/*
 * This is the master lock used to serialize access to other serialization
 * data structures.
 */

static CRITICAL_SECTION masterLock;
static int initialized = 0;
static int init = 0;
#define MASTER_LOCK TclpMasterLock()
#define MASTER_UNLOCK TclpMasterUnlock()


/*
 * This is the master lock used to serialize initialization and finalization
 * of Tcl as a whole.
 */

static CRITICAL_SECTION initLock;

 *
 *----------------------------------------------------------------------
 */

void
TclpInitLock(void)
{
    if (!initialized) {
    if (!init) {
	/*
	 * There is a fundamental race here that is solved by creating the
	 * first Tcl interpreter in a single threaded environment. Once the
	 * interpreter has been created, it is safe to create more threads
	 * that create interpreters in parallel.
	 */

	initialized = 1;
	init = 1;
	InitializeCriticalSection(&joinLock);
	InitializeCriticalSection(&initLock);
	InitializeCriticalSection(&masterLock);
    }
    EnterCriticalSection(&initLock);
}


 *
 *----------------------------------------------------------------------
 */

void
TclpMasterLock(void)
{
    if (!initialized) {
    if (!init) {
	/*
	 * There is a fundamental race here that is solved by creating the
	 * first Tcl interpreter in a single threaded environment. Once the
	 * interpreter has been created, it is safe to create more threads
	 * that create interpreters in parallel.
	 */

	initialized = 1;
	init = 1;
	InitializeCriticalSection(&joinLock);
	InitializeCriticalSection(&initLock);
	InitializeCriticalSection(&masterLock);
    }
    EnterCriticalSection(&masterLock);
}


 *
 *----------------------------------------------------------------------
 */

void
TclFinalizeLock(void)
{
    TclpMasterLock();
    MASTER_LOCK;
    DeleteCriticalSection(&joinLock);

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

    DeleteCriticalSection(&masterLock);
    initialized = 0;
    init = 0;

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

void
Tcl_MutexLock(
    Tcl_Mutex *mutexPtr)	/* The lock */
{
    CRITICAL_SECTION *csPtr;

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

	/*
	 * 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();
	MASTER_UNLOCK;
    }
    csPtr = *((CRITICAL_SECTION **)mutexPtr);
    EnterCriticalSection(csPtr);
}

/*
 *----------------------------------------------------------------------

    /*
     * 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();
	MASTER_LOCK;

	/*
	 * 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();
	MASTER_UNLOCK;

	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();
	MASTER_LOCK;

	/*
	 * 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();
	MASTER_UNLOCK;
    }
    csPtr = *((CRITICAL_SECTION **)mutexPtr);
    winCondPtr = *((WinCondition **)condPtr);
    if (timePtr == NULL) {
	wtime = INFINITE;
    } else {
	wtime = timePtr->sec * 1000 + timePtr->usec / 1000;