in the same color as the background color of the window it is +attached to.
+

+ +

(show-turtle! +t)
+

+ +

Makes t visible. +Meaning he will be seen on the board.

+ +

Example:

+ +

(show-turtle! t)
+

+ +

(hide-turtle! +t)
+

+ +

Makes t invisible. +Meaning he will not be seen on the board. (but all the drawing he does +will be seen)

+ +

Example:

+ +

(hide-turtle! t)
+

+ +

(make-turtle-solid! +t)
+

+ +

Makes t a solid +turtle.
+

+ +

(make-turtle-hollow! +t)
+

+ +

Make t a "hollow" +turtle.
+

+ +

(kill-turtle! +t)
+

+ +

Kills t. Meaning +it will be erased from the board and will not accept further commands. +

+ +

Note: This is the only way to get rid of a turtle. +

+ +

Example:

+ +

(kill-turtle! t) +

+ +

Will cause when writing t +in the command line to the response

+ +

#<dead turtle>
+

+ +

(set-color! t +R G B) or (set-color! t (list R G B)
+

+ +

Sets t's color +(and it's pen), in RGB format.

+ +

Example:

+ +

(set-color! t 255 0 255) +

+ +

Will cause t +to be pinkish.

+ +

Same as:

+ +

(define pinkish '(255 +0 255))

+ +

(set-color! t pinkish)
+

+ +

(turtle-inner-state +t)
+

+ +

Returns a list of 6 parameters: color, heading, +hidden-flag, pen width, solid flag, location (cons x y))

+ +

Example:

+ +

(define new-t (make-turtle +w))

+ +

(turtle-inner-state new-t) +

+ +

Will return the list

+ +

((0 0 0) 0.0 #f 2 #t (400.0 +. 300.0))
+

+ +

Below are functions that returns only one of the +parameters returned by turtle-inner-state: +
+

+ +

(turtle-color t) +

+ +

(turtle-heading t) +

+ +

(turtle-visible t) +

+ +

(turtle-width t) +

+ +

(turtle-solid? t) +

+ +

(turtle-position t)
+

+ +

TURTLE VISION
+

+ +

A turtle can interact with the board. It can "see" +colors or other turtles.
+
+

+ +

(look t distance +angle '(R G B))
+

+ +

Will return true if there is a point in color (R +G B) in distance distance from +t and in the area bordered by the angle +2*angle.

+ +

Example:

+ +

(look t 50 20 '(0 0 0)) +

+ +

Will cause t +to search for the color black (RGB 0,0,0) in the area shown here in blue:
+

+ +


+

+ +

(look t distance +angle [t1])
+

+ +

Same as if looking for color, just this time it +will be true is t1 is in the visible area.

+ +

If no target turtle is defined then the function +will return true if any turtle from this window is in the visible area. +

+ +

Example:

+ +

(define new-t (clone-turtle +t))

+ +

(forward! new-t 30) +

+ +

(look t 50 20 new-t) +

+ +

And

+ +

(look t 50 20) +

+ +

Will both return true.
+
+

+ +

INTERRUPTS (NOTIFICATIONS) +
+

+ +

A turtle can hold a list of interrupts (or notifications). +When an interrupt is invoked it send a given message to the thread that +sent the command. Every interrupt is defined by a "look" arguments. +An interruptcan be of three kinds:
+

+ +

A "yes" interrupt - The interrupt will +happen (message sent) on every "first" time the look returns +yes.

+ +

Meaning if a turtle is told to invoke an interrupt +every time it sees blue on a certain region. Then the first time it sees +blue it will invoke the interrupt. From now on if the blue is in view it +will not invoke the interrupt. Then if it loses sight of the blue object, +the next time it sees blue again it will invoke the interrupt, and so on.
+

+ +

A "no" interrupt - Same as the "yes" +interrupt, just this time the interrupt is invoked when the sought object +is not seen.
+

+ +

A "both" interrupt - First time the sought +object is viewed the "yes" message is sent, then the first time +the turtle loses sight of the object the "no" message is sent +and so on.

+ +

A message can be any SCHEME object.
+

+ +

When the interpreter is installing interrupt to +a turtle it need to install a handler, which is a function that +takes only one argument and this argument is the messages that comes from +the interrupt.

+ +

If no handler is installed, the messages will be +sent but will have no affect on the thread of execution.

+ +

There can be only one handler per thread and a +handler can not be a primitive procedure.
+

+ +

(turtle-notify +t msg1 msg2 distance angle TARGET)

+ +

Instructs a turtle to send msg1 and msg2 upon seeing +and not seeing, respectively, the target. The messages can be any Scheme +objects, which are sent to the thread as if by (tell-thread). The other +parameters - see (look)

+ +

Example:

+ +

(turtle-notify t 'yes +'no 50 10 new-t)

+ +

This is a "both" kind interrupt.
+

+ +

(turtle-no-notify +t distance angle TARGET)
+

+ +

Tells the turtle to stop notifying in the given +case. Very like deleting the interrupt from the turtle.
+

+ +

(notify-when[-not] +t1 msg dist ang TARGET)
+

+ +

Instructs a turtle to send msg upon [stopping] +seeing the target. This is a "yes" or "no" interrupt. +

+ +

Example:

+ +

(notify-when t 'gotcha +50 10 new-t)

+ +

Will cause t +to send the message "gotcha" every "first" time it +sees new-t.
+

+ +

(stop-notifying +t)
+

+ +

t will temporarily +stop notifying on interrupts. Like "clear interrupts".
+

+ +

(continue-notifying +t)
+

+ +

t will resume +notifying on interrupts.
+

+ +

(no-notifications +t)

+ +

Deletes all t's +interrupts.
+

+ +

(notify-on-click +turtle msg)
+

+ +

Instructs turtle to send msg when right-clicked +with the mouse (distance of 5 pixels from the turtle location). There can +be only one interrupt of this kind per turtle.

+ +

Example:

+ +

(notify-on-click t 'ouch) +

+ +

Will case t +to send the message "ouch" when the user right-clicks next to +it.
+

+ +

(notify-on-click +window msg)
+

+ +

Instructs window to +send msg when right-clicked with the +mouse not close to any turtle.
+

+ +

(clear-notify-click +t)
+

+ +

Clears the user right click interrupt
+

+ +

(install-handler +func)
+

+ +

Installs a message handler. When a message arrives, +func is called with it as a sole argument. +

+ +

There can be only one handler per thread. func +can not be a primitive procedure.

+ +

Example:

+ +

(define (print x) (write +x))

+ +

(notify-on-click t 'click-on-t) +

+ +

(install-handler print) +

+ +

Will cause that the message "click-on-t" +will be printed each time the user right clicked on t. +
+

+ +

THREADS
+

+ +

Galapagos supports multiple threads. Every thread +is a complete Scheme interpreter, with its own base environment. Every +thread has a Thread Object, which uniquely identifies it.
+

+ +

A console is a text window where the user +can type commands (when the interpreter is idle) and see output. A thread +may or may not be bound to a console. Information printed by a non-bound +thread is lost; a non-bound thread waiting for input is stuck (unless provisions +were made to allow a new console to be created by means of inter-thread +communications.) If a non-bound thread has nothing to do, instead of waiting +for input like a bound thread, it will terminate.
+

+ +

(this-thread)
+

+ +

Returns the thread-object of the current thread. +

+ +

Example:

+ +

(this-thread) +

+ +

Will return something like

+ +

#<thread 0x6d1e2c> +
+

+ +

(is-first-thread?) +
+

+ +

True if the current thread is the first SCM thread.
+

+ +

(thread? t) +

+ +

True if t is a thread

+ +

Example:

+ +

(thread? (this-thread)) +

+ +

Will return true
+

+ +

(active-threads) +
+

+ +

Returns the number of active threads
+

+ +

(new-thread form+) +

+ +

Creates a new thread that will calculate the form[s] +

+ +

Example:

+ +

(new-thread (define t +(make-turtle w)) (forward! t 200))

+ +

Will make a new thread that will create a new turtle +and will move it forward 200 steps and then terminates.

+ +

(new-thread (bind-to-console)) +

+ +

Will make a new thread that's ready to accept commands +form a newly-created window. The same can be achieved by selecting "Fork" +from "Scheme" menu.
+
+
+

+ +

(break& form+) +
+

+ +

Causes the current thread to stop and calculate +the form[s]. The current computation is lost.
+

+ +

(bind-to-console) +
+

+ +

The thread will get its commands from a console. +

+ +

Example:

+ +

(new-thread (bind-to-console)) +

+ +

Will create a new thread that gets it.
+

+ +

(unbind-console) +

+ +

Close bound console.
+

+ +

(rename-console +name)

+ +

New name for the current console
+

+ +

(install-handler +func)
+

+ +

Installs a message handler. When a message arrives, +func is called with it as a sole argument. +

+ +

There can be only one handler per thread. func +can not be a primitive procedure.

+ +

Example:

+ +

(define (print x) (write +x))

+ +

(notify-on-click t 'click-on-t) +

+ +

(install-handler print) +

+ +

Will cause that the message "click-on-t" +will be printed each time the user right clicked on t. +

+ +

Note: (new -thread (install-handler +f)) is a bad idea, because the fresh thread will terminate immediately. +
+

+ +

(tell-thread th +x)
+

+ +

Sends message X +to thread th. Returns true on success. +

+ +

If th has no +handler installed it will cause nothing.
+

+ +

(quit-thread)
+

+ +

Kills the current thread, does not work on the +main thread.
+

+ +

(quit-program)
+

+ +

Quits the program.
+
+
+

+ +

These are primitives taken from SCM, which were +modifies to be multithread-safe: + +

+ + +

+An arbiter +is a data object the canbe used as a +guard for critical sections. It can be either "locked" or "unlocked". It +is ideal when a busy/wait mechanism is required, since it is MT-safe. +

+ + +

(sleep n) +

+ +

Causes the current thread to block for (approximately) +n seconds. (sleep 0) is a way to instruct +a thread to give up its remaining processor time.
+

+ + +

(make-arbiter +name)
+

+ +

Makes an arbiter called name. +

+ +

Example:

+ +

(define x-arb (make-arbiter +'x-guard))
+
+

+ +

(try-arbiter arb) +
+

+ +

Checks if the arbiter arb +is up. If the arbiter is up returns false, otherwise it sets +the arbiter to be "up" and returns true.

+ +

Example:

+ +

(try-arbiter x-arb) +

+ +

Will return true and set x-arb +to be "up". But trying it for the second time return false since +x-arb is "up".
+

+ +

(release-arbiter +arb)
+

+ +

Set the arb +to be "down". If the arbiter was "up" returns true +otherwise returns false.

+ +

Example:

+ +

(release-arbiter x-arb) +

+ +

Will return true , but using this function again +will return false since x-arb is already +down.

+ + +

+

+
+ [TOP] + [PREV] + [PREV] + [PREV] +
+ + + + + diff --git a/websites/www.cs.bgu.ac.il/~elad/GALAPAGOS/19990417073305/~elad/GALAPAGOS/index.html b/websites/www.cs.bgu.ac.il/~elad/GALAPAGOS/19990417073305/~elad/GALAPAGOS/index.html new file mode 100644 index 0000000..56faa74 --- /dev/null +++ b/websites/www.cs.bgu.ac.il/~elad/GALAPAGOS/19990417073305/~elad/GALAPAGOS/index.html @@ -0,0 +1,95 @@ + + + + Galapagos + + + +

Welcome to
+GALAPAGOS

+ +Galapagos is an interactive multithreaded Scheme interpreter with turtle +graphics for Windows 95. It is built around the SCM interpreter, and it +provides multiple interpreters, threads, turtles, and drawing boards, all +running concurrently using WIN32's multithreading abilities, and freely +available. + +

+

+

+

+

+Spring 1997

+Graduation project

+Department of Math & Computer Science,

+Ben-Gurion University of the Negev

+
+Written by Elad Eyal and Miki +Tebeka.
+
+Supervisor: Dr. Michael Elhadad +
+

+

+

+

+ +

TABLE OF CONTENTS

+ + + +

+ +
+ +

DOWNLOAD CENTER

+

+

GNU LICENSE. COPYRIGHTED. PROVIDED "AS IS". NO +WARRANTIES OR LIABILITIES. ETC.
+

+

+500K gps10bin.zip - Executable and required Scheme libraries (SLIB)
+700K gps10src.zip - Same with all source code
+400K mfc40dll.zip - You might need this MFC40.DLL if you +don't have it already.
+ + diff --git a/websites/www.cs.bgu.ac.il/~elad/GALAPAGOS/19990424140956/~elad/GALAPAGOS/extensions.html b/websites/www.cs.bgu.ac.il/~elad/GALAPAGOS/19990424140956/~elad/GALAPAGOS/extensions.html new file mode 100644 index 0000000..67d97f1 --- /dev/null +++ b/websites/www.cs.bgu.ac.il/~elad/GALAPAGOS/19990424140956/~elad/GALAPAGOS/extensions.html @@ -0,0 +1,493 @@ + + + + Galapagos - Scheme Extensions + + + + + +

+ [PREV] + [PREV] + [PREV] +
+
+

+ +

SCHEME EXTENSIONS
+

+ + + +

+

+ +

We have extended Scheme in two main +directions: Turtle graphics and multithreading:
+

+ +

The turtle object lives on a board on which it can move and draw. +A turtle can also communicate with the board and "see" colors +or other turtles. Galapagos Scheme provides a set of primitives to create +and manage such turtles and the boards they live on.
+

+ +

A set of additional primitives enable the programmer to create multiple +interpreters that run concurrently. The environment model was extended +to support shared or thread-specific environments, and primitives to handle +multiple environments were also added.
+
+

+ +

THE NEW ENVIRONMENT MODEL
+

+ +

A frame is a table which maps (or binds) names to values. An +environment is a chained list of frames in which the interpreter works. +

+ +

For example the command:

+ +

(define x 7)

+ +

creates a binding between x and the value 7.

+ +

A typical environment looks like this:

+ +

+
+

+
+
+
+Each rectangle denotes a frame and inside it are the bindings it holds. +The rightmost rectangle is the global environment.
+

+ +

When a variable is evaluated, the interpreter first tries to find it +in the current frame. If a suitable binding can't be found, the interpreter +moves to the next frame in the environment and searched for a binding there.
+

+ +

In our example if we write x in the command line we'll get 12 +as the answer because all such computations take place at the global environment. +
+

+ +

A function application is always evaluated with respect to the environment +the in which it was defined. (A function "holds" its environment, +hence the name "closure") This means that if we write

+ +

(define (f) x)

+ +

and then

+ +

(f)

+ +

the result will be

+ +

12.
+
+
+
+
+

+
+

+
+In traditional SCHEME we have only one interpreter running at a time, so +at a given point of calculation there is only one environment. In Galapagos +multiple interpreters can run at the same time, and each of them has its +own environment.
+

+ +

Under Galapagos's environment model, every interpreter works on its +branch of an "environments tree", but can also evaluate an expression +in any other environment in the tree. If two interpreters have a shared +node on the tree, then from that point up (towards the global environment) +all the bindings are the same for the two interpreters. The global environment +is shared by all interpreters. If an interpreter changes the value of some +variable, the binding is changed in all other interpreters that have access +to the frame where the variable was declared. Obviously, caution should +be taken when writing to a shared variable.
+

+ +

As an example, if a user created two new threads, called A and B, and +then evaluated:

+ +

First thread> (define +x 7)

+ +

(define (f) ...)

+ +

Thread A> (define (g) +x)

+ +

Thread B> (define x 4) +

+ +

this is how the environment model would look like:
+

+ +


+

+ +

Now consider what happens when the user evaluates this:

+ +

Thread A> (set! f g) +

+ +


+
+

+ +

Now, evaluating (f) in thread B will call the function defined +in thread A. It will return 12 which is the value of x in f's environment. +If thread A defines a new x (using define), it will affect the result +of subsequent calls to f.
+

+ +

Sharing environments and frames are Galapagos's way of allowing shared +data. By default, however, most calculations are done at thread-specific +frames. (More on this subject in the next section). Primitives are supplied +to explicitly reference and manage environments: clone-environment +can create a copy of an environment (so changing a binding in one copy +does not alter the other); extend-environment and pop-environment +can add and remove frames to and from environments. More environment functions +are found in the next section of this document.
+

+ +

THREADS
+

+ +

A thread is a SCHEME interpreter. The base environment of a thread +is the thread's topmost environment. All forms entered at the thread's +console or as arguments to new-thread are evaluated in the base +environment. In traditional SCHEME there is only one thread of execution. +It is a single thread and its base environment is the global environment. +In Galapagos many interpreters can run concurrently, and each have its +own environment (changing dynamically as computation progresses) and a +base environment (which can be explicitly changed).
+

+ +

One thread is created by Galapagos upon startup. It is called the main +thread, and it lasts for the whole Galapagos session. Its base environment +is the global one - much like a traditional Scheme interpreter. Additional +threads can be created using new-thread. These have their base environment +set to a new environment, containing a single fresh frame pointing to the +global environment. Any calculation done at the new thread's console takes +place in this thread-local environment. However, if closure functions are +used, then their evaluation may take place at the global environment or +at some other thread's space, depending on where that function was defined. +
+

+ +

When a thread finishes the execution of its commands it terminates. +There are two exceptions to this rule:

+ +
    +
  1. The main thread can be only terminated by using quit-program. +
    2. + +
  2. A thread that is bound to the console will not terminate at the end +of execution but will wait for the next command input.
    3. +
+ +

Threads can communicate using the predicate tell-thread or by +using the asynchronous message-queues system described later. In addition, +SCM's arbiters were improved to be multithread safe. An arbiter +object can serve as a guard on a critical section (where only one thread +can work at a given time) of the program. The relevant primitves are make-arbiter, +try-arbiter, and release-arbiter.
+

+ +

Note: Galapagos supports Scheme's notation of continuations. +However, two restrictions apply:

+ +
    +
  1. Only "cheap" continuations are supported. That is, a continuation +can only be called when it is still active. This allows for continuations +to be used to implement exception handling, etc.
    2. + +
  2. Continuations can not cross thread boundaries. Also continuations, +like any other Scheme object, can be handled by any thread, they can only +be called from within the thread that created them. Trying to call a continuation +from a different thread will cause an error.
    3. +
+ +

CONSOLES
+

+ +

A console is a text window where the user can type commands (when +the interpreter is idle) and see output. A console has a name which can +be changed dynamically, which appears on its title bar. A thread may or +may not be bound to a console. Information printed by a non-bound thread +is lost; a non-bound thread waiting for input is stuck (unless provisions +were made to allow a new console to be created by means of inter-thread +communications.) If a non-bound thread has nothing to do, instead of waiting +for input like a bound thread, it will terminate.
+

+ +

The main thread is always bound to a console. To bind a thread to a +console use the command bind-to-console from within the thread.
+

+ +

DRAWING BOARDS
+

+ +

A board (window) is the graphical board on which the turtles and the +user draw. It is a bitmap on which the user can draw interactively, by +using the supplied GUI, or by creating turtles and instructing them to +do the drawings.
+

+ +

The controls of the graphical user interface are located on the toolbar. +The "shapes" of drawing are either a rectangle, a line or free +hand drawing. The user pen can have three widths which are found under +the User Pen menu. The numbers next to the sizes are the widths +in pixels.
+

+ +

The colors of the user pen can be changes either from the User Pen +menu or from the toolbar's color buttons. When choosing from a toolbar +button, the user can know exactly what color (in RGB format) is used.
+

+ +

Each window has a name which is written on its title bar which can be +changed using the rename-window! command. The board can be cleaned +from all drawings using the clear-window command.
+

+ +

Since the board is a bitmap it can be saved to a BMP file using the +save-bitmap command. A new background from a bitmap file can be +loaded using the load-bitmap command.
+

+ +

TURTLES
+

+ +

A turtle is an object which is connected to a certain board. Each turtle +has a pen with which it can draw on that board. The user can change the +state of the turtle's pen including giving it the color of the board's +background color (using the pen-erase! command). The pen will draw +when it is "down" and will not draw when it is "up". +Turtles can move between boards using the move-turtle-to-window +command.
+

+ +

Each turtle holds its location as the a pair of coordinates where 0,0 +is the upper left corner of the board and 800,600 is the bottom-right corner +of the board. The turtle's location can be changed by giving the turtle +commands such as forward!, backwards!, move-to! or by using the +move button from the toolbar.
+

+ +

A turtle also has a heading which is the direction it will move on the +forward! command. The heading is in degrees, 0 meaning upwards and +increasing clockwise, thus 90 means rightwards and so on. A turtle's heading +can be changed by commands such as right!, left!, and set-heading! +or interactively, by using the move button on the toolbar and pressing +the control key.
+

+ +

A turtle can be visible on the board or be hidden. When it is visible +the user can decide if it wants a "solid" or "hollow" +turtle using the make-hollow! and make-solid! commands.
+

+ +

A turtle is always connected to a certain board, which is the board +it is drawing on. To create a new turtle on a board use the make-turtle +or the clone-turtle commands. A new turtle (created with the make-turtle +command) will be black, solid, heading north and with it's pen down, in +the center of the board. A cloned turtle will have exactly the same inner +state as its parent.
+

+ +

A turtle can also look at the board and see other turtles or colors. +By using the command look the user can tell the turtle the area +in which to look and what to look in this area.

+ +

Example:

+ +

The command

+ +

(look t 50 20 '(0 0 0))

+ +

will cause the turtle t to look for black pixels in the area +in radius 50 from the turtle and 20 degrees to each side of the heading +line, shown here in blue:

+ +


+

+ +

INTERRUPTS (NOTIFICATIONS) +AND MESSAGE HANDLERS
+

+ +

A turtle can have interrupts. Each interrupt is defined in terms of +turtle's vision. Whenever a turtle starts or stops seeing a given target, +a predefined message is sent to the thread which asked the interrupt. The +user can determine if the interrupt will notify on every change (like a +"can see"- "can't see" toggle) or only when one change +happens (only "can see" or "can't see" toggle). A message +can be any valid SCHEME object.
+

+ +

Example:

+ +

The command

+ +

(turtle-notify t "I-see" "I-don't-see" 50 20 +color-black)

+ +

tells the turtle t that every time it sees the color black it +should send the message "I-see" and when it doesn't see +the color black any more it should send the message "I-don't-see". +

+ +

Below is an example of what messages (or no message) t will send +while it is moving forward, encountering two black lines on its way:
+
+
+

+ +


+
+If the interrupt was of kind "can see" (notify-when command) +only the "I-see" messages were sent, and if it was a the +"can't see" interrupt (notify-when-not command) only the +"I-can't-see" style messages were sent.
+

+ +

A special "user interrupt" is invoked when the user right-clicks +the turtle or a window. The notify-on-click command is used to enable +this.
+

+ +

A thread can tell the turtle to delete a certain interrupt using the +turtle-no-notify command. It can also tell the turtle to disable +all interrupts using the stop-notifying command.
+

+ +

In order to process the messages sent from a turtle's interrupt (or +from another thread, as presented later) the thread must install a message +handler which is a one argument function. If no handler is installed +the turtle's messages are lost. There can be only one handler per thread. +If the handler is installed then every time an interrupt is invoked, the +handler function in called with the message sent by the interrupt as its +argument.
+
+

+ +

Example:

+ +

We declare the function:

+ +

(define (my-print x) (write x) (newline))

+ +

and then install my-print as the current handler with:

+ +

(install-handler my-print)

+ +

from now on every message a turtle's interrupt sends will be printed +on screen. If my-print was installed in the previous example then +we would have seen:
+

+ +

"I-see"

+ +

"I-don't-see"

+ +

"I-see"
+

+ +

on the screen.
+

+ +

A good example to view the interrupts in action is to make a turtle +turn each time it sees a color and then let it wander aimlessly. Then use +the user pen to draw lines the turtle's way and watch it change direction. +See the PINGPONG.SCM file for a demo program.
+

+ +

The message-handler concept can be used as a mean of synchronous inter-thread +communications. The tell-thread functions sends a message to a thread, +which will be treated as an interrupt-generated message: It will cause +the thread's message handler function to be called with tell-thread's argument +as its own. This allows one thread to initiate a computation in a different +thread's environment and CPU space synchronously and without sharing environments. +
+

+ +

MESSAGE QUEUES
+

+ +

In order to let threads communicate between themselves asynchronously +a system of message queues was developed. A queue is an object which stores +and relieves messages, stored in FIFO (First In First Out) style, meaning +messages are read in the order of arrival to the queue. Supported messages +are pairs of type and body, both of which can be any valid SCHEME object. +Looking for messages of a certain type is also supported, allowing implementation +of more flexible communication schemes than plain FIFO.
+

+ +

A thread can check if there are any messages in a given queue, if it +does get-message without checking first if there are messages in +the queue it will wait a given time-out or forever if no time-out is given. +If by the end of the time-out no message were in the queue the result will +be false.
+

+ +

Example:

+ +

In this example a queue q is created then a message is posted +into the queue and read from it.
+

+ +

(define q (make-queue))

+ +

(post-message q (cons 'type-circus 'bozo-the-clown))

+ +

(define msg (get-message q))
+

+ +

now the command

+ +

(car msg)

+ +

will give

+ +

type-circus

+ +

and the command

+ +

(cdr msg)

+ +

will yield

+ +

bozo-the-clown.

+ + +

+

+
+ [TOP] + [PREV] + [PREV] + [PREV] +
+ + + + + + diff --git a/websites/www.cs.bgu.ac.il/~elad/GALAPAGOS/19991006050747/~elad/GALAPAGOS/background.html b/websites/www.cs.bgu.ac.il/~elad/GALAPAGOS/19991006050747/~elad/GALAPAGOS/background.html new file mode 100644 index 0000000..f606cb2 --- /dev/null +++ b/websites/www.cs.bgu.ac.il/~elad/GALAPAGOS/19991006050747/~elad/GALAPAGOS/background.html @@ -0,0 +1,130 @@ + + + + Galapagos - Background + + + + + +

+

+ [PREV] + [PREV] + [PREV] +
+
+

+

Background

+ + + +

+

+ +

SCHEME

+ +

Scheme is a dialect of Lisp that stresses conceptual elegance and simplicity. +It is specified in R4RS and IEEE standard P1178. Scheme is much smaller +than Common Lisp; the specification is about 50 pages, compared to Common +Lisp's 1300 page draft standard. (See the Lisp FAQ for details on standards +for Common Lisp.) Advocates of Scheme often find it amusing that the entire +Scheme standard is shorter than the index to Guy Steele's "Common +Lisp: the Language, 2nd Edition".
+

+ +

Scheme is often used in computer science curricula and programming language +research, due to its ability to represent many programming abstractions +with its simple primitives.
+

+ +

There are a lot of traditional SCHEME interpreter available such as +Chez, ELK 2.1, GAMBIT, MITScheme, scheme->C, Scheme48, T3.1, VSCM and +Scm4e. Many free Scheme implementations (as well as SCM) are available +from swiss-ftp.ai.mit.edu [18.43.0.246].
+

+ +

Galapagos is built over the SCM interpreter version 4e4 written by Aubrey +Jaffer <jaffer@ai.mit.edu>.
+
+
+

+ +

LOGO AND TURTLE GEOMETRY
+

+ +

LOGO is a programming language designed for use by learners, including +children. It is a dialect of LISP which has a more natural syntax, using +infix arithmetics and (almost) no parentheses. LOGO features a "turtle" +which can be instructed to move across the screen and draw shapes. This +became known as "Turtle Graphics" or "Turtle Geometry" +- a geometry that describes paths "from within" rather than "from +outside" or "from above." For example, "turn right" +means turn right relative to whatever direction you were heading before; +by contrast, "turn east" specifies an apparently absolute direction. +A Logo user or program manipulates the graphical turtle by telling it to +move forward or back some number of steps, or by telling it to turn left +or right some number of degrees.
+

+ +

Turtle geometry has two major advantages. One is that many paths are +more simply described in relative than in absolute terms. For example, +it's easy to indicate the absolute coordinates of the corners of a square +with vertical and horizontal sides, but it's not so easy to find the corners +of an inclined square. In turtle geometry the same commands (go forward, +turn right 90 degrees, etc.) work for squares with any orientation. +The second advantage is pedagogic rather than computational: turtle geometry +is compatible with a learner's own experience of moving in the world - +it's "body syntonic."
+

+ +

OBJECTIVES
+

+ +

The two major goals behind Galapagos were:
+

+ +

First, we wanted to create an environment suitable for teaching programming, +patterned after Logo's environment and its easy-to-understand, easy-to-use +turtle geometry. We chose Scheme as the programming language because of +its educational value, as noted before. We added Turtle Graphics because +of its ability to visualize computations, and thus help understanding them +better.
+

+ +

Second, we wanted to add parallel programming. The importance of multiprocessor +machines and of multithreading is becoming more apparent every day, and +so is the need for tools to help understanding parallel programming paradigms. +By extending Scheme to be multithreaded, we wanted to create such a tool.
+

+ +

AVAILABILITY
+

+ +

Galapagos was developed to run under Windows 95, and should work under +Window NT as well. (It uses 32-bit specific code so Win32s is not enough +to run Galapagos). Both binary and source are available at the +homepage:
+

+ +

+http://www.cs.bgu.ac.il/~elad/GALAPAGOS + +

+ + +

+

+
+ [TOP] + [PREV] + [PREV] + [PREV] +
+ + diff --git a/websites/www.cs.bgu.ac.il/~elad/GALAPAGOS/19991006061546/~elad/GALAPAGOS/bib.html b/websites/www.cs.bgu.ac.il/~elad/GALAPAGOS/19991006061546/~elad/GALAPAGOS/bib.html new file mode 100644 index 0000000..52609ac --- /dev/null +++ b/websites/www.cs.bgu.ac.il/~elad/GALAPAGOS/19991006061546/~elad/GALAPAGOS/bib.html @@ -0,0 +1,81 @@ + + + + Galapagos - Bibliography + + + + +
+ [PREV] +
+
+

+ +

BIBLIOGRAPHY

+
+ +
    +
  • The +SCHEME FAQ,
    +http://www.cs.cmu.edu:8001/Web/Groups/AI/html/faqs/lang/scheme/top.html +

    • + +

  • The LOGO FAQ,
    +ftp://cher.media.mit.edu/pub/logo/FAQ +

    • + +

  • SCM manual version 4e4, Aubrey Jaffer. SCM 4e4 is available +at:
    +ftp://ftp-swiss.ai.mit.edu/pub/scm/scm4e4.tar.gz +

    • + +

  • Structure and interpretation of computer programs, +Harold Ableson and Gerald J. Sussman with Julie Sussman. +

    • + +

  • Garbage Collection, Andrew W. Appel; appeard +in Topics in Advanced Language Implementation, edited by Peter Lee.

    • +

+ +

+

+

LINKS

+

+

+

+

+

+
+ [PREV] +
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Welcome to
+GALAPAGOS

+ +Galapagos is an interactive multithreaded Scheme interpreter with turtle +graphics for Windows 95. It is built around the SCM interpreter, and it +provides multiple interpreters, threads, turtles, and drawing boards, all +running concurrently using WIN32's multithreading abilities, and freely +available. + +

+

+

+

+

+Spring 1997

+Graduation project

+Department of Math & Computer Science,

+Ben-Gurion University of the Negev

+
+Written by Elad Eyal and Miki +Tebeka.
+
+Supervisor: Dr. Michael Elhadad +
+

+

+

+

+ +

TABLE OF CONTENTS

+ + + +

+ +
+ +

DOWNLOAD CENTER

+

+

GNU LICENSE. COPYRIGHTED. PROVIDED "AS IS". NO +WARRANTIES OR LIABILITIES. ETC.
+

+

+500K gps10bin.zip - Executable and required Scheme libraries (SLIB)
+700K gps10src.zip - Same with all source code
+400K mfc40dll.zip - You might need this MFC40.DLL if you +don't have it already.
+ + diff --git a/websites/www.cs.bgu.ac.il/~elad/GALAPAGOS/20010608213604/~elad/GALAPAGOS/background.html b/websites/www.cs.bgu.ac.il/~elad/GALAPAGOS/20010608213604/~elad/GALAPAGOS/background.html new file mode 100644 index 0000000..f606cb2 --- /dev/null +++ b/websites/www.cs.bgu.ac.il/~elad/GALAPAGOS/20010608213604/~elad/GALAPAGOS/background.html @@ -0,0 +1,130 @@ + + + + Galapagos - Background + + + + + +

+

+ [PREV] + [PREV] + [PREV] +
+
+

+

Background

+ + + +

+

+ +

SCHEME

+ +

Scheme is a dialect of Lisp that stresses conceptual elegance and simplicity. +It is specified in R4RS and IEEE standard P1178. Scheme is much smaller +than Common Lisp; the specification is about 50 pages, compared to Common +Lisp's 1300 page draft standard. (See the Lisp FAQ for details on standards +for Common Lisp.) Advocates of Scheme often find it amusing that the entire +Scheme standard is shorter than the index to Guy Steele's "Common +Lisp: the Language, 2nd Edition".
+

+ +

Scheme is often used in computer science curricula and programming language +research, due to its ability to represent many programming abstractions +with its simple primitives.
+

+ +

There are a lot of traditional SCHEME interpreter available such as +Chez, ELK 2.1, GAMBIT, MITScheme, scheme->C, Scheme48, T3.1, VSCM and +Scm4e. Many free Scheme implementations (as well as SCM) are available +from swiss-ftp.ai.mit.edu [18.43.0.246].
+

+ +

Galapagos is built over the SCM interpreter version 4e4 written by Aubrey +Jaffer <jaffer@ai.mit.edu>.
+
+
+

+ +

LOGO AND TURTLE GEOMETRY
+

+ +

LOGO is a programming language designed for use by learners, including +children. It is a dialect of LISP which has a more natural syntax, using +infix arithmetics and (almost) no parentheses. LOGO features a "turtle" +which can be instructed to move across the screen and draw shapes. This +became known as "Turtle Graphics" or "Turtle Geometry" +- a geometry that describes paths "from within" rather than "from +outside" or "from above." For example, "turn right" +means turn right relative to whatever direction you were heading before; +by contrast, "turn east" specifies an apparently absolute direction. +A Logo user or program manipulates the graphical turtle by telling it to +move forward or back some number of steps, or by telling it to turn left +or right some number of degrees.
+

+ +

Turtle geometry has two major advantages. One is that many paths are +more simply described in relative than in absolute terms. For example, +it's easy to indicate the absolute coordinates of the corners of a square +with vertical and horizontal sides, but it's not so easy to find the corners +of an inclined square. In turtle geometry the same commands (go forward, +turn right 90 degrees, etc.) work for squares with any orientation. +The second advantage is pedagogic rather than computational: turtle geometry +is compatible with a learner's own experience of moving in the world - +it's "body syntonic."
+

+ +

OBJECTIVES
+

+ +

The two major goals behind Galapagos were:
+

+ +

First, we wanted to create an environment suitable for teaching programming, +patterned after Logo's environment and its easy-to-understand, easy-to-use +turtle geometry. We chose Scheme as the programming language because of +its educational value, as noted before. We added Turtle Graphics because +of its ability to visualize computations, and thus help understanding them +better.
+

+ +

Second, we wanted to add parallel programming. The importance of multiprocessor +machines and of multithreading is becoming more apparent every day, and +so is the need for tools to help understanding parallel programming paradigms. +By extending Scheme to be multithreaded, we wanted to create such a tool.
+

+ +

AVAILABILITY
+

+ +

Galapagos was developed to run under Windows 95, and should work under +Window NT as well. (It uses 32-bit specific code so Win32s is not enough +to run Galapagos). Both binary and source are available at the +homepage:
+

+ +

+http://www.cs.bgu.ac.il/~elad/GALAPAGOS + +

+ + +

+

+
+ [TOP] + [PREV] + [PREV] + [PREV] +
+ + diff --git a/websites/www.cs.bgu.ac.il/~elad/GALAPAGOS/20010608214537/~elad/GALAPAGOS/bib.html b/websites/www.cs.bgu.ac.il/~elad/GALAPAGOS/20010608214537/~elad/GALAPAGOS/bib.html new file mode 100644 index 0000000..52609ac --- /dev/null +++ b/websites/www.cs.bgu.ac.il/~elad/GALAPAGOS/20010608214537/~elad/GALAPAGOS/bib.html @@ -0,0 +1,81 @@ + + + + Galapagos - Bibliography + + + + +
+ [PREV] +
+
+

+ +

BIBLIOGRAPHY

+
+ +
    +
  • The +SCHEME FAQ,
    +http://www.cs.cmu.edu:8001/Web/Groups/AI/html/faqs/lang/scheme/top.html +

    • + +

  • The LOGO FAQ,
    +ftp://cher.media.mit.edu/pub/logo/FAQ +

    • + +

  • SCM manual version 4e4, Aubrey Jaffer. SCM 4e4 is available +at:
    +ftp://ftp-swiss.ai.mit.edu/pub/scm/scm4e4.tar.gz +

    • + +

  • Structure and interpretation of computer programs, +Harold Ableson and Gerald J. Sussman with Julie Sussman. +

    • + +

  • Garbage Collection, Andrew W. Appel; appeard +in Topics in Advanced Language Implementation, edited by Peter Lee.

    • +

+ +

+

+

LINKS

+

+

+

+

+

+
+ [PREV] +
+ + + + + diff --git a/websites/www.cs.bgu.ac.il/~elad/GALAPAGOS/20010608215359/~elad/GALAPAGOS/extensions.html b/websites/www.cs.bgu.ac.il/~elad/GALAPAGOS/20010608215359/~elad/GALAPAGOS/extensions.html new file mode 100644 index 0000000..67d97f1 --- /dev/null +++ b/websites/www.cs.bgu.ac.il/~elad/GALAPAGOS/20010608215359/~elad/GALAPAGOS/extensions.html @@ -0,0 +1,493 @@ + + + + Galapagos - Scheme Extensions + + + + + +
+ [PREV] + [PREV] + [PREV] +
+
+

+ +

SCHEME EXTENSIONS
+

+ + + +

+

+ +

We have extended Scheme in two main +directions: Turtle graphics and multithreading:
+

+ +

The turtle object lives on a board on which it can move and draw. +A turtle can also communicate with the board and "see" colors +or other turtles. Galapagos Scheme provides a set of primitives to create +and manage such turtles and the boards they live on.
+

+ +

A set of additional primitives enable the programmer to create multiple +interpreters that run concurrently. The environment model was extended +to support shared or thread-specific environments, and primitives to handle +multiple environments were also added.
+
+

+ +

THE NEW ENVIRONMENT MODEL
+

+ +

A frame is a table which maps (or binds) names to values. An +environment is a chained list of frames in which the interpreter works. +

+ +

For example the command:

+ +

(define x 7)

+ +

creates a binding between x and the value 7.

+ +

A typical environment looks like this:

+ +

+
+

+
+
+
+Each rectangle denotes a frame and inside it are the bindings it holds. +The rightmost rectangle is the global environment.
+

+ +

When a variable is evaluated, the interpreter first tries to find it +in the current frame. If a suitable binding can't be found, the interpreter +moves to the next frame in the environment and searched for a binding there.
+

+ +

In our example if we write x in the command line we'll get 12 +as the answer because all such computations take place at the global environment. +
+

+ +

A function application is always evaluated with respect to the environment +the in which it was defined. (A function "holds" its environment, +hence the name "closure") This means that if we write

+ +

(define (f) x)

+ +

and then

+ +

(f)

+ +

the result will be

+ +

12.
+
+
+
+
+

+
+

+
+In traditional SCHEME we have only one interpreter running at a time, so +at a given point of calculation there is only one environment. In Galapagos +multiple interpreters can run at the same time, and each of them has its +own environment.
+

+ +

Under Galapagos's environment model, every interpreter works on its +branch of an "environments tree", but can also evaluate an expression +in any other environment in the tree. If two interpreters have a shared +node on the tree, then from that point up (towards the global environment) +all the bindings are the same for the two interpreters. The global environment +is shared by all interpreters. If an interpreter changes the value of some +variable, the binding is changed in all other interpreters that have access +to the frame where the variable was declared. Obviously, caution should +be taken when writing to a shared variable.
+

+ +

As an example, if a user created two new threads, called A and B, and +then evaluated:

+ +

First thread> (define +x 7)

+ +

(define (f) ...)

+ +

Thread A> (define (g) +x)

+ +

Thread B> (define x 4) +

+ +

this is how the environment model would look like:
+

+ +


+

+ +

Now consider what happens when the user evaluates this:

+ +

Thread A> (set! f g) +

+ +


+
+

+ +

Now, evaluating (f) in thread B will call the function defined +in thread A. It will return 12 which is the value of x in f's environment. +If thread A defines a new x (using define), it will affect the result +of subsequent calls to f.
+

+ +

Sharing environments and frames are Galapagos's way of allowing shared +data. By default, however, most calculations are done at thread-specific +frames. (More on this subject in the next section). Primitives are supplied +to explicitly reference and manage environments: clone-environment +can create a copy of an environment (so changing a binding in one copy +does not alter the other); extend-environment and pop-environment +can add and remove frames to and from environments. More environment functions +are found in the next section of this document.
+

+ +

THREADS
+

+ +

A thread is a SCHEME interpreter. The base environment of a thread +is the thread's topmost environment. All forms entered at the thread's +console or as arguments to new-thread are evaluated in the base +environment. In traditional SCHEME there is only one thread of execution. +It is a single thread and its base environment is the global environment. +In Galapagos many interpreters can run concurrently, and each have its +own environment (changing dynamically as computation progresses) and a +base environment (which can be explicitly changed).
+

+ +

One thread is created by Galapagos upon startup. It is called the main +thread, and it lasts for the whole Galapagos session. Its base environment +is the global one - much like a traditional Scheme interpreter. Additional +threads can be created using new-thread. These have their base environment +set to a new environment, containing a single fresh frame pointing to the +global environment. Any calculation done at the new thread's console takes +place in this thread-local environment. However, if closure functions are +used, then their evaluation may take place at the global environment or +at some other thread's space, depending on where that function was defined. +
+

+ +

When a thread finishes the execution of its commands it terminates. +There are two exceptions to this rule:

+ +
    +
  1. The main thread can be only terminated by using quit-program. +
    2. + +
  2. A thread that is bound to the console will not terminate at the end +of execution but will wait for the next command input.
    3. +
+ +

Threads can communicate using the predicate tell-thread or by +using the asynchronous message-queues system described later. In addition, +SCM's arbiters were improved to be multithread safe. An arbiter +object can serve as a guard on a critical section (where only one thread +can work at a given time) of the program. The relevant primitves are make-arbiter, +try-arbiter, and release-arbiter.
+

+ +

Note: Galapagos supports Scheme's notation of continuations. +However, two restrictions apply:

+ +
    +
  1. Only "cheap" continuations are supported. That is, a continuation +can only be called when it is still active. This allows for continuations +to be used to implement exception handling, etc.
    2. + +
  2. Continuations can not cross thread boundaries. Also continuations, +like any other Scheme object, can be handled by any thread, they can only +be called from within the thread that created them. Trying to call a continuation +from a different thread will cause an error.
    3. +
+ +

CONSOLES
+

+ +

A console is a text window where the user can type commands (when +the interpreter is idle) and see output. A console has a name which can +be changed dynamically, which appears on its title bar. A thread may or +may not be bound to a console. Information printed by a non-bound thread +is lost; a non-bound thread waiting for input is stuck (unless provisions +were made to allow a new console to be created by means of inter-thread +communications.) If a non-bound thread has nothing to do, instead of waiting +for input like a bound thread, it will terminate.
+

+ +

The main thread is always bound to a console. To bind a thread to a +console use the command bind-to-console from within the thread.
+

+ +

DRAWING BOARDS
+

+ +

A board (window) is the graphical board on which the turtles and the +user draw. It is a bitmap on which the user can draw interactively, by +using the supplied GUI, or by creating turtles and instructing them to +do the drawings.
+

+ +

The controls of the graphical user interface are located on the toolbar. +The "shapes" of drawing are either a rectangle, a line or free +hand drawing. The user pen can have three widths which are found under +the User Pen menu. The numbers next to the sizes are the widths +in pixels.
+

+ +

The colors of the user pen can be changes either from the User Pen +menu or from the toolbar's color buttons. When choosing from a toolbar +button, the user can know exactly what color (in RGB format) is used.
+

+ +

Each window has a name which is written on its title bar which can be +changed using the rename-window! command. The board can be cleaned +from all drawings using the clear-window command.
+

+ +

Since the board is a bitmap it can be saved to a BMP file using the +save-bitmap command. A new background from a bitmap file can be +loaded using the load-bitmap command.
+

+ +

TURTLES
+

+ +

A turtle is an object which is connected to a certain board. Each turtle +has a pen with which it can draw on that board. The user can change the +state of the turtle's pen including giving it the color of the board's +background color (using the pen-erase! command). The pen will draw +when it is "down" and will not draw when it is "up". +Turtles can move between boards using the move-turtle-to-window +command.
+

+ +

Each turtle holds its location as the a pair of coordinates where 0,0 +is the upper left corner of the board and 800,600 is the bottom-right corner +of the board. The turtle's location can be changed by giving the turtle +commands such as forward!, backwards!, move-to! or by using the +move button from the toolbar.
+

+ +

A turtle also has a heading which is the direction it will move on the +forward! command. The heading is in degrees, 0 meaning upwards and +increasing clockwise, thus 90 means rightwards and so on. A turtle's heading +can be changed by commands such as right!, left!, and set-heading! +or interactively, by using the move button on the toolbar and pressing +the control key.
+

+ +

A turtle can be visible on the board or be hidden. When it is visible +the user can decide if it wants a "solid" or "hollow" +turtle using the make-hollow! and make-solid! commands.
+

+ +

A turtle is always connected to a certain board, which is the board +it is drawing on. To create a new turtle on a board use the make-turtle +or the clone-turtle commands. A new turtle (created with the make-turtle +command) will be black, solid, heading north and with it's pen down, in +the center of the board. A cloned turtle will have exactly the same inner +state as its parent.
+

+ +

A turtle can also look at the board and see other turtles or colors. +By using the command look the user can tell the turtle the area +in which to look and what to look in this area.

+ +

Example:

+ +

The command

+ +

(look t 50 20 '(0 0 0))

+ +

will cause the turtle t to look for black pixels in the area +in radius 50 from the turtle and 20 degrees to each side of the heading +line, shown here in blue:

+ +


+

+ +

INTERRUPTS (NOTIFICATIONS) +AND MESSAGE HANDLERS
+

+ +

A turtle can have interrupts. Each interrupt is defined in terms of +turtle's vision. Whenever a turtle starts or stops seeing a given target, +a predefined message is sent to the thread which asked the interrupt. The +user can determine if the interrupt will notify on every change (like a +"can see"- "can't see" toggle) or only when one change +happens (only "can see" or "can't see" toggle). A message +can be any valid SCHEME object.
+

+ +

Example:

+ +

The command

+ +

(turtle-notify t "I-see" "I-don't-see" 50 20 +color-black)

+ +

tells the turtle t that every time it sees the color black it +should send the message "I-see" and when it doesn't see +the color black any more it should send the message "I-don't-see". +

+ +

Below is an example of what messages (or no message) t will send +while it is moving forward, encountering two black lines on its way:
+
+
+

+ +


+
+If the interrupt was of kind "can see" (notify-when command) +only the "I-see" messages were sent, and if it was a the +"can't see" interrupt (notify-when-not command) only the +"I-can't-see" style messages were sent.
+

+ +

A special "user interrupt" is invoked when the user right-clicks +the turtle or a window. The notify-on-click command is used to enable +this.
+

+ +

A thread can tell the turtle to delete a certain interrupt using the +turtle-no-notify command. It can also tell the turtle to disable +all interrupts using the stop-notifying command.
+

+ +

In order to process the messages sent from a turtle's interrupt (or +from another thread, as presented later) the thread must install a message +handler which is a one argument function. If no handler is installed +the turtle's messages are lost. There can be only one handler per thread. +If the handler is installed then every time an interrupt is invoked, the +handler function in called with the message sent by the interrupt as its +argument.
+
+

+ +

Example:

+ +

We declare the function:

+ +

(define (my-print x) (write x) (newline))

+ +

and then install my-print as the current handler with:

+ +

(install-handler my-print)

+ +

from now on every message a turtle's interrupt sends will be printed +on screen. If my-print was installed in the previous example then +we would have seen:
+

+ +

"I-see"

+ +

"I-don't-see"

+ +

"I-see"
+

+ +

on the screen.
+

+ +

A good example to view the interrupts in action is to make a turtle +turn each time it sees a color and then let it wander aimlessly. Then use +the user pen to draw lines the turtle's way and watch it change direction. +See the PINGPONG.SCM file for a demo program.
+

+ +

The message-handler concept can be used as a mean of synchronous inter-thread +communications. The tell-thread functions sends a message to a thread, +which will be treated as an interrupt-generated message: It will cause +the thread's message handler function to be called with tell-thread's argument +as its own. This allows one thread to initiate a computation in a different +thread's environment and CPU space synchronously and without sharing environments. +
+

+ +

MESSAGE QUEUES
+

+ +

In order to let threads communicate between themselves asynchronously +a system of message queues was developed. A queue is an object which stores +and relieves messages, stored in FIFO (First In First Out) style, meaning +messages are read in the order of arrival to the queue. Supported messages +are pairs of type and body, both of which can be any valid SCHEME object. +Looking for messages of a certain type is also supported, allowing implementation +of more flexible communication schemes than plain FIFO.
+

+ +

A thread can check if there are any messages in a given queue, if it +does get-message without checking first if there are messages in +the queue it will wait a given time-out or forever if no time-out is given. +If by the end of the time-out no message were in the queue the result will +be false.
+

+ +

Example:

+ +

In this example a queue q is created then a message is posted +into the queue and read from it.
+

+ +

(define q (make-queue))

+ +

(post-message q (cons 'type-circus 'bozo-the-clown))

+ +

(define msg (get-message q))
+

+ +

now the command

+ +

(car msg)

+ +

will give

+ +

type-circus

+ +

and the command

+ +

(cdr msg)

+ +

will yield

+ +

bozo-the-clown.

+ + +

+

+
+ [TOP] + [PREV] + [PREV] + [PREV] +
+ + + + + + diff --git a/websites/www.cs.bgu.ac.il/~elad/GALAPAGOS/20010608220120/~elad/GALAPAGOS/gui.html b/websites/www.cs.bgu.ac.il/~elad/GALAPAGOS/20010608220120/~elad/GALAPAGOS/gui.html new file mode 100644 index 0000000..a6c0244 --- /dev/null +++ b/websites/www.cs.bgu.ac.il/~elad/GALAPAGOS/20010608220120/~elad/GALAPAGOS/gui.html @@ -0,0 +1,73 @@ + + + + Galapago - GUI + + + + + +
+ [PREV] + [PREV] + [PREV] +
+
+

+ +

THE INTERACTIVE GUI

+
+

In order to make Galapagos more fun to learn with, an interactive GUI +(Graphical User Interface) is provided. Users can make changes on the board +while a computation is in progress and effect its execution. Drawing tools +enable the user to draw on the board while a program is being executed. +If a line is drawn in front of a turtle which has a relevant interrupt, +the interrupt will be invoked if needed.
+

+ +

The user has a special user pen that can draw line, rectangles +or free hand. These modes are available from the toolbar. The User's pen +width and color can be modified using the User Pen menu or the toolbar.
+

+ +

Color buttons are provided on the toolbar to give a known RGB color +to the user pen. It is useful when the user draw an object on the board +and wants a turtle to see this object. The colors are:

+ +

White - (255 255 255)

+ +

Black - (0 0 0)

+ +

Blue - (0 0 255)

+ +

Red - (255 0 0)

+ +

Green - (0 255 0)

+ +

Yellow - (255 255 0)
+

+ +

Another option available is changing a turtle's heading and position, +using the Move Turtle button:

+ +


+

+ +

If this button is pressed then a turtle can be dragged to a new location +simply by dragging it with the mouse. In order to change the turtle's heading, +hold down a control key and move the move towards the desired location, +the turtle will follow the movement of the mouse.

+ +

+

+
+ [TOP] + [PREV] + [PREV] + [PREV] +
+ + + + + diff --git a/websites/www.cs.bgu.ac.il/~elad/GALAPAGOS/20010608220848/~elad/GALAPAGOS/implementation.html b/websites/www.cs.bgu.ac.il/~elad/GALAPAGOS/20010608220848/~elad/GALAPAGOS/implementation.html new file mode 100644 index 0000000..822f9b9 --- /dev/null +++ b/websites/www.cs.bgu.ac.il/~elad/GALAPAGOS/20010608220848/~elad/GALAPAGOS/implementation.html @@ -0,0 +1,393 @@ + + + + Galapagos - Implementation + + + + + +
+ [PREV] + [PREV] + [PREV] +
+
+

+ +

IMPLEMENTATION

+ + + +
+

Galapagos was written using Microsoft Visual C++, and is designed to +run under Windows 95. We chose Windows 95 because it seems to have the +largest potential Galapagos users base. The following sections describe +some implementation details of Galapagos.
+

+ +

The SCM interpreter we used as a base is written in C. Most of the original +code we added was written in C++. The parts we used from SCM are almost +identical to the original. In fact, by changing the scmconfig.h file (which +contain machine-specific configuration) and #defining THREAD to be null, +the C files should become equivalent to the sources we used.
+

+ +

We have implemented two MT-safe FIFO message queue classes. Both will +block when trying to read from an empty queue. CMsgQx, the extended +message queue, supports the same interface as the one provided in Scheme, +plus an additional support for "Urgent Messages". These take +precedence over all other messages. CMessageQueue is message queue +with exactly the same interface as the Scheme level message queues, but +which contain internal logic to handle "Urgent" messages used +to deal with cases where synchronous respond is needed, such as I/O, Garbage +collection, and Scheme-level inter-thread communications.
+

+ +

FITTING SCM INTO WINDOWS
+

+ +

Galapagos is based on SCM, which is a single-thread, read-evaluate-print-loop +(repl) based Scheme interpreter. The most important issue in migrating +SCM was how to maintain the interpreter's natural repl-based approach, +yet allow for multiple threads to interact, and for Windows messages to +be processed quickly.
+

+ +

We used WIN32's multithreading capabilities to solve these problems. +A single thread handles all aspects of the GUI - in a sense, "all +that is Windows": graphic boards, turtles, consoles, menus and so +on. Each interpreter runs in a thread of its own, interacting with the +GUI using a message queue similar to the one provided at the Scheme level.
+

+ +


+

+ +

The GUI thread manages both commands received from the OS and from the +different interpreters running on their own threads. To ensure as fast +responses as possible, priorities are used: OS messages (such as windows +updates and input devices) gets highest priority; Console (text messages) +come second, and graphics messages are last. This allows the interpreters +to run interactively in a satisfactory manner.
+

+ +

SCM interpreter threads each run in the old-fashion repl mode. When +a computation is over, the interpreter blocks until new input comes from +the GUI thread. All blocking functions were modified to allow synchronous +messages (such as the one generated by tell-thread) to work. In +addition, SCM's "poll routine" is used to force checking for +such messages even during computations.
+

+ +

An additional thread is used for Garbage Collection. It is described +in detail in the section dealing with garbage collection.
+

+ +

GARBAGE COLLECTION

+ +

In this section we will briefly describe SCM's garbage collector, and +then discuss the modifications done to adapt it to Galapagos's multithreading +computations. It should be noted that the garbage collector used is a portable +garbage collector taken from "SCHEME IN ONE DEFUN, BUT IN C THIS TIME", +by George J Carrette <gjc@world.std.com>.
+

+ +

SCM uses a conservative Mark & Sweep garbage collector (GC). All +Scheme data objects share some common configuration (called "cells"): +They are 8-byte aligned; they reside is specially-allocated memory segments +(called hplims); they are the size of two pointers (so a scheme cons is +exactly a cell); and they contain a special GC bit used by the garbage +collector. This bit is 0 during actual computations. When a new cell is +needed and all the hplims are used, garbage collection is initiated. If +it does not free enough space to pass a certain threshold, a new hplim +is allocated.
+

+ +

The first stage in garbage collection is marking all cells which are +not to be deleted. Some terminology might be helpful here:
+

+ +
    +
  • A cell (or any data object) is called alive if it may +in some way influence the future of the computation. Needless to say, discovering +which cells are alive and which are not is impossible, because of the very +nature of the future.
    • +
+ +
    +
  • A cell is called reachable if the computation can read +its value. Some data is immediately reachable: The data on the machine's +stack or in the CPU registers, for example; some interpreters store some +information in a fixed location so it's permanently reachable. In SCM the +array sys_protects[] is used for +this propose. The set of reachable cells is the union of all immediately +reachable cells, and all those cells pointed by reachable cells, recursively. +
    • +
+ +

Obviously, all unreachable data is dead. Conservative garbage collectors +treat all reachable data as alive.
+

+ +

The Mark stage of the garbage collector scans the sys_protects[] +array and the machine's stack and registers for anything that looks like +a valid cell. All cell pointer have their 3 least significant bits zero, +and are in one of few known ranges (the hplims). The garbage collector +searches for anything matching a cell's bit pattern, and treats it as an +immediately reachable cell pointer. In some cases, this may mean an integer, +for example, happens to match the binary pattern and thus be interpreted +as a cell pointer. However, this will only mean some cell or cells are +marked as reachable though they are not such. Because of the uniform structure +of the cell and its limited range of possible locations, such an accident +is guarantied not to corrupt memory. Furthermore, if we accept the assumption +that integers are usually relatively small, and memory addresses are relatively +big, we conclude that such accidents are not very likely to happen often +anyway.
+

+ +

During mark stage, the garbage collector recursively finds (a superset +of) all live cells, and marks them by setting their special GC bit to 1. +The second stage is the Sweep stage, in which all the hplims are scanned +linearly, and every cell which is not marked is recognized as dead, and +as such is reclaimed as free. Marked cells get unmarked so they are ready +for the next garbage collection.
+

+ +

Mark & Sweep garbage collection has two main disadvantages: One, +that it requires all computation to stop while garbage collection is in +progress. In Galapagos, since all threads use a shared memory heap, it +means all threads must synchronize and halt while garbage is collected. +Second, Mark & Sweep is very likely to cause memory fragmentation. +However, since cells are equally sized, fragmentation is only rarely a +problem.
+

+ +

We chose to stick with Mark & Sweep in Galapagos because of its +two major advantages: Simplicity and efficiency. Mark & Sweep GC does +not affect computation speed, because direct pointers are used. Most concurrent +garbage collectors work by making all pointers indirect, which may slow +computations down considerably. The need to halt all threads for GC is +accepted. Since memory is shared, it would only be fair to stop all threads +when GC is needed: Threads will probably halt anyway since cells are allocated +continuously during computations.
+

+ +

Two major issues are introduced when trying to multithread the garbage +collector. One is the synchronization of the different threads, which run +almost completely unaware one of the other; the second is the need to mark +data from every thread's specific stack, registers, and sys_protects[]. +We solved these two issues by combining them to one.
+

+ +

The intuitive approach might be to let each thread mark its own information, +and then sweep centrally. However, since synchronization of threads is +mandatory, letting every thread mark its own data will lead only to redundant +marking and to excessive context switches, since each threads has to become +active. Therefore we created the "Garbage Collection daemon" +(GCd), which runs in a distinct thread and lasts for the whole Galapagos +session. The GCd is not an interpreter, but a mechanism which keeps track +of live threads and their need of GC. The GCd thread is always blocked, +except when a thread notifies it on its birth or death, or when a thread +indicates the need for garbage collection. Since the GC daemon is blocked +whenever it is not needed, and then becomes the exclusive running thread +during actual GC (with the exception of the GUI thread), its existence +does not hurt performance.
+

+ +

To explain how the GCd synchronizes all threads, let us examine the +three-way protocol involved. freelist +is a global pointer which holds a linked list of free cells - it can be +either a cell pointer, a value indicating "busy" (thus implementing +busy/wait protection over it) or "end of memory" which is found +at the end of the linked list. MIB stands for Memory Information +Block, which is a block of memory containing all of a thread's +immediately reachable data.
+

+ +

GCd scenario: GCd is blocked until a threads sends a GC +request.

+ +
    +
  1. GCd scans through its list of active threads, and sends each a MIB +request.
    2. + +
  2. It then blocks until all MIB blocks are received. GCd ignores further +GC request messages it get.
    3. + +
  3. At this point all threads are blocked. The GCd has gained, therefore, +exclusive access to the hplims. The GCd now marks all reachable cells, +inspecting each MIB block for immediately reachable cells and proceeding +recursively. Then, it sweeps.
    4. + +
  4. If needed, the GCd allocated a fresh hplim.
    5. + +
  5. GCd sends every thread a message allowing it to resume. Then it blocks +waiting for the next time.
    6. +
+ +

Scenario 1: A thread needs to allocate a cell but can't. +

+ +
    +
  1. The thread sends GCd a GC request message.
    2. + +
  2. Then it suspends until GCd sends it an MIB request.
    3. + +
  3. When one arrives, the thread generates and sends a MIB block to the +GCd.
    4. + +
  4. And blocks again until GCd notifies it that GC is done.
    5. + +
  5. At this point free cells are available and the computation can resume. +
    6. +
+ +

Scenario 2: A thread receives a MIB request. This +may happen within a computation or when considered otherwise blocked - +waiting for input, for example.

+ +
    +
  1. The thread generates and sends a MIB block to the GCd.
    2. + +
  2. And blocks until GCd notifies it that GC is done.
    3. +
+ +

The important thing to note about this protocol is its indifference +to the GC "initiator". Several threads can "initiate" +GC, and each request is "satisfied", although of course only +one GC takes place. The GCd itself is unaware of the initiating thread +identity, and completely ignores any further GC requests. It treats all +threads identically. This is important because it allows each thread meeting +a low memory condition to initiate GC immediately. This is in fact the +mechanism which saves us from explicitly checking for a third-party GC +request during computation: If a thread runs out of memory, the freelist +variable is kept at "out of memory" state, causing any other +thread trying to allocate memory to initiate GC as well. This simplifies +the GC protocol (technically, if not conceptually), and does it with almost +no affect on computation speed.
+

+ +

BOARDS
+

+ +

A board or a view as it called in MFC is the environment where a turtle +moves and interact with. It hold two main data structures. The first is +the bitmap of the drawing. It is a 800X600 bitmap. Every time a turtle +draws on the board it makes its pen the active pen on the board and draws +on it. Every time the picture needs refreshing (as signaled by the operating +system) it is the board's duty to copy the relevant section from the bitmap +to the screen. The second data object is the turtles list, an expandable +array of turtles which holds pointers to all turtles on the specific board.
+

+ +

The most important part in the board's work is to notify the turtles +on any event that happened on the board such as drawing, changing background +or moving of a turtle. If for example a user draws a line on the board, +the board (after drawing the line) goes through the turtles list and tell +each one that some event happened at a rectangle that contains the line. +Each turtle will decide if this has any importance to it or not.
+

+ +

Apart from that, the board handles all the user interface from the menus +and the toolbar. The most obvious example is the move turtle button, which, +when pressed, causes the board to find a turtle close enough to the click's +location. Then, on every movement of the mouse it gives the turtle a command +to move to this point.
+

+ +

In order to support scrolling of the picture, we derived the CBoardView +class from CScrollView. The interface with the interpreter threads +is done via a message queue. The main function is ReadAndEval, +which gets a message and then interprets its and act upon the result.
+

+ +

TURTLES
+

+ +

In addition to a pointer to its current board, and to inner-state variable +which affects its graphical aspects, every turtle holds an expandable array +of interrupts. When a turtle gets from the window that a message signifying +that some change has happened, it sends this change to each of its interrupts +(only if the interrupt flag is on) and the interrupt is responsible to +send an appropriate message if necessary. The turtle's location are stored +as floating points on x,y axes, to allow for accuracy on the turtle's location +and heading.
+

+ +

The turtles interacts with the interpreter thread using a message queue. +As with the board, the main function here is the ReadAndEval, +which translates these messages to valid function calls.
+

+ +

VISION
+

+ +

Every turtle holds a pointer to the bitmap it is drawing on. When it +is "looking" for a color it calculates the minimal rectangle +that holds the desired area. Then it iterates on all the pixels in this +rectangle. First it checks if the pixel is in the vision area using the +sign rule to determine if a point is clockwise or anti clockwise from a +line, and then check for distance. If the point is in the relevant area +the turtle gets its color from the bitmap and compares it with the sought +color.
+

+ +

When looking for a specific turtle, the turtle gets this turtle's position +and calculates if this location is in the relevant area using the same +algorithm. When looking for any turtle, the turtle passes the relevant +arguments to the view, which then uses the same algorithm for each turtle +on its turtles array.
+

+ +

INTERRUPTS
+

+ +

Each turtle holds an expandable array of interrupts. Each interrupts +is an object that is much like a turtle vision. The interrupts has the +view area argument and what it is looking for. It also has the message +it needs to send and a pointer to the given queue. When the turtle notifies +the interrupt that a change has happened, the interrupt first checks if +the change is an area which is of interest to it. If so it calls the turtle +look function with its location and the sought object. According to the +turtle's answer and to the data stored inside the interrupt, the interrupt +sends the needed message, if any.
+
+

+ +

CLASS ORGANIZATION
+

+ +


+
+

+ +

Message-passing mechanisms:
+

+ +

+

+ + + +

+

+
+ [TOP] + [PREV] + [PREV] + [PREV] +
+ + + + + + diff --git a/websites/www.cs.bgu.ac.il/~elad/GALAPAGOS/20010608221151/~elad/GALAPAGOS/manual.html b/websites/www.cs.bgu.ac.il/~elad/GALAPAGOS/20010608221151/~elad/GALAPAGOS/manual.html new file mode 100644 index 0000000..030d010 --- /dev/null +++ b/websites/www.cs.bgu.ac.il/~elad/GALAPAGOS/20010608221151/~elad/GALAPAGOS/manual.html @@ -0,0 +1,1404 @@ + + + + Galapagos - Programmer's Manual + + + + + +
+ [PREV] + [PREV] + [PREV] +
+
+

+ +

PROGRAMMER'S MANUAL:
+NONSTANDARD PRIMITIVES

+ + + +

+

+ +

Welcome to Galapagos Scheme. This chapter is intended +as a quick reference to Galapagos's extensions over traditional Scheme. +Knowledge of Scheme is assumed. Galapagos Scheme is compliant with both +R4RS and IEEE standard P1178. If you've read the chapter titled +"Scheme extensions", you can and should skip the short introduction +in each section. This complete chapter appears as on-line help in Galapagos, +just a F1 click away.
+

+ +

+

+ +

ENVIRONMENTS
+

+ +

An environment is a list of frames, +with the global environment in its tail. A frame is a list +of bindings, which map variables to their values. (define...) +adds a binding to the frame at the top of the current environment. +(set!...) family of commands modify +an existing binding, in the frame where it was defined. When a variable +is referenced, the current environment is searched from head to tail, and +the first binding found dictates the value of the variable.

+ +

The first interpreter, which pops up as Galapagos +is started, runs at the global environment (the way traditional Scheme +works). Additional interpreters (threads) run at distinct environments, +which contain a single initially empty frame, and a pointer to the global +environment.
+
+

+ +

(clone-environment +env [depth])
+

+ +

Clone-environment will make an exact copy of the +environment env, by copying its frames +one by one. If depth is specified then the new environment will be the +collection of frames which is up to depth +frames from the current frame. And the last frame will point to the depth ++ 1 frames from the current one in env. +
+

+ +

This means that if we are now in environment e1 +and done (define x 7). Then if we'll +write

+ +

(define e2 (clone-environment +(current-environment))),

+ +

the result of

+ +

(eval@ e2 x) +

+ +

will return 7.
+

+ +

But if we are not in a lower frame than the one +x was defined in and write

+ +

(define e2 (clone-environment +(current-environment) 1))

+ +

and write the value of x is undefined.

+ +

(Unless it was defined in the global environment) +
+

+ +

Note: Only the bindings are copied. The bound values +are not. Example:

+ +

(define x (cons 1 2)) +

+ +

(define e (clone-environment +(current-environment)))

+ +

(eval@ e (set-cdr! X 6)) +

+ +

will change the 2 into 6 at both environments. +However,

+ +

(set! x 7) +

+ +

will only affect one copy.
+

+ +

(pop-environment +env)
+

+ +

Returns the current environment without the first +frame. This means the first frame on the list of frames is "popped" +out.

+ +

If env was +made from f3->f2->f1->Global, the result will be f2->f1->Global. +

+ +

(fx means frame number x)

+ +

Example:

+ +

(define e2 (pop-environment +(current-environment)))
+

+ +

(extend-environment +env)
+

+ +

Extends env with +a new empty frame (where nothing is defined yet).

+ +

This means the if env +was f2->f1->Global the result will be f3->f2->f1->Global. +

+ +

(fx means frame number x)

+ +

Example:

+ +

(define e2 (extend-environment +(current-environment)))
+

+ +

(current-environment) +
+

+ +

Returns the current environment.
+

+ +

(environment? +env)
+

+ +

A predicate that is true if env +is an environment.

+ +

Example:

+ +

(environment? (current-environment)) +

+ +

Will return true.
+

+ +

(parent-environment) +
+

+ +

Returns the parent environment. This is the environment +where (new-thread) was called to create +this thread. The First thread returns the global environment.

+ +

Example:

+ +

(eval@ (parent-environment) +y)

+ +

Will return the value of y in the parent environment.
+

+ +

(base-environment) +
+

+ +

The environment where the interpreter runs.
+

+ +

(set-base-environment +env)
+

+ +

Sets the base environment (where the interpreter +runs) to be env

+ +

Example:

+ +

(set-base-environment +(parent-environment))

+ +

Will make this thread run in the same environment +as its father)
+

+ +

(eval@ env forms...) +
+

+ +

Evaluates forms in given environment.

+ +

Example:

+ +

(define x 7) +

+ +

(define e2 (clone-environment +(current-environment)))

+ +

(eval@ e2 x)
+

+ +

The result will be 7
+

+ +

(eval@p forms...) +
+

+ +

Evaluates forms in parent environment.

+ +

Example:

+ +

Say we want to make our turtle walk 30 degrees +more than the father's turtle. Then we can write:

+ +

(set-heading! T (+ 30 +(eval@p (turtle-heading t))))
+

+ +

MESSAGE QUEUES
+

+ +

Message queues are MT-safe mechanisms used to pass +messages, possibly between threads. Messages accepted must be cons, its +car being the message type and the cdr is the message body. Both can be +any kind of Scheme object.
+
+

+ +

(make-queue) +

+ +

Creates a new message queue.

+ +

Example:

+ +

(define q (make-queue)) +
+

+ +

(message-queue? +q)

+ +

A predicate that is true if q +is a queue.

+ +

Example:

+ +

(message-queue? q)

+ +

Will return true for q from the previous example.
+

+ +

(peek-message +q [type])
+

+ +

Return true if there is a message (of given type, +or of any type if unspecified) in the queue q. +

+ +

Example:

+ +

(peek-message q) +

+ +

Will return falsif the queue q is empty. +

+ +

Note: types are compared using (equals?) +.
+

+ +

(post-message +q typ_msg)
+

+ +

Posts the message typ_msg +to the queue q.

+ +

typ_msg must +be a cons (type . message).

+ +

Example:

+ +

(post-message q (cons +'type-welcome 'hello))
+

+ +

(get-message [time-out] +q [type])
+

+ +

Get message from queue q +, if time-out is defined +waits only time-out seconds, and

+ +

optionally gets only messages from type type. +

+ +

Example:

+ +

(define msg (get-message +7 q 'type-welcome))

+ +

The result will be (if the previous posting was +done) ('type-welcome . 'hello)

+ +

Note: types are compared using (equals?) +.
+

+ +

WINDOW COMMANDS
+
+

+ +

A window is the graphical board on which the turtles +and the user draw. It is a bitmap of size 800x600.
+
+

+ +

(new-window [name]) +
+

+ +

Makes a new window, name +is a symbol or a string which will also be the window's title. The window's +color will be white and it's size 800x600.

+ +

Example:

+ +

(define w (new-window +'my-window))

+ +

Will create a new window with the title my-window. +
+

+ +

(rename-window! +win [name])
+

+ +

Renames the window win. name +is a symbol or a string which will also be the window's title.

+ +

Example:

+ +

(rename-window! w 'foo) +

+ +

Will make the title of w to be foo.
+

+ +

(set-background-color! +R G B)
+

+ +

Set the background color of the window. All the +turtles in the window are notified on the new color (used in pen-erase) +

+ +

The colors are defined in terms of Red +Green Blue +(where 0,0,0 is black and 255,255,255 is white).

+ +

Example:

+ +

(set-background-color! +w 255 255 0)

+ +

Will turn the background color of w +to yellow
+

+ +

(clear-window +w)
+

+ +

Clears the screen from all the previous drawings, +leaving only the turtles images on it.

+ +

Example:

+ +

(clear-window w)
+

+ +

(load-bitmap w +"filename" [x y])
+

+ +

Loads the bitmap "filename" +and makes it the background of w. x y are +the coordinates of the upper left corner of the picture. If x +y are not given then the picture is centered.

+ +

Example:

+ +

(load-bitmap w "c:\\windows\\forest.bmp") +
+

+ +

This operation can also be done using the Board +menu.
+
+

+ +

(save-bitmap w +"filename")
+

+ +

Saves the window into a bitmap file called "filename". +

+ +

Example:

+ +

(save-bitmap w "my_draw.bmp") +
+

+ +

This operation can also be done using the Board +menu.
+

+ +

(window-alive? +win)
+

+ +

True if win +is alive, meaning it can get commands.
+

+ +

(window-name w) +

+ +

Returns the name of w. +

+ +

Example:

+ +

(window-name w) +

+ +

Will return "foo" on our window.
+

+ +

TURTLE COMMANDS

+ +

A turtle is an object which is connected to a certain +window. It has inner state variables:
+

+ +

- width: the width +of the pen.

+ +

- heading: the direction +the turtle will go on command forward!. +The heading is in degrees where 0 is upwards and adding to the heading +means clock wise rotation.

+ +

- visibility: if the +body of the turtle is visible on the board or not.

+ +

- solid: if the turtle +is a "solid" turtle (its interior is also drawn) or "hollow" +one (only its circumference is drawn).

+ +

- position: the location +of the turtle on the board, where 0,0 is the upper left corner. +

+ +

- color: the color +of the turtle and it's pen, given in RGB format.

+ +

- pen condition: the +turtle's pen can be in three states:

+ +
    +
  • pen-down : the turtle +will draw as it moves.
    • + +
  • pen-up : the turtle +will not draw as it moves.
    • + +
  • pen-erase : the turtle +will draw in the color of the background as it moves.
    • +
+ +

- pen width: the width +of the pen, the bigger the width the thicker the pen will be.
+

+ +

Turtles can also "see" the board or other +turtles (only from the same board) and can handle user interrupts. A turtle +is always connected to a certain view, which is the view it is drawing +on. Turtles can move between views.
+
+

+ +

(make-turtle win +[name])
+

+ +

Creates and return a new turtle, in window win, +optional name (where name can be anything). +

+ +

The inner state of the new turtle will be: +

+ +
    +
  • position - 400,300
    • + +
  • heading - 0
    • + +
  • color - 0,0,0 (black)
    • + +
  • width - 2
    • + +
  • visible - true
    • + +
  • solid - true
    • +
+ +

Example:

+ +

(define t (make-turtle +'turty))
+

+ +

(turtle-alive? +t)
+

+ +

A predicate that is true if t +is alive, meaning t can get commands. +

+ +

Example:

+ +

(turtle-alive? t)

+ +

Will return true on our t.
+

+ +

(clone-turtle +t [name])
+

+ +

Creates an identical turtle to t +(same inner state).

+ +

Example:

+ +

(define t2 (clone-turtle +t))
+

+ +

(rename-turtle +t [name])
+

+ +

Renames the turtle, name is a string or a symbol +

+ +

Example:

+ +

(rename-turtle t 'pongy) +
+

+ +

(turtle-name t) +
+

+ +

Returns the name of t. +

+ +

Example:

+ +

(turtle-name t) +

+ +

Will return "pongy" on our t.
+

+ +

(forward! t d)
+

+ +

Makes t go +forward (in the heading of t) +d steps. +t will draw while going according to +the state of it's pen.

+ +

Example:

+ +

(forward! t 100) +

+ +

Will cause t +to go forward 100 steps. (In our case since t's +heading hasn't changed it will go upwards)
+

+ +

(turtle-width! +t n)

+ +

Set the width of t's +pen to be n. The bigger n +is the wider the pen will be.
+

+ +

(backwards! t +d)
+

+ +

Same as forward, just in the opposite direction. +

+ +

Example:

+ +

(backwards! t 100) +

+ +

is the same as

+ +

(forward! t -100)
+

+ +

(right! t d)
+

+ +

Will set a new heading to t. +The new heading is the old heading plus d, meaning +t will rotate clock-wise.

+ +

Example:

+ +

(right! t 90) +

+ +

Will make t +turn 90 degrees to the
+

+ +

(left! t d) +

+ +

Same as right, other direction
+

+ +

(set-heading! +t val)
+

+ +

Sets the heading of t +to be val. 0 is upwards and 90 is to +the right.

+ +

Example:

+ +

(set-heading t 180) +

+ +

Will cause t +to point to the bottom of the screen.
+

+ +

(move-to! t x +y)
+

+ +

Makes t move +to point x,y without painting. 0,0 +is the top-left corner of the window.

+ +

Example:

+ +

(move-to! T 100 100) +

+ +

Will cause t +to move to point 100,100.
+

+ +

(draw-to! t x +y)
+

+ +

Moves t to +x,y possibly drawing or erasing according +to the state of t's pen.

+ +

Example:

+ +

(draw-to! t 0 0)
+

+ +

(move-turtle-to-window +t win)

+ +

Move t to the +window win

+ +

Example:

+ +

(move-turtle-to-window +t w)
+

+ +

(pen-up! t)
+

+ +

The pen of t +is up, so he won't paint when moving.

+ +

Example:

+ +

(pen-up! t)
+

+ +

(pen-down! t)
+

+ +

Causes t's +pen to be down, meaning he will draw as he is moving.
+

+ +

(pen-erase! t)
+

+ +

Causes t's +pen to be in the same color as the background color of the window it is +attached to.
+

+ +

(show-turtle! +t)
+

+ +

Makes t visible. +Meaning he will be seen on the board.

+ +

Example:

+ +

(show-turtle! t)
+

+ +

(hide-turtle! +t)
+

+ +

Makes t invisible. +Meaning he will not be seen on the board. (but all the drawing he does +will be seen)

+ +

Example:

+ +

(hide-turtle! t)
+

+ +

(make-turtle-solid! +t)
+

+ +

Makes t a solid +turtle.
+

+ +

(make-turtle-hollow! +t)
+

+ +

Make t a "hollow" +turtle.
+

+ +

(kill-turtle! +t)
+

+ +

Kills t. Meaning +it will be erased from the board and will not accept further commands. +

+ +

Note: This is the only way to get rid of a turtle. +

+ +

Example:

+ +

(kill-turtle! t) +

+ +

Will cause when writing t +in the command line to the response

+ +

#<dead turtle>
+

+ +

(set-color! t +R G B) or (set-color! t (list R G B)
+

+ +

Sets t's color +(and it's pen), in RGB format.

+ +

Example:

+ +

(set-color! t 255 0 255) +

+ +

Will cause t +to be pinkish.

+ +

Same as:

+ +

(define pinkish '(255 +0 255))

+ +

(set-color! t pinkish)
+

+ +

(turtle-inner-state +t)
+

+ +

Returns a list of 6 parameters: color, heading, +hidden-flag, pen width, solid flag, location (cons x y))

+ +

Example:

+ +

(define new-t (make-turtle +w))

+ +

(turtle-inner-state new-t) +

+ +

Will return the list

+ +

((0 0 0) 0.0 #f 2 #t (400.0 +. 300.0))
+

+ +

Below are functions that returns only one of the +parameters returned by turtle-inner-state: +
+

+ +

(turtle-color t) +

+ +

(turtle-heading t) +

+ +

(turtle-visible t) +

+ +

(turtle-width t) +

+ +

(turtle-solid? t) +

+ +

(turtle-position t)
+

+ +

TURTLE VISION
+

+ +

A turtle can interact with the board. It can "see" +colors or other turtles.
+
+

+ +

(look t distance +angle '(R G B))
+

+ +

Will return true if there is a point in color (R +G B) in distance distance from +t and in the area bordered by the angle +2*angle.

+ +

Example:

+ +

(look t 50 20 '(0 0 0)) +

+ +

Will cause t +to search for the color black (RGB 0,0,0) in the area shown here in blue:
+

+ +


+

+ +

(look t distance +angle [t1])
+

+ +

Same as if looking for color, just this time it +will be true is t1 is in the visible area.

+ +

If no target turtle is defined then the function +will return true if any turtle from this window is in the visible area. +

+ +

Example:

+ +

(define new-t (clone-turtle +t))

+ +

(forward! new-t 30) +

+ +

(look t 50 20 new-t) +

+ +

And

+ +

(look t 50 20) +

+ +

Will both return true.
+
+

+ +

INTERRUPTS (NOTIFICATIONS) +
+

+ +

A turtle can hold a list of interrupts (or notifications). +When an interrupt is invoked it send a given message to the thread that +sent the command. Every interrupt is defined by a "look" arguments. +An interruptcan be of three kinds:
+

+ +

A "yes" interrupt - The interrupt will +happen (message sent) on every "first" time the look returns +yes.

+ +

Meaning if a turtle is told to invoke an interrupt +every time it sees blue on a certain region. Then the first time it sees +blue it will invoke the interrupt. From now on if the blue is in view it +will not invoke the interrupt. Then if it loses sight of the blue object, +the next time it sees blue again it will invoke the interrupt, and so on.
+

+ +

A "no" interrupt - Same as the "yes" +interrupt, just this time the interrupt is invoked when the sought object +is not seen.
+

+ +

A "both" interrupt - First time the sought +object is viewed the "yes" message is sent, then the first time +the turtle loses sight of the object the "no" message is sent +and so on.

+ +

A message can be any SCHEME object.
+

+ +

When the interpreter is installing interrupt to +a turtle it need to install a handler, which is a function that +takes only one argument and this argument is the messages that comes from +the interrupt.

+ +

If no handler is installed, the messages will be +sent but will have no affect on the thread of execution.

+ +

There can be only one handler per thread and a +handler can not be a primitive procedure.
+

+ +

(turtle-notify +t msg1 msg2 distance angle TARGET)

+ +

Instructs a turtle to send msg1 and msg2 upon seeing +and not seeing, respectively, the target. The messages can be any Scheme +objects, which are sent to the thread as if by (tell-thread). The other +parameters - see (look)

+ +

Example:

+ +

(turtle-notify t 'yes +'no 50 10 new-t)

+ +

This is a "both" kind interrupt.
+

+ +

(turtle-no-notify +t distance angle TARGET)
+

+ +

Tells the turtle to stop notifying in the given +case. Very like deleting the interrupt from the turtle.
+

+ +

(notify-when[-not] +t1 msg dist ang TARGET)
+

+ +

Instructs a turtle to send msg upon [stopping] +seeing the target. This is a "yes" or "no" interrupt. +

+ +

Example:

+ +

(notify-when t 'gotcha +50 10 new-t)

+ +

Will cause t +to send the message "gotcha" every "first" time it +sees new-t.
+

+ +

(stop-notifying +t)
+

+ +

t will temporarily +stop notifying on interrupts. Like "clear interrupts".
+

+ +

(continue-notifying +t)
+

+ +

t will resume +notifying on interrupts.
+

+ +

(no-notifications +t)

+ +

Deletes all t's +interrupts.
+

+ +

(notify-on-click +turtle msg)
+

+ +

Instructs turtle to send msg when right-clicked +with the mouse (distance of 5 pixels from the turtle location). There can +be only one interrupt of this kind per turtle.

+ +

Example:

+ +

(notify-on-click t 'ouch) +

+ +

Will case t +to send the message "ouch" when the user right-clicks next to +it.
+

+ +

(notify-on-click +window msg)
+

+ +

Instructs window to +send msg when right-clicked with the +mouse not close to any turtle.
+

+ +

(clear-notify-click +t)
+

+ +

Clears the user right click interrupt
+

+ +

(install-handler +func)
+

+ +

Installs a message handler. When a message arrives, +func is called with it as a sole argument. +

+ +

There can be only one handler per thread. func +can not be a primitive procedure.

+ +

Example:

+ +

(define (print x) (write +x))

+ +

(notify-on-click t 'click-on-t) +

+ +

(install-handler print) +

+ +

Will cause that the message "click-on-t" +will be printed each time the user right clicked on t. +
+

+ +

THREADS
+

+ +

Galapagos supports multiple threads. Every thread +is a complete Scheme interpreter, with its own base environment. Every +thread has a Thread Object, which uniquely identifies it.
+

+ +

A console is a text window where the user +can type commands (when the interpreter is idle) and see output. A thread +may or may not be bound to a console. Information printed by a non-bound +thread is lost; a non-bound thread waiting for input is stuck (unless provisions +were made to allow a new console to be created by means of inter-thread +communications.) If a non-bound thread has nothing to do, instead of waiting +for input like a bound thread, it will terminate.
+

+ +

(this-thread)
+

+ +

Returns the thread-object of the current thread. +

+ +

Example:

+ +

(this-thread) +

+ +

Will return something like

+ +

#<thread 0x6d1e2c> +
+

+ +

(is-first-thread?) +
+

+ +

True if the current thread is the first SCM thread.
+

+ +

(thread? t) +

+ +

True if t is a thread

+ +

Example:

+ +

(thread? (this-thread)) +

+ +

Will return true
+

+ +

(active-threads) +
+

+ +

Returns the number of active threads
+

+ +

(new-thread form+) +

+ +

Creates a new thread that will calculate the form[s] +

+ +

Example:

+ +

(new-thread (define t +(make-turtle w)) (forward! t 200))

+ +

Will make a new thread that will create a new turtle +and will move it forward 200 steps and then terminates.

+ +

(new-thread (bind-to-console)) +

+ +

Will make a new thread that's ready to accept commands +form a newly-created window. The same can be achieved by selecting "Fork" +from "Scheme" menu.
+
+
+

+ +

(break& form+) +
+

+ +

Causes the current thread to stop and calculate +the form[s]. The current computation is lost.
+

+ +

(bind-to-console) +
+

+ +

The thread will get its commands from a console. +

+ +

Example:

+ +

(new-thread (bind-to-console)) +

+ +

Will create a new thread that gets it.
+

+ +

(unbind-console) +

+ +

Close bound console.
+

+ +

(rename-console +name)

+ +

New name for the current console
+

+ +

(install-handler +func)
+

+ +

Installs a message handler. When a message arrives, +func is called with it as a sole argument. +

+ +

There can be only one handler per thread. func +can not be a primitive procedure.

+ +

Example:

+ +

(define (print x) (write +x))

+ +

(notify-on-click t 'click-on-t) +

+ +

(install-handler print) +

+ +

Will cause that the message "click-on-t" +will be printed each time the user right clicked on t. +

+ +

Note: (new -thread (install-handler +f)) is a bad idea, because the fresh thread will terminate immediately. +
+

+ +

(tell-thread th +x)
+

+ +

Sends message X +to thread th. Returns true on success. +

+ +

If th has no +handler installed it will cause nothing.
+

+ +

(quit-thread)
+

+ +

Kills the current thread, does not work on the +main thread.
+

+ +

(quit-program)
+

+ +

Quits the program.
+
+
+

+ +

These are primitives taken from SCM, which were +modifies to be multithread-safe: + +

+ + +

+An arbiter +is a data object the canbe used as a +guard for critical sections. It can be either "locked" or "unlocked". It +is ideal when a busy/wait mechanism is required, since it is MT-safe. +

+ + +

(sleep n) +

+ +

Causes the current thread to block for (approximately) +n seconds. (sleep 0) is a way to instruct +a thread to give up its remaining processor time.
+

+ + +

(make-arbiter +name)
+

+ +

Makes an arbiter called name. +

+ +

Example:

+ +

(define x-arb (make-arbiter +'x-guard))
+
+

+ +

(try-arbiter arb) +
+

+ +

Checks if the arbiter arb +is up. If the arbiter is up returns false, otherwise it sets +the arbiter to be "up" and returns true.

+ +

Example:

+ +

(try-arbiter x-arb) +

+ +

Will return true and set x-arb +to be "up". But trying it for the second time return false since +x-arb is "up".
+

+ +

(release-arbiter +arb)
+

+ +

Set the arb +to be "down". If the arbiter was "up" returns true +otherwise returns false.

+ +

Example:

+ +

(release-arbiter x-arb) +

+ +

Will return true , but using this function again +will return false since x-arb is already +down.

+ + +

+

+
+ [TOP] + [PREV] + [PREV] + [PREV] +
+ + + + + diff --git a/websites/www.cs.bgu.ac.il/~elad/GALAPAGOS/20010921035619/~elad/GALAPAGOS/index.html b/websites/www.cs.bgu.ac.il/~elad/GALAPAGOS/20010921035619/~elad/GALAPAGOS/index.html new file mode 100644 index 0000000..56faa74 --- /dev/null +++ b/websites/www.cs.bgu.ac.il/~elad/GALAPAGOS/20010921035619/~elad/GALAPAGOS/index.html @@ -0,0 +1,95 @@ + + + + Galapagos + + + +

Welcome to
+GALAPAGOS

+ +Galapagos is an interactive multithreaded Scheme interpreter with turtle +graphics for Windows 95. It is built around the SCM interpreter, and it +provides multiple interpreters, threads, turtles, and drawing boards, all +running concurrently using WIN32's multithreading abilities, and freely +available. + +

+

+

+

+

+Spring 1997

+Graduation project

+Department of Math & Computer Science,

+Ben-Gurion University of the Negev

+
+Written by Elad Eyal and Miki +Tebeka.
+
+Supervisor: Dr. Michael Elhadad +
+

+

+

+

+ +

TABLE OF CONTENTS

+ + + +

+ +
+ +

DOWNLOAD CENTER

+

+

GNU LICENSE. COPYRIGHTED. PROVIDED "AS IS". NO +WARRANTIES OR LIABILITIES. ETC.
+

+

+500K gps10bin.zip - Executable and required Scheme libraries (SLIB)
+700K gps10src.zip - Same with all source code
+400K mfc40dll.zip - You might need this MFC40.DLL if you +don't have it already.
+ + diff --git a/websites/www.cs.bgu.ac.il/~elad/GALAPAGOS/20220312053305/~elad/GALAPAGOS/index.html b/websites/www.cs.bgu.ac.il/~elad/GALAPAGOS/20220312053305/~elad/GALAPAGOS/index.html new file mode 100644 index 0000000..56faa74 --- /dev/null +++ b/websites/www.cs.bgu.ac.il/~elad/GALAPAGOS/20220312053305/~elad/GALAPAGOS/index.html @@ -0,0 +1,95 @@ + + + + Galapagos + + + +

Welcome to
+GALAPAGOS

+ +Galapagos is an interactive multithreaded Scheme interpreter with turtle +graphics for Windows 95. It is built around the SCM interpreter, and it +provides multiple interpreters, threads, turtles, and drawing boards, all +running concurrently using WIN32's multithreading abilities, and freely +available. + +

+

+

+

+

+Spring 1997

+Graduation project

+Department of Math & Computer Science,

+Ben-Gurion University of the Negev

+
+Written by Elad Eyal and Miki +Tebeka.
+
+Supervisor: Dr. Michael Elhadad +
+

+

+

+

+ +

TABLE OF CONTENTS

+ + + +

+ +
+ +

DOWNLOAD CENTER

+

+

GNU LICENSE. COPYRIGHTED. PROVIDED "AS IS". NO +WARRANTIES OR LIABILITIES. ETC.
+

+

+500K gps10bin.zip - Executable and required Scheme libraries (SLIB)
+700K gps10src.zip - Same with all source code
+400K mfc40dll.zip - You might need this MFC40.DLL if you +don't have it already.
+ + diff --git a/websites/www.cs.bgu.ac.il/~elad/GALAPAGOS/20220312053307/~elad/GALAPAGOS/index.html b/websites/www.cs.bgu.ac.il/~elad/GALAPAGOS/20220312053307/~elad/GALAPAGOS/index.html new file mode 100644 index 0000000..56faa74 --- /dev/null +++ b/websites/www.cs.bgu.ac.il/~elad/GALAPAGOS/20220312053307/~elad/GALAPAGOS/index.html @@ -0,0 +1,95 @@ + + + + Galapagos + + + +

Welcome to
+GALAPAGOS

+ +Galapagos is an interactive multithreaded Scheme interpreter with turtle +graphics for Windows 95. It is built around the SCM interpreter, and it +provides multiple interpreters, threads, turtles, and drawing boards, all +running concurrently using WIN32's multithreading abilities, and freely +available. + +

+

+

+

+

+Spring 1997

+Graduation project

+Department of Math & Computer Science,

+Ben-Gurion University of the Negev

+
+Written by Elad Eyal and Miki +Tebeka.
+
+Supervisor: Dr. Michael Elhadad +
+

+

+

+

+ +

TABLE OF CONTENTS

+ + + +

+ +
+ +

DOWNLOAD CENTER

+

+

GNU LICENSE. COPYRIGHTED. PROVIDED "AS IS". NO +WARRANTIES OR LIABILITIES. ETC.
+

+

+500K gps10bin.zip - Executable and required Scheme libraries (SLIB)
+700K gps10src.zip - Same with all source code
+400K mfc40dll.zip - You might need this MFC40.DLL if you +don't have it already.
+ +