void Tcl_MutexLock( Tcl_Mutex *mutexPtr) /* Really (pthread_mutex_t **) */ { pthread_mutex_t *pmutexPtr; if (*mutexPtr == NULL) { MASTER_LOCK; if (*mutexPtr == NULL) { /* * Double inside master lock check to avoid a race condition. */ pmutexPtr = (pthread_mutex_t *)ckalloc(sizeof(pthread_mutex_t)); pthread_mutex_init(pmutexPtr, NULL); *mutexPtr = (Tcl_Mutex)pmutexPtr; TclRememberMutex(mutexPtr); } MASTER_UNLOCK; } pmutexPtr = *((pthread_mutex_t **)mutexPtr); pthread_mutex_lock(pmutexPtr); }
void Tcl_MutexLock( Tcl_Mutex *mutexPtr) /* The lock */ { CRITICAL_SECTION *csPtr; if (*mutexPtr == NULL) { MASTER_LOCK; /* * Double inside master lock check to avoid a race. */ if (*mutexPtr == NULL) { csPtr = (CRITICAL_SECTION *) ckalloc(sizeof(CRITICAL_SECTION)); InitializeCriticalSection(csPtr); *mutexPtr = (Tcl_Mutex)csPtr; TclRememberMutex(mutexPtr); } MASTER_UNLOCK; } csPtr = *((CRITICAL_SECTION **)mutexPtr); EnterCriticalSection(csPtr); }