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);
}
void
Tcl_ConditionFinalize(
Tcl_Condition *condPtr)
{
#ifdef TCL_THREADS
TclpFinalizeCondition(condPtr);
#endif
TclpMasterLock();
ForgetSyncObject((char *) condPtr, &condRecord);
TclpMasterUnlock();
}
void
Tcl_MutexFinalize(
Tcl_Mutex *mutexPtr)
{
#ifdef TCL_THREADS
TclpFinalizeMutex(mutexPtr);
#endif
TclpMasterLock();
ForgetSyncObject((char *) mutexPtr, &mutexRecord);
TclpMasterUnlock();
}
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();
}
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);
}
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);
}
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 */
}
