Beispiel #1
0
void
TclFinalizeLock(void)
{
    TclpMasterLock();
    DeleteCriticalSection(&joinLock);

    /*
     * Destroy the critical section that we are holding!
     */

    DeleteCriticalSection(&masterLock);
    initialized = 0;

#ifdef TCL_THREADS
    if (allocOnce) {
	DeleteCriticalSection(&allocLock.crit);
	allocOnce = 0;
    }
#endif

    LeaveCriticalSection(&initLock);

    /*
     * Destroy the critical section that we were holding.
     */

    DeleteCriticalSection(&initLock);
}
Beispiel #2
0
void
Tcl_ConditionFinalize(
    Tcl_Condition *condPtr)
{
#ifdef TCL_THREADS
    TclpFinalizeCondition(condPtr);
#endif
    TclpMasterLock();
    ForgetSyncObject((char *) condPtr, &condRecord);
    TclpMasterUnlock();
}
Beispiel #3
0
void
Tcl_MutexFinalize(
    Tcl_Mutex *mutexPtr)
{
#ifdef TCL_THREADS
    TclpFinalizeMutex(mutexPtr);
#endif
    TclpMasterLock();
    ForgetSyncObject((char *) mutexPtr, &mutexRecord);
    TclpMasterUnlock();
}
Beispiel #4
0
void
TclMutexUnlockAndFinalize(
    Tcl_Mutex *mutexPtr)
{
    Tcl_Mutex mutex;
    TclpMasterLock();
    TclpMutexLock();
#ifdef TCL_THREADS
    mutex = *mutexPtr;
    *mutexPtr = NULL; /* Force it to be created again. */
    Tcl_MutexUnlock(&mutex);
    TclpFinalizeMutex(&mutex);
#endif
    ForgetSyncObject(mutexPtr, &mutexRecord);
    TclpMutexUnlock();
    TclpMasterUnlock();
}
Beispiel #5
0
void
Tcl_MutexLock(
    Tcl_Mutex *mutexPtr)	/* The lock */
{
    CRITICAL_SECTION *csPtr;

    if (*mutexPtr == NULL) {
	TclpMasterLock();

	/*
	 * Double inside master lock check to avoid a race.
	 */

	if (*mutexPtr == NULL) {
	    csPtr = ckalloc(sizeof(CRITICAL_SECTION));
	    InitializeCriticalSection(csPtr);
	    *mutexPtr = (Tcl_Mutex)csPtr;
	    TclRememberMutex(mutexPtr);
	}
	TclpMasterUnlock();
    }
    csPtr = *((CRITICAL_SECTION **)mutexPtr);
    EnterCriticalSection(csPtr);
}
Beispiel #6
0
void
Tcl_ConditionWait(
    Tcl_Condition *condPtr,	/* Really (WinCondition **) */
    Tcl_Mutex *mutexPtr,	/* Really (CRITICAL_SECTION **) */
    const Tcl_Time *timePtr) /* Timeout on waiting period */
{
    WinCondition *winCondPtr;	/* Per-condition queue head */
    CRITICAL_SECTION *csPtr;	/* Caller's Mutex, after casting */
    DWORD wtime;		/* Windows time value */
    int timeout;		/* True if we got a timeout */
    int doExit = 0;		/* True if we need to do exit setup */
    ThreadSpecificData *tsdPtr = TCL_TSD_INIT(&dataKey);

    /*
     * Self initialize the two parts of the condition. The per-condition and
     * per-thread parts need to be handled independently.
     */

    if (tsdPtr->flags == WIN_THREAD_UNINIT) {
	TclpMasterLock();

	/*
	 * Create the per-thread event and queue pointers.
	 */

	if (tsdPtr->flags == WIN_THREAD_UNINIT) {
	    tsdPtr->condEvent = CreateEvent(NULL, TRUE /* manual reset */,
		    FALSE /* non signaled */, NULL);
	    tsdPtr->nextPtr = NULL;
	    tsdPtr->prevPtr = NULL;
	    tsdPtr->flags = WIN_THREAD_RUNNING;
	    doExit = 1;
	}
	TclpMasterUnlock();

	if (doExit) {
	    /*
	     * Create a per-thread exit handler to clean up the condEvent. We
	     * must be careful to do this outside the Master Lock because
	     * Tcl_CreateThreadExitHandler uses its own ThreadSpecificData,
	     * and initializing that may drop back into the Master Lock.
	     */

	    Tcl_CreateThreadExitHandler(FinalizeConditionEvent, tsdPtr);
	}
    }

    if (*condPtr == NULL) {
	TclpMasterLock();

	/*
	 * Initialize the per-condition queue pointers and Mutex.
	 */

	if (*condPtr == NULL) {
	    winCondPtr = ckalloc(sizeof(WinCondition));
	    InitializeCriticalSection(&winCondPtr->condLock);
	    winCondPtr->firstPtr = NULL;
	    winCondPtr->lastPtr = NULL;
	    *condPtr = (Tcl_Condition) winCondPtr;
	    TclRememberCondition(condPtr);
	}
	TclpMasterUnlock();
    }
    csPtr = *((CRITICAL_SECTION **)mutexPtr);
    winCondPtr = *((WinCondition **)condPtr);
    if (timePtr == NULL) {
	wtime = INFINITE;
    } else {
	wtime = timePtr->sec * 1000 + timePtr->usec / 1000;
    }

    /*
     * Queue the thread on the condition, using the per-condition lock for
     * serialization.
     */

    tsdPtr->flags = WIN_THREAD_BLOCKED;
    tsdPtr->nextPtr = NULL;
    EnterCriticalSection(&winCondPtr->condLock);
    tsdPtr->prevPtr = winCondPtr->lastPtr;		/* A: */
    winCondPtr->lastPtr = tsdPtr;
    if (tsdPtr->prevPtr != NULL) {
	tsdPtr->prevPtr->nextPtr = tsdPtr;
    }
    if (winCondPtr->firstPtr == NULL) {
	winCondPtr->firstPtr = tsdPtr;
    }

    /*
     * Unlock the caller's mutex and wait for the condition, or a timeout.
     * There is a minor issue here in that we don't count down the timeout if
     * we get notified, but another thread grabs the condition before we do.
     * In that race condition we'll wait again for the full timeout. Timed
     * waits are dubious anyway. Either you have the locking protocol wrong
     * and are masking a deadlock, or you are using conditions to pause your
     * thread.
     */

    LeaveCriticalSection(csPtr);
    timeout = 0;
    while (!timeout && (tsdPtr->flags & WIN_THREAD_BLOCKED)) {
	ResetEvent(tsdPtr->condEvent);
	LeaveCriticalSection(&winCondPtr->condLock);
	if (WaitForSingleObjectEx(tsdPtr->condEvent, wtime,
		TRUE) == WAIT_TIMEOUT) {
	    timeout = 1;
	}
	EnterCriticalSection(&winCondPtr->condLock);
    }

    /*
     * Be careful on timeouts because the signal might arrive right around the
     * time limit and someone else could have taken us off the queue.
     */

    if (timeout) {
	if (tsdPtr->flags & WIN_THREAD_RUNNING) {
	    timeout = 0;
	} else {
	    /*
	     * When dequeuing, we can leave the tsdPtr->nextPtr and
	     * tsdPtr->prevPtr with dangling pointers because they are
	     * reinitialilzed w/out reading them when the thread is enqueued
	     * later.
	     */

	    if (winCondPtr->firstPtr == tsdPtr) {
		winCondPtr->firstPtr = tsdPtr->nextPtr;
	    } else {
		tsdPtr->prevPtr->nextPtr = tsdPtr->nextPtr;
	    }
	    if (winCondPtr->lastPtr == tsdPtr) {
		winCondPtr->lastPtr = tsdPtr->prevPtr;
	    } else {
		tsdPtr->nextPtr->prevPtr = tsdPtr->prevPtr;
	    }
	    tsdPtr->flags = WIN_THREAD_RUNNING;
	}
    }

    LeaveCriticalSection(&winCondPtr->condLock);
    EnterCriticalSection(csPtr);
}
Beispiel #7
0
void
TclFinalizeSynchronization(void)
{
    int i;
    void *blockPtr;
    Tcl_ThreadDataKey *keyPtr;
#ifdef TCL_THREADS
    Tcl_Mutex *mutexPtr;
    Tcl_Condition *condPtr;

    TclpMasterLock();
#endif

    /*
     * If we're running unthreaded, the TSD blocks are simply stored inside
     * their thread data keys. Free them here.
     */

    if (keyRecord.list != NULL) {
	for (i=0 ; i<keyRecord.num ; i++) {
	    keyPtr = (Tcl_ThreadDataKey *) keyRecord.list[i];
	    blockPtr = (void *) *keyPtr;
	    ckfree(blockPtr);
	}
	ckfree((char *) keyRecord.list);
	keyRecord.list = NULL;
    }
    keyRecord.max = 0;
    keyRecord.num = 0;
    
#ifdef TCL_THREADS
    /*
     * Call thread storage master cleanup.
     */

    TclFinalizeThreadStorage();

    for (i=0 ; i<mutexRecord.num ; i++) {
	mutexPtr = (Tcl_Mutex *)mutexRecord.list[i];
	if (mutexPtr != NULL) {
	    TclpFinalizeMutex(mutexPtr);
	}
    }
    if (mutexRecord.list != NULL) {
	ckfree((char *) mutexRecord.list);
	mutexRecord.list = NULL;
    }
    mutexRecord.max = 0;
    mutexRecord.num = 0;

    for (i=0 ; i<condRecord.num ; i++) {
	condPtr = (Tcl_Condition *) condRecord.list[i];
	if (condPtr != NULL) {
	    TclpFinalizeCondition(condPtr);
	}
    }
    if (condRecord.list != NULL) {
	ckfree((char *) condRecord.list);
	condRecord.list = NULL;
    }
    condRecord.max = 0;
    condRecord.num = 0;

    TclpMasterUnlock();
#endif /* TCL_THREADS */
}