tclevent.c

linux系统下的音频通信

/*
 *----------------------------------------------------------------------
 *
 * BgErrorDeleteProc --
 *
 *	This procedure is associated with the "tclBgError" assoc data
 *	for an interpreter;  it is invoked when the interpreter is
 *	deleted in order to free the information assoicated with any
 *	pending error reports.
 *
 * Results:
 *	None.
 *
 * Side effects:
 *	Background error information is freed: if there were any
 *	pending error reports, they are cancelled.
 *
 *----------------------------------------------------------------------
 */

static void
BgErrorDeleteProc(clientData, interp)
    ClientData clientData;	/* Pointer to ErrAssocData structure. */
    Tcl_Interp *interp;		/* Interpreter being deleted. */
{
    ErrAssocData *assocPtr = (ErrAssocData *) clientData;
    BgError *errPtr;

    while (assocPtr->firstBgPtr != NULL) {
	errPtr = assocPtr->firstBgPtr;
	assocPtr->firstBgPtr = errPtr->nextPtr;
	ckfree(errPtr->errorMsg);
	ckfree(errPtr->errorInfo);
	ckfree(errPtr->errorCode);
	ckfree((char *) errPtr);
    }
    Tcl_CancelIdleCall(HandleBgErrors, (ClientData) assocPtr);
    Tcl_EventuallyFree((ClientData) assocPtr, TCL_DYNAMIC);
}

/*
 *----------------------------------------------------------------------
 *
 * Tcl_CreateExitHandler --
 *
 *	Arrange for a given procedure to be invoked just before the
 *	application exits.
 *
 * Results:
 *	None.
 *
 * Side effects:
 *	Proc will be invoked with clientData as argument when the
 *	application exits.
 *
 *----------------------------------------------------------------------
 */

void
Tcl_CreateExitHandler(proc, clientData)
    Tcl_ExitProc *proc;		/* Procedure to invoke. */
    ClientData clientData;	/* Arbitrary value to pass to proc. */
{
    ExitHandler *exitPtr;

    exitPtr = (ExitHandler *) ckalloc(sizeof(ExitHandler));
    exitPtr->proc = proc;
    exitPtr->clientData = clientData;
    exitPtr->nextPtr = firstExitPtr;
    firstExitPtr = exitPtr;
}

/*
 *----------------------------------------------------------------------
 *
 * Tcl_DeleteExitHandler --
 *
 *	This procedure cancels an existing exit handler matching proc
 *	and clientData, if such a handler exits.
 *
 * Results:
 *	None.
 *
 * Side effects:
 *	If there is an exit handler corresponding to proc and clientData
 *	then it is cancelled;  if no such handler exists then nothing
 *	happens.
 *
 *----------------------------------------------------------------------
 */

void
Tcl_DeleteExitHandler(proc, clientData)
    Tcl_ExitProc *proc;		/* Procedure that was previously registered. */
    ClientData clientData;	/* Arbitrary value to pass to proc. */
{
    ExitHandler *exitPtr, *prevPtr;

    for (prevPtr = NULL, exitPtr = firstExitPtr; exitPtr != NULL;
	    prevPtr = exitPtr, exitPtr = exitPtr->nextPtr) {
	if ((exitPtr->proc == proc)
		&& (exitPtr->clientData == clientData)) {
	    if (prevPtr == NULL) {
		firstExitPtr = exitPtr->nextPtr;
	    } else {
		prevPtr->nextPtr = exitPtr->nextPtr;
	    }
	    ckfree((char *) exitPtr);
	    return;
	}
    }
}

/*
 *----------------------------------------------------------------------
 *
 * Tcl_Exit --
 *
 *	This procedure is called to terminate the application.
 *
 * Results:
 *	None.
 *
 * Side effects:
 *	All existing exit handlers are invoked, then the application
 *	ends.
 *
 *----------------------------------------------------------------------
 */

void
Tcl_Exit(status)
    int status;			/* Exit status for application;  typically
				 * 0 for normal return, 1 for error return. */
{
    Tcl_Finalize();
#ifdef TCL_MEM_DEBUG
    if (tclMemDumpFileName != NULL) {
	Tcl_DumpActiveMemory(tclMemDumpFileName);
    }
#endif
    TclPlatformExit(status);
}

/*
 *----------------------------------------------------------------------
 *
 * Tcl_Finalize --
 *
 *	Runs the exit handlers to allow Tcl to clean up its state prior
 *	to being unloaded. Called by Tcl_Exit and when Tcl was dynamically
 *	loaded and is now being unloaded.
 *
 * Results:
 *	None.
 *
 * Side effects:
 *	Whatever the exit handlers do. Also frees up storage associated
 *	with the Tcl object type table.
 *
 *----------------------------------------------------------------------
 */

void
Tcl_Finalize()
{
    ExitHandler *exitPtr;
    
    /*
     * Invoke exit handler first.
     */

    tclInExit = 1;
    for (exitPtr = firstExitPtr; exitPtr != NULL; exitPtr = firstExitPtr) {
	/*
	 * Be careful to remove the handler from the list before invoking
	 * its callback.  This protects us against double-freeing if the
	 * callback should call Tcl_DeleteExitHandler on itself.
	 */

	firstExitPtr = exitPtr->nextPtr;
	(*exitPtr->proc)(exitPtr->clientData);
	ckfree((char *) exitPtr);
    }

    /*
     * Now finalize the Tcl execution environment.  Note that this must be done
     * after the exit handlers, because there are order dependencies.
     */
    
    TclFinalizeCompExecEnv();
    TclFinalizeEnvironment();
    TclpFinalize();
    firstExitPtr = NULL;
    tclInExit = 0;
}

/*
 *----------------------------------------------------------------------
 *
 * TclInExit --
 *
 *	Determines if we are in the middle of exit-time cleanup.
 *
 * Results:
 *	If we are in the middle of exiting, 1, otherwise 0.
 *
 * Side effects:
 *	None.
 *
 *----------------------------------------------------------------------
 */

int
TclInExit()
{
    return tclInExit;
}

/*
 *----------------------------------------------------------------------
 *
 * Tcl_VwaitCmd --
 *
 *	This procedure is invoked to process the "vwait" 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_VwaitCmd(clientData, interp, argc, argv)
    ClientData clientData;	/* Not used. */
    Tcl_Interp *interp;		/* Current interpreter. */
    int argc;			/* Number of arguments. */
    char **argv;		/* Argument strings. */
{
    int done, foundEvent;

    if (argc != 2) {
	Tcl_AppendResult(interp, "wrong # args: should be \"",
		argv[0], " name\"", (char *) NULL);
	return TCL_ERROR;
    }
    if (Tcl_TraceVar(interp, argv[1],
	    TCL_GLOBAL_ONLY|TCL_TRACE_WRITES|TCL_TRACE_UNSETS,
	    VwaitVarProc, (ClientData) &done) != TCL_OK) {
	return TCL_ERROR;
    };
    done = 0;
    foundEvent = 1;
    while (!done && foundEvent) {
	foundEvent = Tcl_DoOneEvent(TCL_ALL_EVENTS);
    }
    Tcl_UntraceVar(interp, argv[1],
	    TCL_GLOBAL_ONLY|TCL_TRACE_WRITES|TCL_TRACE_UNSETS,
	    VwaitVarProc, (ClientData) &done);

    /*
     * Clear out the interpreter's result, since it may have been set
     * by event handlers.
     */

    Tcl_ResetResult(interp);
    if (!foundEvent) {
	Tcl_AppendResult(interp, "can't wait for variable \"", argv[1],
		"\":  would wait forever", (char *) NULL);
	return TCL_ERROR;
    }
    return TCL_OK;
}

	/* ARGSUSED */
static char *
VwaitVarProc(clientData, interp, name1, name2, flags)
    ClientData clientData;	/* Pointer to integer to set to 1. */
    Tcl_Interp *interp;		/* Interpreter containing variable. */
    char *name1;		/* Name of variable. */
    char *name2;		/* Second part of variable name. */
    int flags;			/* Information about what happened. */
{
    int *donePtr = (int *) clientData;

    *donePtr = 1;
    return (char *) NULL;
}

/*
 *----------------------------------------------------------------------
 *
 * Tcl_UpdateCmd --
 *
 *	This procedure is invoked to process the "update" 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_UpdateCmd(clientData, interp, argc, argv)
    ClientData clientData;	/* Not used. */
    Tcl_Interp *interp;		/* Current interpreter. */
    int argc;			/* Number of arguments. */
    char **argv;		/* Argument strings. */
{
    int flags;

    if (argc == 1) {
	flags = TCL_ALL_EVENTS|TCL_DONT_WAIT;
    } else if (argc == 2) {
	if (strncmp(argv[1], "idletasks", strlen(argv[1])) != 0) {
	    Tcl_AppendResult(interp, "bad option \"", argv[1],
		    "\": must be idletasks", (char *) NULL);
	    return TCL_ERROR;
	}
	flags = TCL_WINDOW_EVENTS|TCL_IDLE_EVENTS|TCL_DONT_WAIT;
    } else {
	Tcl_AppendResult(interp, "wrong # args: should be \"",
		argv[0], " ?idletasks?\"", (char *) NULL);
	return TCL_ERROR;
    }

    while (Tcl_DoOneEvent(flags) != 0) {
	/* Empty loop body */
    }

    /*
     * Must clear the interpreter's result because event handlers could
     * have executed commands.
     */

    Tcl_ResetResult(interp);
    return TCL_OK;
}