1998-04-10 06:59:06 -04:00
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/*
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* tclTimer.c --
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*
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* This file provides timer event management facilities for Tcl,
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* including the "after" command.
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*
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* Copyright (c) 1997 by Sun Microsystems, Inc.
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*
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* See the file "license.terms" for information on usage and redistribution
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* of this file, and for a DISCLAIMER OF ALL WARRANTIES.
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*
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* SCCS: @(#) tclTimer.c 1.6 97/05/20 11:08:02
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*/
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#include "tclInt.h"
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#include "tclPort.h"
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1998-09-30 07:11:02 -04:00
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#ifdef STk_CODE
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# include "tk-glue.h"
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#endif
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1998-04-10 06:59:06 -04:00
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/*
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* This flag indicates whether this module has been initialized.
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*/
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static int initialized = 0;
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/*
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* For each timer callback that's pending there is one record of the following
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* type. The normal handlers (created by Tcl_CreateTimerHandler) are chained
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* together in a list sorted by time (earliest event first).
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*/
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typedef struct TimerHandler {
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Tcl_Time time; /* When timer is to fire. */
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Tcl_TimerProc *proc; /* Procedure to call. */
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ClientData clientData; /* Argument to pass to proc. */
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Tcl_TimerToken token; /* Identifies handler so it can be
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* deleted. */
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struct TimerHandler *nextPtr; /* Next event in queue, or NULL for
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* end of queue. */
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} TimerHandler;
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static TimerHandler *firstTimerHandlerPtr = NULL;
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/* First event in queue. */
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static int lastTimerId; /* Timer identifier of most recently
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* created timer. */
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static int timerPending; /* 1 if a timer event is in the queue. */
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/*
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* The data structure below is used by the "after" command to remember
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* the command to be executed later. All of the pending "after" commands
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* for an interpreter are linked together in a list.
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*/
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typedef struct AfterInfo {
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struct AfterAssocData *assocPtr;
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/* Pointer to the "tclAfter" assocData for
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* the interp in which command will be
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* executed. */
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char *command; /* Command to execute. Malloc'ed, so must
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* be freed when structure is deallocated. */
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int id; /* Integer identifier for command; used to
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* cancel it. */
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Tcl_TimerToken token; /* Used to cancel the "after" command. NULL
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* means that the command is run as an
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* idle handler rather than as a timer
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* handler. NULL means this is an "after
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* idle" handler rather than a
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* timer handler. */
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struct AfterInfo *nextPtr; /* Next in list of all "after" commands for
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* this interpreter. */
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} AfterInfo;
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/*
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* One of the following structures is associated with each interpreter
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* for which an "after" command has ever been invoked. A pointer to
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* this structure is stored in the AssocData for the "tclAfter" key.
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*/
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typedef struct AfterAssocData {
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Tcl_Interp *interp; /* The interpreter for which this data is
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* registered. */
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AfterInfo *firstAfterPtr; /* First in list of all "after" commands
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* still pending for this interpreter, or
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* NULL if none. */
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} AfterAssocData;
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1999-09-05 07:16:41 -04:00
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#ifdef SCM_CODE
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1998-04-10 06:59:06 -04:00
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static AfterAssocData After_list;
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#endif
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/*
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* There is one of the following structures for each of the
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* handlers declared in a call to Tcl_DoWhenIdle. All of the
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* currently-active handlers are linked together into a list.
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*/
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typedef struct IdleHandler {
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Tcl_IdleProc (*proc); /* Procedure to call. */
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ClientData clientData; /* Value to pass to proc. */
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int generation; /* Used to distinguish older handlers from
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* recently-created ones. */
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struct IdleHandler *nextPtr;/* Next in list of active handlers. */
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} IdleHandler;
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static IdleHandler *idleList;
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/* First in list of all idle handlers. */
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static IdleHandler *lastIdlePtr;
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/* Last in list (or NULL for empty list). */
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static int idleGeneration; /* Used to fill in the "generation" fields
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* of IdleHandler structures. Increments
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* each time Tcl_DoOneEvent starts calling
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* idle handlers, so that all old handlers
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* can be called without calling any of the
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* new ones created by old ones. */
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/*
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* Prototypes for procedures referenced only in this file:
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*/
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1999-09-05 07:16:41 -04:00
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#ifndef SCM_CODE
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1998-04-10 06:59:06 -04:00
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static void AfterCleanupProc _ANSI_ARGS_((ClientData clientData,
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Tcl_Interp *interp));
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1998-09-30 07:11:02 -04:00
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#endif
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1998-04-10 06:59:06 -04:00
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static void AfterProc _ANSI_ARGS_((ClientData clientData));
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static void FreeAfterPtr _ANSI_ARGS_((AfterInfo *afterPtr));
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static AfterInfo * GetAfterEvent _ANSI_ARGS_((AfterAssocData *assocPtr,
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char *string));
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static void InitTimer _ANSI_ARGS_((void));
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static void TimerExitProc _ANSI_ARGS_((ClientData clientData));
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static int TimerHandlerEventProc _ANSI_ARGS_((Tcl_Event *evPtr,
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int flags));
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static void TimerCheckProc _ANSI_ARGS_((ClientData clientData,
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int flags));
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static void TimerSetupProc _ANSI_ARGS_((ClientData clientData,
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int flags));
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/*
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*----------------------------------------------------------------------
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*
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* InitTimer --
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*
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* This function initializes the timer module.
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*
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* Results:
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* None.
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*
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* Side effects:
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* Registers the idle and timer event sources.
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*
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*----------------------------------------------------------------------
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*/
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static void
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InitTimer()
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{
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initialized = 1;
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lastTimerId = 0;
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timerPending = 0;
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idleGeneration = 0;
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firstTimerHandlerPtr = NULL;
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lastIdlePtr = NULL;
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idleList = NULL;
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Tcl_CreateEventSource(TimerSetupProc, TimerCheckProc, NULL);
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Tcl_CreateExitHandler(TimerExitProc, NULL);
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}
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/*
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*----------------------------------------------------------------------
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*
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* TimerExitProc --
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*
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* This function is call at exit or unload time to remove the
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* timer and idle event sources.
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*
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* Results:
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* None.
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*
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* Side effects:
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* Removes the timer and idle event sources.
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*
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*----------------------------------------------------------------------
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*/
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static void
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TimerExitProc(clientData)
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ClientData clientData; /* Not used. */
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{
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Tcl_DeleteEventSource(TimerSetupProc, TimerCheckProc, NULL);
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initialized = 0;
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}
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/*
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*--------------------------------------------------------------
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*
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* Tcl_CreateTimerHandler --
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*
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* Arrange for a given procedure to be invoked at a particular
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* time in the future.
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*
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* Results:
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* The return value is a token for the timer event, which
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* may be used to delete the event before it fires.
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*
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* Side effects:
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* When milliseconds have elapsed, proc will be invoked
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* exactly once.
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*
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*--------------------------------------------------------------
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*/
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Tcl_TimerToken
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Tcl_CreateTimerHandler(milliseconds, proc, clientData)
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int milliseconds; /* How many milliseconds to wait
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* before invoking proc. */
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Tcl_TimerProc *proc; /* Procedure to invoke. */
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ClientData clientData; /* Arbitrary data to pass to proc. */
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{
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register TimerHandler *timerHandlerPtr, *tPtr2, *prevPtr;
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Tcl_Time time;
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if (!initialized) {
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InitTimer();
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}
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timerHandlerPtr = (TimerHandler *) ckalloc(sizeof(TimerHandler));
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/*
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* Compute when the event should fire.
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*/
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TclpGetTime(&time);
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timerHandlerPtr->time.sec = time.sec + milliseconds/1000;
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timerHandlerPtr->time.usec = time.usec + (milliseconds%1000)*1000;
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if (timerHandlerPtr->time.usec >= 1000000) {
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timerHandlerPtr->time.usec -= 1000000;
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timerHandlerPtr->time.sec += 1;
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}
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/*
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* Fill in other fields for the event.
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*/
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timerHandlerPtr->proc = proc;
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timerHandlerPtr->clientData = clientData;
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lastTimerId++;
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timerHandlerPtr->token = (Tcl_TimerToken) lastTimerId;
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/*
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* Add the event to the queue in the correct position
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* (ordered by event firing time).
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*/
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for (tPtr2 = firstTimerHandlerPtr, prevPtr = NULL; tPtr2 != NULL;
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prevPtr = tPtr2, tPtr2 = tPtr2->nextPtr) {
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if ((tPtr2->time.sec > timerHandlerPtr->time.sec)
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|| ((tPtr2->time.sec == timerHandlerPtr->time.sec)
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&& (tPtr2->time.usec > timerHandlerPtr->time.usec))) {
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break;
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}
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}
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timerHandlerPtr->nextPtr = tPtr2;
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if (prevPtr == NULL) {
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firstTimerHandlerPtr = timerHandlerPtr;
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} else {
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prevPtr->nextPtr = timerHandlerPtr;
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}
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TimerSetupProc(NULL, TCL_ALL_EVENTS);
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return timerHandlerPtr->token;
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}
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/*
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*--------------------------------------------------------------
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*
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* Tcl_DeleteTimerHandler --
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*
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* Delete a previously-registered timer handler.
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*
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* Results:
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* None.
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*
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* Side effects:
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* Destroy the timer callback identified by TimerToken,
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* so that its associated procedure will not be called.
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* If the callback has already fired, or if the given
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* token doesn't exist, then nothing happens.
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*
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*--------------------------------------------------------------
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*/
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void
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Tcl_DeleteTimerHandler(token)
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Tcl_TimerToken token; /* Result previously returned by
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* Tcl_DeleteTimerHandler. */
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{
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register TimerHandler *timerHandlerPtr, *prevPtr;
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for (timerHandlerPtr = firstTimerHandlerPtr, prevPtr = NULL;
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timerHandlerPtr != NULL; prevPtr = timerHandlerPtr,
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timerHandlerPtr = timerHandlerPtr->nextPtr) {
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if (timerHandlerPtr->token != token) {
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continue;
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}
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if (prevPtr == NULL) {
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firstTimerHandlerPtr = timerHandlerPtr->nextPtr;
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} else {
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prevPtr->nextPtr = timerHandlerPtr->nextPtr;
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}
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ckfree((char *) timerHandlerPtr);
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return;
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}
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}
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/*
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*----------------------------------------------------------------------
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*
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* TimerSetupProc --
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*
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* This function is called by Tcl_DoOneEvent to setup the timer
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* event source for before blocking. This routine checks both the
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* idle and after timer lists.
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*
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* Results:
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* None.
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*
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* Side effects:
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* May update the maximum notifier block time.
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*
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*----------------------------------------------------------------------
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*/
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static void
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TimerSetupProc(data, flags)
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ClientData data; /* Not used. */
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int flags; /* Event flags as passed to Tcl_DoOneEvent. */
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{
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Tcl_Time blockTime;
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if (((flags & TCL_IDLE_EVENTS) && idleList)
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|| ((flags & TCL_TIMER_EVENTS) && timerPending)) {
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/*
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* There is an idle handler or a pending timer event, so just poll.
|
|
|
|
|
*/
|
|
|
|
|
|
|
|
|
|
blockTime.sec = 0;
|
|
|
|
|
blockTime.usec = 0;
|
|
|
|
|
|
|
|
|
|
} else if ((flags & TCL_TIMER_EVENTS) && firstTimerHandlerPtr) {
|
|
|
|
|
/*
|
|
|
|
|
* Compute the timeout for the next timer on the list.
|
|
|
|
|
*/
|
|
|
|
|
|
|
|
|
|
TclpGetTime(&blockTime);
|
|
|
|
|
blockTime.sec = firstTimerHandlerPtr->time.sec - blockTime.sec;
|
|
|
|
|
blockTime.usec = firstTimerHandlerPtr->time.usec - blockTime.usec;
|
|
|
|
|
if (blockTime.usec < 0) {
|
|
|
|
|
blockTime.sec -= 1;
|
|
|
|
|
blockTime.usec += 1000000;
|
|
|
|
|
}
|
|
|
|
|
if (blockTime.sec < 0) {
|
|
|
|
|
blockTime.sec = 0;
|
|
|
|
|
blockTime.usec = 0;
|
|
|
|
|
}
|
|
|
|
|
} else {
|
|
|
|
|
return;
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
Tcl_SetMaxBlockTime(&blockTime);
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
/*
|
|
|
|
|
*----------------------------------------------------------------------
|
|
|
|
|
*
|
|
|
|
|
* TimerCheckProc --
|
|
|
|
|
*
|
|
|
|
|
* This function is called by Tcl_DoOneEvent to check the timer
|
|
|
|
|
* event source for events. This routine checks both the
|
|
|
|
|
* idle and after timer lists.
|
|
|
|
|
*
|
|
|
|
|
* Results:
|
|
|
|
|
* None.
|
|
|
|
|
*
|
|
|
|
|
* Side effects:
|
|
|
|
|
* May queue an event and update the maximum notifier block time.
|
|
|
|
|
*
|
|
|
|
|
*----------------------------------------------------------------------
|
|
|
|
|
*/
|
|
|
|
|
|
|
|
|
|
static void
|
|
|
|
|
TimerCheckProc(data, flags)
|
|
|
|
|
ClientData data; /* Not used. */
|
|
|
|
|
int flags; /* Event flags as passed to Tcl_DoOneEvent. */
|
|
|
|
|
{
|
|
|
|
|
Tcl_Event *timerEvPtr;
|
|
|
|
|
Tcl_Time blockTime;
|
|
|
|
|
|
|
|
|
|
if ((flags & TCL_TIMER_EVENTS) && firstTimerHandlerPtr) {
|
|
|
|
|
/*
|
|
|
|
|
* Compute the timeout for the next timer on the list.
|
|
|
|
|
*/
|
|
|
|
|
|
|
|
|
|
TclpGetTime(&blockTime);
|
|
|
|
|
blockTime.sec = firstTimerHandlerPtr->time.sec - blockTime.sec;
|
|
|
|
|
blockTime.usec = firstTimerHandlerPtr->time.usec - blockTime.usec;
|
|
|
|
|
if (blockTime.usec < 0) {
|
|
|
|
|
blockTime.sec -= 1;
|
|
|
|
|
blockTime.usec += 1000000;
|
|
|
|
|
}
|
|
|
|
|
if (blockTime.sec < 0) {
|
|
|
|
|
blockTime.sec = 0;
|
|
|
|
|
blockTime.usec = 0;
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
/*
|
|
|
|
|
* If the first timer has expired, stick an event on the queue.
|
|
|
|
|
*/
|
|
|
|
|
|
|
|
|
|
if (blockTime.sec == 0 && blockTime.usec == 0 && !timerPending) {
|
|
|
|
|
timerPending = 1;
|
|
|
|
|
timerEvPtr = (Tcl_Event *) ckalloc(sizeof(Tcl_Event));
|
|
|
|
|
timerEvPtr->proc = TimerHandlerEventProc;
|
|
|
|
|
Tcl_QueueEvent(timerEvPtr, TCL_QUEUE_TAIL);
|
|
|
|
|
}
|
|
|
|
|
}
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
/*
|
|
|
|
|
*----------------------------------------------------------------------
|
|
|
|
|
*
|
|
|
|
|
* TimerHandlerEventProc --
|
|
|
|
|
*
|
|
|
|
|
* This procedure is called by Tcl_ServiceEvent when a timer event
|
|
|
|
|
* reaches the front of the event queue. This procedure handles
|
|
|
|
|
* the event by invoking the callbacks for all timers that are
|
|
|
|
|
* ready.
|
|
|
|
|
*
|
|
|
|
|
* Results:
|
|
|
|
|
* Returns 1 if the event was handled, meaning it should be removed
|
|
|
|
|
* from the queue. Returns 0 if the event was not handled, meaning
|
|
|
|
|
* it should stay on the queue. The only time the event isn't
|
|
|
|
|
* handled is if the TCL_TIMER_EVENTS flag bit isn't set.
|
|
|
|
|
*
|
|
|
|
|
* Side effects:
|
|
|
|
|
* Whatever the timer handler callback procedures do.
|
|
|
|
|
*
|
|
|
|
|
*----------------------------------------------------------------------
|
|
|
|
|
*/
|
|
|
|
|
|
|
|
|
|
static int
|
|
|
|
|
TimerHandlerEventProc(evPtr, flags)
|
|
|
|
|
Tcl_Event *evPtr; /* Event to service. */
|
|
|
|
|
int flags; /* Flags that indicate what events to
|
|
|
|
|
* handle, such as TCL_FILE_EVENTS. */
|
|
|
|
|
{
|
|
|
|
|
TimerHandler *timerHandlerPtr, **nextPtrPtr;
|
|
|
|
|
Tcl_Time time;
|
|
|
|
|
int currentTimerId;
|
|
|
|
|
|
|
|
|
|
/*
|
|
|
|
|
* Do nothing if timers aren't enabled. This leaves the event on the
|
|
|
|
|
* queue, so we will get to it as soon as ServiceEvents() is called
|
|
|
|
|
* with timers enabled.
|
|
|
|
|
*/
|
|
|
|
|
|
|
|
|
|
if (!(flags & TCL_TIMER_EVENTS)) {
|
|
|
|
|
return 0;
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
/*
|
|
|
|
|
* The code below is trickier than it may look, for the following
|
|
|
|
|
* reasons:
|
|
|
|
|
*
|
|
|
|
|
* 1. New handlers can get added to the list while the current
|
|
|
|
|
* one is being processed. If new ones get added, we don't
|
|
|
|
|
* want to process them during this pass through the list to avoid
|
|
|
|
|
* starving other event sources. This is implemented using the
|
|
|
|
|
* token number in the handler: new handlers will have a
|
|
|
|
|
* newer token than any of the ones currently on the list.
|
|
|
|
|
* 2. The handler can call Tcl_DoOneEvent, so we have to remove
|
|
|
|
|
* the handler from the list before calling it. Otherwise an
|
|
|
|
|
* infinite loop could result.
|
|
|
|
|
* 3. Tcl_DeleteTimerHandler can be called to remove an element from
|
|
|
|
|
* the list while a handler is executing, so the list could
|
|
|
|
|
* change structure during the call.
|
|
|
|
|
* 4. Because we only fetch the current time before entering the loop,
|
|
|
|
|
* the only way a new timer will even be considered runnable is if
|
|
|
|
|
* its expiration time is within the same millisecond as the
|
|
|
|
|
* current time. This is fairly likely on Windows, since it has
|
|
|
|
|
* a course granularity clock. Since timers are placed
|
|
|
|
|
* on the queue in time order with the most recently created
|
|
|
|
|
* handler appearing after earlier ones with the same expiration
|
|
|
|
|
* time, we don't have to worry about newer generation timers
|
|
|
|
|
* appearing before later ones.
|
|
|
|
|
*/
|
|
|
|
|
|
|
|
|
|
timerPending = 0;
|
|
|
|
|
currentTimerId = lastTimerId;
|
|
|
|
|
TclpGetTime(&time);
|
|
|
|
|
while (1) {
|
|
|
|
|
nextPtrPtr = &firstTimerHandlerPtr;
|
|
|
|
|
timerHandlerPtr = firstTimerHandlerPtr;
|
|
|
|
|
if (timerHandlerPtr == NULL) {
|
|
|
|
|
break;
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
if ((timerHandlerPtr->time.sec > time.sec)
|
|
|
|
|
|| ((timerHandlerPtr->time.sec == time.sec)
|
|
|
|
|
&& (timerHandlerPtr->time.usec > time.usec))) {
|
|
|
|
|
break;
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
/*
|
|
|
|
|
* Bail out if the next timer is of a newer generation.
|
|
|
|
|
*/
|
|
|
|
|
|
|
|
|
|
if ((currentTimerId - (int)timerHandlerPtr->token) < 0) {
|
|
|
|
|
break;
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
/*
|
|
|
|
|
* Remove the handler from the queue before invoking it,
|
|
|
|
|
* to avoid potential reentrancy problems.
|
|
|
|
|
*/
|
|
|
|
|
|
|
|
|
|
(*nextPtrPtr) = timerHandlerPtr->nextPtr;
|
|
|
|
|
(*timerHandlerPtr->proc)(timerHandlerPtr->clientData);
|
|
|
|
|
ckfree((char *) timerHandlerPtr);
|
|
|
|
|
}
|
|
|
|
|
TimerSetupProc(NULL, TCL_TIMER_EVENTS);
|
|
|
|
|
return 1;
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
/*
|
|
|
|
|
*--------------------------------------------------------------
|
|
|
|
|
*
|
|
|
|
|
* Tcl_DoWhenIdle --
|
|
|
|
|
*
|
|
|
|
|
* Arrange for proc to be invoked the next time the system is
|
|
|
|
|
* idle (i.e., just before the next time that Tcl_DoOneEvent
|
|
|
|
|
* would have to wait for something to happen).
|
|
|
|
|
*
|
|
|
|
|
* Results:
|
|
|
|
|
* None.
|
|
|
|
|
*
|
|
|
|
|
* Side effects:
|
|
|
|
|
* Proc will eventually be called, with clientData as argument.
|
|
|
|
|
* See the manual entry for details.
|
|
|
|
|
*
|
|
|
|
|
*--------------------------------------------------------------
|
|
|
|
|
*/
|
|
|
|
|
|
|
|
|
|
void
|
|
|
|
|
Tcl_DoWhenIdle(proc, clientData)
|
|
|
|
|
Tcl_IdleProc *proc; /* Procedure to invoke. */
|
|
|
|
|
ClientData clientData; /* Arbitrary value to pass to proc. */
|
|
|
|
|
{
|
|
|
|
|
register IdleHandler *idlePtr;
|
|
|
|
|
Tcl_Time blockTime;
|
|
|
|
|
|
|
|
|
|
if (!initialized) {
|
|
|
|
|
InitTimer();
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
idlePtr = (IdleHandler *) ckalloc(sizeof(IdleHandler));
|
|
|
|
|
idlePtr->proc = proc;
|
|
|
|
|
idlePtr->clientData = clientData;
|
|
|
|
|
idlePtr->generation = idleGeneration;
|
|
|
|
|
idlePtr->nextPtr = NULL;
|
|
|
|
|
if (lastIdlePtr == NULL) {
|
|
|
|
|
idleList = idlePtr;
|
|
|
|
|
} else {
|
|
|
|
|
lastIdlePtr->nextPtr = idlePtr;
|
|
|
|
|
}
|
|
|
|
|
lastIdlePtr = idlePtr;
|
|
|
|
|
|
|
|
|
|
blockTime.sec = 0;
|
|
|
|
|
blockTime.usec = 0;
|
|
|
|
|
Tcl_SetMaxBlockTime(&blockTime);
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
/*
|
|
|
|
|
*----------------------------------------------------------------------
|
|
|
|
|
*
|
|
|
|
|
* Tcl_CancelIdleCall --
|
|
|
|
|
*
|
|
|
|
|
* If there are any when-idle calls requested to a given procedure
|
|
|
|
|
* with given clientData, cancel all of them.
|
|
|
|
|
*
|
|
|
|
|
* Results:
|
|
|
|
|
* None.
|
|
|
|
|
*
|
|
|
|
|
* Side effects:
|
|
|
|
|
* If the proc/clientData combination were on the when-idle list,
|
|
|
|
|
* they are removed so that they will never be called.
|
|
|
|
|
*
|
|
|
|
|
*----------------------------------------------------------------------
|
|
|
|
|
*/
|
|
|
|
|
|
|
|
|
|
void
|
|
|
|
|
Tcl_CancelIdleCall(proc, clientData)
|
|
|
|
|
Tcl_IdleProc *proc; /* Procedure that was previously registered. */
|
|
|
|
|
ClientData clientData; /* Arbitrary value to pass to proc. */
|
|
|
|
|
{
|
|
|
|
|
register IdleHandler *idlePtr, *prevPtr;
|
|
|
|
|
IdleHandler *nextPtr;
|
|
|
|
|
|
|
|
|
|
for (prevPtr = NULL, idlePtr = idleList; idlePtr != NULL;
|
|
|
|
|
prevPtr = idlePtr, idlePtr = idlePtr->nextPtr) {
|
|
|
|
|
while ((idlePtr->proc == proc)
|
|
|
|
|
&& (idlePtr->clientData == clientData)) {
|
|
|
|
|
nextPtr = idlePtr->nextPtr;
|
|
|
|
|
ckfree((char *) idlePtr);
|
|
|
|
|
idlePtr = nextPtr;
|
|
|
|
|
if (prevPtr == NULL) {
|
|
|
|
|
idleList = idlePtr;
|
|
|
|
|
} else {
|
|
|
|
|
prevPtr->nextPtr = idlePtr;
|
|
|
|
|
}
|
|
|
|
|
if (idlePtr == NULL) {
|
|
|
|
|
lastIdlePtr = prevPtr;
|
|
|
|
|
return;
|
|
|
|
|
}
|
|
|
|
|
}
|
|
|
|
|
}
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
/*
|
|
|
|
|
*----------------------------------------------------------------------
|
|
|
|
|
*
|
|
|
|
|
* TclServiceIdle --
|
|
|
|
|
*
|
|
|
|
|
* This procedure is invoked by the notifier when it becomes
|
|
|
|
|
* idle. It will invoke all idle handlers that are present at
|
|
|
|
|
* the time the call is invoked, but not those added during idle
|
|
|
|
|
* processing.
|
|
|
|
|
*
|
|
|
|
|
* Results:
|
|
|
|
|
* The return value is 1 if TclServiceIdle found something to
|
|
|
|
|
* do, otherwise return value is 0.
|
|
|
|
|
*
|
|
|
|
|
* Side effects:
|
|
|
|
|
* Invokes all pending idle handlers.
|
|
|
|
|
*
|
|
|
|
|
*----------------------------------------------------------------------
|
|
|
|
|
*/
|
|
|
|
|
|
|
|
|
|
int
|
|
|
|
|
TclServiceIdle()
|
|
|
|
|
{
|
|
|
|
|
IdleHandler *idlePtr;
|
|
|
|
|
int oldGeneration;
|
|
|
|
|
Tcl_Time blockTime;
|
|
|
|
|
|
|
|
|
|
if (idleList == NULL) {
|
|
|
|
|
return 0;
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
oldGeneration = idleGeneration;
|
|
|
|
|
idleGeneration++;
|
|
|
|
|
|
|
|
|
|
/*
|
|
|
|
|
* The code below is trickier than it may look, for the following
|
|
|
|
|
* reasons:
|
|
|
|
|
*
|
|
|
|
|
* 1. New handlers can get added to the list while the current
|
|
|
|
|
* one is being processed. If new ones get added, we don't
|
|
|
|
|
* want to process them during this pass through the list (want
|
|
|
|
|
* to check for other work to do first). This is implemented
|
|
|
|
|
* using the generation number in the handler: new handlers
|
|
|
|
|
* will have a different generation than any of the ones currently
|
|
|
|
|
* on the list.
|
|
|
|
|
* 2. The handler can call Tcl_DoOneEvent, so we have to remove
|
|
|
|
|
* the handler from the list before calling it. Otherwise an
|
|
|
|
|
* infinite loop could result.
|
|
|
|
|
* 3. Tcl_CancelIdleCall can be called to remove an element from
|
|
|
|
|
* the list while a handler is executing, so the list could
|
|
|
|
|
* change structure during the call.
|
|
|
|
|
*/
|
|
|
|
|
|
|
|
|
|
for (idlePtr = idleList;
|
|
|
|
|
((idlePtr != NULL)
|
|
|
|
|
&& ((oldGeneration - idlePtr->generation) >= 0));
|
|
|
|
|
idlePtr = idleList) {
|
|
|
|
|
idleList = idlePtr->nextPtr;
|
|
|
|
|
if (idleList == NULL) {
|
|
|
|
|
lastIdlePtr = NULL;
|
|
|
|
|
}
|
|
|
|
|
(*idlePtr->proc)(idlePtr->clientData);
|
|
|
|
|
ckfree((char *) idlePtr);
|
|
|
|
|
}
|
|
|
|
|
if (idleList) {
|
|
|
|
|
blockTime.sec = 0;
|
|
|
|
|
blockTime.usec = 0;
|
|
|
|
|
Tcl_SetMaxBlockTime(&blockTime);
|
|
|
|
|
}
|
|
|
|
|
return 1;
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
/*
|
|
|
|
|
*----------------------------------------------------------------------
|
|
|
|
|
*
|
|
|
|
|
* Tcl_AfterCmd --
|
|
|
|
|
*
|
|
|
|
|
* This procedure is invoked to process the "after" Tcl command.
|
|
|
|
|
* See the user documentation for details on what it does.
|
|
|
|
|
*
|
|
|
|
|
* Results:
|
|
|
|
|
* A standard Tcl result.
|
|
|
|
|
*
|
|
|
|
|
* Side effects:
|
|
|
|
|
* See the user documentation.
|
|
|
|
|
*
|
|
|
|
|
*----------------------------------------------------------------------
|
|
|
|
|
*/
|
|
|
|
|
|
|
|
|
|
/* ARGSUSED */
|
|
|
|
|
int
|
|
|
|
|
Tcl_AfterCmd(clientData, interp, argc, argv)
|
|
|
|
|
ClientData clientData; /* Points to the "tclAfter" assocData for
|
|
|
|
|
* this interpreter, or NULL if the assocData
|
|
|
|
|
* hasn't been created yet.*/
|
|
|
|
|
Tcl_Interp *interp; /* Current interpreter. */
|
|
|
|
|
int argc; /* Number of arguments. */
|
|
|
|
|
char **argv; /* Argument strings. */
|
|
|
|
|
{
|
|
|
|
|
/*
|
|
|
|
|
* The variable below is used to generate unique identifiers for
|
|
|
|
|
* after commands. This id can wrap around, which can potentially
|
|
|
|
|
* cause problems. However, there are not likely to be problems
|
|
|
|
|
* in practice, because after commands can only be requested to
|
|
|
|
|
* about a month in the future, and wrap-around is unlikely to
|
|
|
|
|
* occur in less than about 1-10 years. Thus it's unlikely that
|
|
|
|
|
* any old ids will still be around when wrap-around occurs.
|
|
|
|
|
*/
|
|
|
|
|
|
|
|
|
|
static int nextId = 1;
|
|
|
|
|
int ms;
|
|
|
|
|
AfterInfo *afterPtr;
|
1999-09-05 07:16:41 -04:00
|
|
|
|
#ifdef SCM_CODE
|
1998-04-10 06:59:06 -04:00
|
|
|
|
static int initialized = 0;
|
1999-09-05 07:16:41 -04:00
|
|
|
|
void *closure = (void *)-1;
|
1998-04-10 06:59:06 -04:00
|
|
|
|
AfterAssocData *assocPtr = &After_list;
|
|
|
|
|
#else
|
|
|
|
|
AfterAssocData *assocPtr = (AfterAssocData *) clientData;
|
|
|
|
|
Tcl_CmdInfo cmdInfo;
|
1998-09-30 07:11:02 -04:00
|
|
|
|
#endif
|
1998-04-10 06:59:06 -04:00
|
|
|
|
size_t length;
|
|
|
|
|
|
|
|
|
|
if (argc < 2) {
|
|
|
|
|
Tcl_AppendResult(interp, "wrong # args: should be \"",
|
|
|
|
|
argv[0], " option ?arg arg ...?\"", (char *) NULL);
|
|
|
|
|
return TCL_ERROR;
|
|
|
|
|
}
|
1999-09-05 07:16:41 -04:00
|
|
|
|
#ifdef SCM_CODE
|
1998-04-10 06:59:06 -04:00
|
|
|
|
if (!initialized) {
|
|
|
|
|
After_list.interp = interp; /* really useless !!!! */
|
|
|
|
|
After_list.firstAfterPtr = NULL;
|
|
|
|
|
initialized = 1;
|
|
|
|
|
}
|
|
|
|
|
#else
|
|
|
|
|
/*
|
|
|
|
|
* Create the "after" information associated for this interpreter,
|
|
|
|
|
* if it doesn't already exist. Associate it with the command too,
|
|
|
|
|
* so that it will be passed in as the ClientData argument in the
|
|
|
|
|
* future.
|
|
|
|
|
*/
|
|
|
|
|
|
|
|
|
|
if (assocPtr == NULL) {
|
|
|
|
|
assocPtr = (AfterAssocData *) ckalloc(sizeof(AfterAssocData));
|
|
|
|
|
assocPtr->interp = interp;
|
|
|
|
|
assocPtr->firstAfterPtr = NULL;
|
|
|
|
|
Tcl_SetAssocData(interp, "tclAfter", AfterCleanupProc,
|
|
|
|
|
(ClientData) assocPtr);
|
|
|
|
|
cmdInfo.proc = Tcl_AfterCmd;
|
|
|
|
|
cmdInfo.clientData = (ClientData) assocPtr;
|
|
|
|
|
cmdInfo.objProc = NULL;
|
|
|
|
|
cmdInfo.objClientData = (ClientData) NULL;
|
|
|
|
|
cmdInfo.deleteProc = NULL;
|
|
|
|
|
cmdInfo.deleteData = (ClientData) assocPtr;
|
|
|
|
|
Tcl_SetCommandInfo(interp, argv[0], &cmdInfo);
|
|
|
|
|
}
|
|
|
|
|
#endif
|
|
|
|
|
/*
|
|
|
|
|
* Parse the command.
|
|
|
|
|
*/
|
|
|
|
|
|
|
|
|
|
length = strlen(argv[1]);
|
|
|
|
|
if (isdigit(UCHAR(argv[1][0]))) {
|
|
|
|
|
if (Tcl_GetInt(interp, argv[1], &ms) != TCL_OK) {
|
|
|
|
|
return TCL_ERROR;
|
|
|
|
|
}
|
|
|
|
|
if (ms < 0) {
|
|
|
|
|
ms = 0;
|
|
|
|
|
}
|
|
|
|
|
if (argc == 2) {
|
|
|
|
|
Tcl_Sleep(ms);
|
|
|
|
|
return TCL_OK;
|
|
|
|
|
}
|
|
|
|
|
afterPtr = (AfterInfo *) ckalloc((unsigned) (sizeof(AfterInfo)));
|
|
|
|
|
afterPtr->assocPtr = assocPtr;
|
|
|
|
|
if (argc == 3) {
|
1999-09-05 07:16:41 -04:00
|
|
|
|
#ifdef SCM_CODE
|
|
|
|
|
# ifdef STk_CODE
|
1998-04-10 06:59:06 -04:00
|
|
|
|
if (!STk_valid_callback(argv[2], &closure)) {
|
1999-09-05 07:16:41 -04:00
|
|
|
|
# else
|
|
|
|
|
if (!SCM_valid_callback(argv[2], &closure)) {
|
|
|
|
|
# endif
|
1998-04-10 06:59:06 -04:00
|
|
|
|
Tcl_AppendResult(interp, "bad closure specification \"",
|
|
|
|
|
argv[2], "\"", (char *) NULL);
|
|
|
|
|
return TCL_ERROR;
|
|
|
|
|
}
|
|
|
|
|
#endif
|
|
|
|
|
afterPtr->command = (char *) ckalloc((unsigned)
|
|
|
|
|
(strlen(argv[2]) + 1));
|
|
|
|
|
strcpy(afterPtr->command, argv[2]);
|
|
|
|
|
} else {
|
1999-09-05 07:16:41 -04:00
|
|
|
|
#ifdef SCM_CODE
|
1998-04-10 06:59:06 -04:00
|
|
|
|
Tcl_AppendResult(interp, "wrong # args: should be \"",
|
|
|
|
|
argv[0], " ms [script]\"", (char *) NULL);
|
|
|
|
|
return TCL_ERROR;
|
|
|
|
|
#else
|
|
|
|
|
afterPtr->command = Tcl_Concat(argc-2, argv+2);
|
|
|
|
|
#endif
|
|
|
|
|
}
|
|
|
|
|
afterPtr->id = nextId;
|
|
|
|
|
nextId += 1;
|
|
|
|
|
afterPtr->token = Tcl_CreateTimerHandler(ms, AfterProc,
|
|
|
|
|
(ClientData) afterPtr);
|
|
|
|
|
afterPtr->nextPtr = assocPtr->firstAfterPtr;
|
|
|
|
|
assocPtr->firstAfterPtr = afterPtr;
|
1999-09-05 07:16:41 -04:00
|
|
|
|
#ifdef BGLK_CODE
|
|
|
|
|
sprintf(interp->result, "after.%d", afterPtr->id);
|
|
|
|
|
#else
|
1998-04-10 06:59:06 -04:00
|
|
|
|
sprintf(interp->result, "after#%d", afterPtr->id);
|
1999-09-05 07:16:41 -04:00
|
|
|
|
#endif
|
|
|
|
|
#ifdef SCM_CODE
|
1998-04-10 06:59:06 -04:00
|
|
|
|
if (closure != NULL)
|
1998-09-30 07:11:02 -04:00
|
|
|
|
/* Register the callback to prevent it to be GC'ed */
|
1999-09-05 07:16:41 -04:00
|
|
|
|
# ifdef STk_CODE
|
1998-04-10 06:59:06 -04:00
|
|
|
|
STk_add_callback(interp->result, "", "", closure);
|
1999-09-05 07:16:41 -04:00
|
|
|
|
# else
|
|
|
|
|
SCM_add_callback(interp->result, "", "", closure);
|
|
|
|
|
# endif
|
1998-04-10 06:59:06 -04:00
|
|
|
|
#endif
|
|
|
|
|
} else if (strncmp(argv[1], "cancel", length) == 0) {
|
|
|
|
|
char *arg;
|
|
|
|
|
|
|
|
|
|
if (argc < 3) {
|
|
|
|
|
Tcl_AppendResult(interp, "wrong # args: should be \"",
|
|
|
|
|
argv[0], " cancel id|command\"", (char *) NULL);
|
|
|
|
|
return TCL_ERROR;
|
|
|
|
|
}
|
1999-09-05 07:16:41 -04:00
|
|
|
|
#ifdef SCM_CODE
|
|
|
|
|
arg = argv[2];
|
|
|
|
|
#else
|
1998-04-10 06:59:06 -04:00
|
|
|
|
if (argc == 3) {
|
|
|
|
|
arg = argv[2];
|
|
|
|
|
} else {
|
|
|
|
|
arg = Tcl_Concat(argc-2, argv+2);
|
|
|
|
|
}
|
1999-09-05 07:16:41 -04:00
|
|
|
|
#endif
|
1998-04-10 06:59:06 -04:00
|
|
|
|
for (afterPtr = assocPtr->firstAfterPtr; afterPtr != NULL;
|
|
|
|
|
afterPtr = afterPtr->nextPtr) {
|
|
|
|
|
if (strcmp(afterPtr->command, arg) == 0) {
|
|
|
|
|
break;
|
|
|
|
|
}
|
|
|
|
|
}
|
|
|
|
|
if (afterPtr == NULL) {
|
|
|
|
|
afterPtr = GetAfterEvent(assocPtr, arg);
|
|
|
|
|
}
|
1999-09-05 07:16:41 -04:00
|
|
|
|
#ifndef SCM_CODE
|
1998-04-10 06:59:06 -04:00
|
|
|
|
if (arg != argv[2]) {
|
|
|
|
|
ckfree(arg);
|
|
|
|
|
}
|
|
|
|
|
#endif
|
|
|
|
|
if (afterPtr != NULL) {
|
|
|
|
|
if (afterPtr->token != NULL) {
|
|
|
|
|
Tcl_DeleteTimerHandler(afterPtr->token);
|
|
|
|
|
} else {
|
|
|
|
|
Tcl_CancelIdleCall(AfterProc, (ClientData) afterPtr);
|
|
|
|
|
}
|
|
|
|
|
FreeAfterPtr(afterPtr);
|
|
|
|
|
}
|
|
|
|
|
} else if ((strncmp(argv[1], "idle", length) == 0)
|
|
|
|
|
&& (length >= 2)) {
|
1999-09-05 07:16:41 -04:00
|
|
|
|
#ifdef SCM_CODE
|
1998-04-10 06:59:06 -04:00
|
|
|
|
if (argc != 3) {
|
|
|
|
|
Tcl_AppendResult(interp, "wrong # args: should be \"",
|
|
|
|
|
argv[0], " idle script\"", (char *) NULL);
|
|
|
|
|
return TCL_ERROR;
|
|
|
|
|
}
|
1999-09-05 07:16:41 -04:00
|
|
|
|
# ifdef STk_CODE
|
1998-04-10 06:59:06 -04:00
|
|
|
|
if (!STk_valid_callback(argv[2], &closure)) {
|
1999-09-05 07:16:41 -04:00
|
|
|
|
# else
|
|
|
|
|
if (!SCM_valid_callback(argv[2], &closure)) {
|
|
|
|
|
# endif
|
1998-04-10 06:59:06 -04:00
|
|
|
|
Tcl_AppendResult(interp, "bad closure specification \"",
|
|
|
|
|
argv[2], "\"", (char *) NULL);
|
|
|
|
|
return TCL_ERROR;
|
|
|
|
|
}
|
|
|
|
|
#else
|
|
|
|
|
if (argc < 3) {
|
|
|
|
|
Tcl_AppendResult(interp, "wrong # args: should be \"",
|
|
|
|
|
argv[0], " idle script script ...\"", (char *) NULL);
|
|
|
|
|
return TCL_ERROR;
|
|
|
|
|
}
|
|
|
|
|
#endif
|
|
|
|
|
afterPtr = (AfterInfo *) ckalloc((unsigned) (sizeof(AfterInfo)));
|
|
|
|
|
afterPtr->assocPtr = assocPtr;
|
1999-09-05 07:16:41 -04:00
|
|
|
|
#ifdef SCM_CODE
|
1998-04-10 06:59:06 -04:00
|
|
|
|
afterPtr->command = (char *) ckalloc((unsigned) (strlen(argv[2]) + 1));
|
|
|
|
|
strcpy(afterPtr->command, argv[2]);
|
|
|
|
|
#else
|
|
|
|
|
if (argc == 3) {
|
|
|
|
|
afterPtr->command = (char *) ckalloc((unsigned)
|
|
|
|
|
(strlen(argv[2]) + 1));
|
|
|
|
|
strcpy(afterPtr->command, argv[2]);
|
|
|
|
|
} else {
|
|
|
|
|
afterPtr->command = Tcl_Concat(argc-2, argv+2);
|
|
|
|
|
}
|
|
|
|
|
#endif
|
|
|
|
|
afterPtr->id = nextId;
|
|
|
|
|
nextId += 1;
|
|
|
|
|
afterPtr->token = NULL;
|
|
|
|
|
afterPtr->nextPtr = assocPtr->firstAfterPtr;
|
|
|
|
|
assocPtr->firstAfterPtr = afterPtr;
|
|
|
|
|
Tcl_DoWhenIdle(AfterProc, (ClientData) afterPtr);
|
1999-09-05 07:16:41 -04:00
|
|
|
|
#ifdef BGLK_CODE
|
|
|
|
|
sprintf(interp->result, "after.%d", afterPtr->id);
|
|
|
|
|
#else
|
1998-04-10 06:59:06 -04:00
|
|
|
|
sprintf(interp->result, "after#%d", afterPtr->id);
|
1999-09-05 07:16:41 -04:00
|
|
|
|
#endif
|
|
|
|
|
#ifdef SCM_CODE
|
1998-04-10 06:59:06 -04:00
|
|
|
|
if (closure != NULL)
|
|
|
|
|
/* Register the callback to prevent it to be GC'ed */
|
1999-09-05 07:16:41 -04:00
|
|
|
|
# ifdef STk_CODE
|
1998-04-10 06:59:06 -04:00
|
|
|
|
STk_add_callback(interp->result, "", "", closure);
|
1999-09-05 07:16:41 -04:00
|
|
|
|
# else
|
|
|
|
|
SCM_add_callback(interp->result, "", "", closure);
|
|
|
|
|
# endif
|
1998-04-10 06:59:06 -04:00
|
|
|
|
#endif
|
|
|
|
|
} else if ((strncmp(argv[1], "info", length) == 0)
|
|
|
|
|
&& (length >= 2)) {
|
|
|
|
|
if (argc == 2) {
|
|
|
|
|
char buffer[30];
|
|
|
|
|
|
1999-09-05 07:16:41 -04:00
|
|
|
|
#ifdef SCM_CODE
|
1998-04-10 06:59:06 -04:00
|
|
|
|
Tcl_AppendResult(interp, "(", NULL);
|
|
|
|
|
#endif
|
|
|
|
|
for (afterPtr = assocPtr->firstAfterPtr; afterPtr != NULL;
|
|
|
|
|
afterPtr = afterPtr->nextPtr) {
|
|
|
|
|
if (assocPtr->interp == interp) {
|
1999-09-05 07:16:41 -04:00
|
|
|
|
#ifdef BGLK_CODE
|
|
|
|
|
sprintf(buffer, "after.%d", afterPtr->id);
|
|
|
|
|
#else
|
1998-04-10 06:59:06 -04:00
|
|
|
|
sprintf(buffer, "after#%d", afterPtr->id);
|
1999-09-05 07:16:41 -04:00
|
|
|
|
#endif
|
1998-04-10 06:59:06 -04:00
|
|
|
|
Tcl_AppendElement(interp, buffer);
|
|
|
|
|
}
|
|
|
|
|
}
|
1999-09-05 07:16:41 -04:00
|
|
|
|
#ifdef SCM_CODE
|
1998-04-10 06:59:06 -04:00
|
|
|
|
Tcl_AppendResult(interp, ")", NULL);
|
|
|
|
|
#endif
|
|
|
|
|
return TCL_OK;
|
|
|
|
|
}
|
|
|
|
|
if (argc != 3) {
|
|
|
|
|
Tcl_AppendResult(interp, "wrong # args: should be \"",
|
|
|
|
|
argv[0], " info ?id?\"", (char *) NULL);
|
|
|
|
|
return TCL_ERROR;
|
|
|
|
|
}
|
|
|
|
|
afterPtr = GetAfterEvent(assocPtr, argv[2]);
|
|
|
|
|
if (afterPtr == NULL) {
|
|
|
|
|
Tcl_AppendResult(interp, "event \"", argv[2],
|
|
|
|
|
"\" doesn't exist", (char *) NULL);
|
|
|
|
|
return TCL_ERROR;
|
|
|
|
|
}
|
|
|
|
|
Tcl_AppendElement(interp, afterPtr->command);
|
|
|
|
|
Tcl_AppendElement(interp,
|
|
|
|
|
(afterPtr->token == NULL) ? "idle" : "timer");
|
|
|
|
|
} else {
|
|
|
|
|
Tcl_AppendResult(interp, "bad argument \"", argv[1],
|
|
|
|
|
"\": must be cancel, idle, info, or a number",
|
|
|
|
|
(char *) NULL);
|
|
|
|
|
return TCL_ERROR;
|
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|
|
|
}
|
|
|
|
|
return TCL_OK;
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
/*
|
|
|
|
|
*----------------------------------------------------------------------
|
|
|
|
|
*
|
|
|
|
|
* GetAfterEvent --
|
|
|
|
|
*
|
|
|
|
|
* This procedure parses an "after" id such as "after#4" and
|
|
|
|
|
* returns a pointer to the AfterInfo structure.
|
|