274 lines
6.6 KiB
C
274 lines
6.6 KiB
C
|
/*
|
|||
|
* tclWinNotify.c --
|
|||
|
*
|
|||
|
* This file contains Windows-specific procedures for the notifier,
|
|||
|
* which is the lowest-level part of the Tcl event loop. This file
|
|||
|
* works together with ../generic/tclNotify.c.
|
|||
|
*
|
|||
|
* Copyright (c) 1995-1996 Sun Microsystems, Inc.
|
|||
|
*
|
|||
|
* See the file "license.terms" for information on usage and redistribution
|
|||
|
* of this file, and for a DISCLAIMER OF ALL WARRANTIES.
|
|||
|
*
|
|||
|
* SCCS: @(#) tclWinNotify.c 1.8 96/02/29 09:19:08
|
|||
|
*/
|
|||
|
|
|||
|
#include "tclInt.h"
|
|||
|
#include "tclPort.h"
|
|||
|
#ifndef STk_CODE
|
|||
|
# include <winsock.h>
|
|||
|
#endif
|
|||
|
|
|||
|
/*
|
|||
|
* The following variable is a backdoor for use by Tk. It is set when
|
|||
|
* Tk needs to process events on the Tcl event queue without reentering
|
|||
|
* the system event loop. Tk uses it to flush the Tcl event queue.
|
|||
|
*/
|
|||
|
|
|||
|
static int ignoreEvents = 0;
|
|||
|
|
|||
|
/*
|
|||
|
*----------------------------------------------------------------------
|
|||
|
*
|
|||
|
* TclWinFlushEvents --
|
|||
|
*
|
|||
|
* This function is a special purpose hack to allow Tk to
|
|||
|
* process queued Window events during a recursive event loop
|
|||
|
* without looking for new events on the system event queue.
|
|||
|
*
|
|||
|
* Results:
|
|||
|
* None.
|
|||
|
*
|
|||
|
* Side effects:
|
|||
|
* Services any pending Tcl events and calls idle handlers.
|
|||
|
*
|
|||
|
*----------------------------------------------------------------------
|
|||
|
*/
|
|||
|
|
|||
|
void
|
|||
|
TclWinFlushEvents()
|
|||
|
{
|
|||
|
ignoreEvents = 1;
|
|||
|
while (Tcl_DoOneEvent(TCL_DONT_WAIT|TCL_WINDOW_EVENTS|TCL_IDLE_EVENTS)) {
|
|||
|
}
|
|||
|
ignoreEvents = 0;
|
|||
|
}
|
|||
|
|
|||
|
/*
|
|||
|
*----------------------------------------------------------------------
|
|||
|
*
|
|||
|
* Tcl_WatchFile --
|
|||
|
*
|
|||
|
* Arrange for Tcl_DoOneEvent to include this file in the masks
|
|||
|
* for the next call to select. This procedure is invoked by
|
|||
|
* event sources, which are in turn invoked by Tcl_DoOneEvent
|
|||
|
* before it invokes select.
|
|||
|
*
|
|||
|
* Results:
|
|||
|
* None.
|
|||
|
*
|
|||
|
* Side effects:
|
|||
|
*
|
|||
|
* The notifier will generate a file event when the I/O channel
|
|||
|
* given by fd next becomes ready in the way indicated by mask.
|
|||
|
* If fd is already registered then the old mask will be replaced
|
|||
|
* with the new one. Once the event is sent, the notifier will
|
|||
|
* not send any more events about the fd until the next call to
|
|||
|
* Tcl_NotifyFile.
|
|||
|
*
|
|||
|
*----------------------------------------------------------------------
|
|||
|
*/
|
|||
|
|
|||
|
void
|
|||
|
Tcl_WatchFile(file, mask)
|
|||
|
Tcl_File file; /* Opaque identifier for a stream. */
|
|||
|
int mask; /* OR'ed combination of TCL_READABLE,
|
|||
|
* TCL_WRITABLE, and TCL_EXCEPTION:
|
|||
|
* indicates conditions to wait for
|
|||
|
* in select. */
|
|||
|
{
|
|||
|
int type;
|
|||
|
|
|||
|
(void) Tcl_GetFileInfo(file, &type);
|
|||
|
|
|||
|
if (type == TCL_WIN_SOCKET) {
|
|||
|
#ifndef STk_CODE
|
|||
|
TclWinWatchSocket(file, mask);
|
|||
|
#endif
|
|||
|
} else if (type == TCL_WIN_FILE) {
|
|||
|
Tcl_Time timeout = { 0, 0 };
|
|||
|
|
|||
|
/*
|
|||
|
* Files are always ready under Windows, so we just set a
|
|||
|
* 0 timeout.
|
|||
|
*/
|
|||
|
|
|||
|
Tcl_SetMaxBlockTime(&timeout);
|
|||
|
} else if (type == TCL_WIN_PIPE) {
|
|||
|
/*
|
|||
|
* We don't support waiting on pipes yet.
|
|||
|
*/
|
|||
|
}
|
|||
|
}
|
|||
|
|
|||
|
/*
|
|||
|
*----------------------------------------------------------------------
|
|||
|
*
|
|||
|
* Tcl_FileReady --
|
|||
|
*
|
|||
|
* Indicates what conditions (readable, writable, etc.) were
|
|||
|
* present on a file the last time the notifier invoked select.
|
|||
|
* This procedure is typically invoked by event sources to see
|
|||
|
* if they should queue events.
|
|||
|
*
|
|||
|
* Results:
|
|||
|
* The return value is 0 if none of the conditions specified by mask
|
|||
|
* was true for fd the last time the system checked. If any of the
|
|||
|
* conditions were true, then the return value is a mask of those
|
|||
|
* that were true.
|
|||
|
*
|
|||
|
* Side effects:
|
|||
|
* None.
|
|||
|
*
|
|||
|
*----------------------------------------------------------------------
|
|||
|
*/
|
|||
|
|
|||
|
int
|
|||
|
Tcl_FileReady(file, mask)
|
|||
|
Tcl_File file; /* File handle for a stream. */
|
|||
|
int mask; /* OR'ed combination of TCL_READABLE,
|
|||
|
* TCL_WRITABLE, and TCL_EXCEPTION:
|
|||
|
* indicates conditions caller cares about. */
|
|||
|
{
|
|||
|
int type;
|
|||
|
|
|||
|
(void) Tcl_GetFileInfo(file, &type);
|
|||
|
|
|||
|
if (type == TCL_WIN_SOCKET) {
|
|||
|
#ifndef STk_CODE
|
|||
|
return TclWinSocketReady(file, mask);
|
|||
|
#endif
|
|||
|
} else if (type == TCL_WIN_FILE) {
|
|||
|
/*
|
|||
|
* Under Windows, files are always ready, so we just return the
|
|||
|
* mask that was passed in.
|
|||
|
*/
|
|||
|
|
|||
|
return mask;
|
|||
|
}
|
|||
|
return 0;
|
|||
|
}
|
|||
|
|
|||
|
/*
|
|||
|
*----------------------------------------------------------------------
|
|||
|
*
|
|||
|
* Tcl_WaitForEvent --
|
|||
|
*
|
|||
|
* This procedure does the lowest level wait for events in a
|
|||
|
* platform-specific manner. It uses information provided by
|
|||
|
* previous calls to Tcl_WatchFile, plus the timePtr argument,
|
|||
|
* to determine what to wait for and how long to wait.
|
|||
|
*
|
|||
|
* Results:
|
|||
|
* The return value is normally TCL_OK. However, if there are
|
|||
|
* no events to wait for (e.g. no files and no timers) so that
|
|||
|
* the procedure would block forever, then it returns TCL_ERROR.
|
|||
|
*
|
|||
|
* Side effects:
|
|||
|
* May put the process to sleep for a while, depending on timePtr.
|
|||
|
* When this procedure returns, an event of interest to the application
|
|||
|
* has probably, but not necessarily, occurred.
|
|||
|
*
|
|||
|
*----------------------------------------------------------------------
|
|||
|
*/
|
|||
|
|
|||
|
int
|
|||
|
Tcl_WaitForEvent(timePtr)
|
|||
|
Tcl_Time *timePtr; /* Specifies the maximum amount of time
|
|||
|
* that this procedure should block before
|
|||
|
* returning. The time is given as an
|
|||
|
* interval, not an absolute wakeup time.
|
|||
|
* NULL means block forever. */
|
|||
|
{
|
|||
|
MSG msg;
|
|||
|
int foundEvent = 1;
|
|||
|
|
|||
|
/*
|
|||
|
* If we are ignoring events from the system, just return immediately.
|
|||
|
*/
|
|||
|
|
|||
|
if (ignoreEvents) {
|
|||
|
return TCL_OK;
|
|||
|
}
|
|||
|
|
|||
|
/*
|
|||
|
* Set up the asynchronous select handlers for any sockets we
|
|||
|
* are watching.
|
|||
|
*/
|
|||
|
#ifndef STk_CODE
|
|||
|
TclWinNotifySocket();
|
|||
|
#endif
|
|||
|
|
|||
|
/*
|
|||
|
* Look for an event, setting a timer so we don't block forever.
|
|||
|
*/
|
|||
|
|
|||
|
if (timePtr != NULL) {
|
|||
|
UINT ms;
|
|||
|
ms = timePtr->sec * 1000;
|
|||
|
ms += timePtr->usec / 1000;
|
|||
|
|
|||
|
if (ms > 0) {
|
|||
|
UINT timerHandle = SetTimer(NULL, 0, ms, NULL);
|
|||
|
GetMessage(&msg, NULL, 0, 0);
|
|||
|
KillTimer(NULL, timerHandle);
|
|||
|
} else {
|
|||
|
|
|||
|
/*
|
|||
|
* If the timeout is too small, we just poll.
|
|||
|
*/
|
|||
|
|
|||
|
foundEvent = PeekMessage(&msg, NULL, 0, 0, PM_REMOVE);
|
|||
|
}
|
|||
|
} else {
|
|||
|
GetMessage(&msg, NULL, 0, 0);
|
|||
|
}
|
|||
|
|
|||
|
/*
|
|||
|
* Dispatch the message, if we found one. If we are exiting, be
|
|||
|
* sure to inform Tcl so we can clean up properly.
|
|||
|
*/
|
|||
|
|
|||
|
if (foundEvent) {
|
|||
|
if (msg.message == WM_QUIT) {
|
|||
|
Tcl_Exit(0);
|
|||
|
}
|
|||
|
TranslateMessage(&msg);
|
|||
|
DispatchMessage(&msg);
|
|||
|
}
|
|||
|
return TCL_OK;
|
|||
|
}
|
|||
|
|
|||
|
/*
|
|||
|
*----------------------------------------------------------------------
|
|||
|
*
|
|||
|
* Tcl_Sleep --
|
|||
|
*
|
|||
|
* Delay execution for the specified number of milliseconds.
|
|||
|
*
|
|||
|
* Results:
|
|||
|
* None.
|
|||
|
*
|
|||
|
* Side effects:
|
|||
|
* Time passes.
|
|||
|
*
|
|||
|
*----------------------------------------------------------------------
|
|||
|
*/
|
|||
|
|
|||
|
void
|
|||
|
Tcl_Sleep(ms)
|
|||
|
int ms; /* Number of milliseconds to sleep. */
|
|||
|
{
|
|||
|
Sleep(ms);
|
|||
|
}
|