if (*mutexPtr == NULL) {
	pthread_mutex_lock(&masterLock);
	if (*mutexPtr == NULL) {
	    /*
	     * Double inside master lock check to avoid a race condition.
	     */

	    pmutexPtr = (PMutex *)ckalloc(sizeof(PMutex));
	    PMutexInit(pmutexPtr);
	    *mutexPtr = (Tcl_Mutex) pmutexPtr;
	    TclRememberMutex(mutexPtr);
	}
	pthread_mutex_unlock(&masterLock);
    }
    pmutexPtr = *((PMutex **) mutexPtr);

	/*
	 * Double check inside mutex to avoid race, then initialize condition
	 * variable if necessary.
	 */

	if (*condPtr == NULL) {
	    pcondPtr = (pthread_cond_t *)ckalloc(sizeof(pthread_cond_t));
	    pthread_cond_init(pcondPtr, NULL);
	    *condPtr = (Tcl_Condition) pcondPtr;
	    TclRememberCondition(condPtr);
	}
	pthread_mutex_unlock(&masterLock);
    }
    pmutexPtr = *((PMutex **) mutexPtr);

Tcl_Mutex *
TclpNewAllocMutex(void)
{
    AllocMutex *lockPtr;
    register PMutex *plockPtr;

    lockPtr = (AllocMutex *)malloc(sizeof(AllocMutex));
    if (lockPtr == NULL) {
	Tcl_Panic("could not allocate lock");
    }
    plockPtr = &lockPtr->plock;
    lockPtr->tlock = (Tcl_Mutex) plockPtr;
    PMutexInit(&lockPtr->plock);
    return &lockPtr->tlock;

#endif /* USE_THREAD_ALLOC */

void *
TclpThreadCreateKey(void)
{
    pthread_key_t *ptkeyPtr;

    ptkeyPtr = (pthread_key_t *)TclpSysAlloc(sizeof(pthread_key_t), 0);
    if (NULL == ptkeyPtr) {
	Tcl_Panic("unable to allocate thread key!");
    }

    if (pthread_key_create(ptkeyPtr, NULL)) {
	Tcl_Panic("unable to create pthread key!");
    }

    return ptkeyPtr;
}

void
TclpThreadDeleteKey(
    void *keyPtr)
{
    pthread_key_t *ptkeyPtr = (pthread_key_t *)keyPtr;

    if (pthread_key_delete(*ptkeyPtr)) {
	Tcl_Panic("unable to delete key!");
    }

    TclpSysFree(keyPtr);
}

void
TclpThreadSetMasterTSD(
    void *tsdKeyPtr,
    void *ptr)
{
    pthread_key_t *ptkeyPtr = (pthread_key_t *)tsdKeyPtr;

    if (pthread_setspecific(*ptkeyPtr, ptr)) {
	Tcl_Panic("unable to set master TSD value");
    }
}

void *
TclpThreadGetMasterTSD(
    void *tsdKeyPtr)
{
    pthread_key_t *ptkeyPtr = (pthread_key_t*)tsdKeyPtr;

    return pthread_getspecific(*ptkeyPtr);
}

#endif /* TCL_THREADS */

/*
 * Local Variables:
 * mode: c
 * c-basic-offset: 4
 * fill-column: 78
 * End:
 */