* that an event is ready to be processed
	 * by sending this event. */
    void *hwnd;			/* Messaging window. */
#else /* !__CYGWIN__ */
    pthread_cond_t waitCV;	/* Any other thread alerts a notifier that an
				 * event is ready to be processed by signaling
				 * this condition variable. */
    int waitCVMono;		/* Mark wait monotonic based */
#endif /* __CYGWIN__ */
    int waitCVinitialized;	/* Variable to flag initialization of the structure */
    int eventReady;		/* > 0 if an event is ready to be processed.
				 * Used as condition flag together with waitCV
				 * above. */
#endif /* TCL_THREADS */
} ThreadSpecificData;

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

ClientData
Tcl_InitNotifier(void)
{
    ThreadSpecificData *tsdPtr = TCL_TSD_INIT(&dataKey);
    pthread_condattr_t wcvAttr, *wcvAttrPtr = NULL;

#ifdef TCL_THREADS
    tsdPtr->eventReady = 0;

    /*
     * Initialize thread specific condition variable for this thread.
     */

	RegisterClassW(&class);
	tsdPtr->hwnd = CreateWindowExW(NULL, class.lpszClassName,
		class.lpszClassName, 0, 0, 0, 0, 0, NULL, NULL,
		TclWinGetTclInstance(), NULL);
	tsdPtr->event = CreateEventW(NULL, 1 /* manual */,
		0 /* !signaled */, NULL);
#else
	pthread_condattr_init(&wcvAttr);
        if (pthread_condattr_setclock(&wcvAttr, CLOCK_MONOTONIC) == 0) {
	    /* we can use conditional wait monotonic based */
	    wcvAttrPtr = &wcvAttr;
	    tsdPtr->waitCVMono = 1;
        }
	pthread_cond_init(&tsdPtr->waitCV, wcvAttrPtr);
        (void)pthread_condattr_destroy(&wcvAttr);
#endif /* __CYGWIN__ */
	tsdPtr->waitCVinitialized = 1;
    }

    pthread_mutex_lock(&notifierInitMutex);
#if defined(HAVE_PTHREAD_ATFORK)
    /*

	else
	if (timePtr) {
	    struct timespec ptime;

	    /* TIP #233: Scale from virtual time to real-time  */
	    TclpScaleUTime(&waitTime);

	    clock_gettime(tsdPtr->waitCVMono ? 
		CLOCK_MONOTONIC : CLOCK_REALTIME, &ptime);
	    ptime.tv_sec += waitTime / 1000000;
	    ptime.tv_nsec += (waitTime % 1000000) * 1000;
	    if (ptime.tv_nsec > 1000000*1000) {
		ptime.tv_nsec -= 1000000*1000;
		ptime.tv_sec++;
	    }

#endif /* __APPLE__ && __LP64__ */

	    if (ptime.tv_nsec > 1000000*1000) {
		ptime.tv_nsec -= 1000000*1000;
		ptime.tv_sec++;
	    }
	    if (pthread_cond_timedwait(&tsdPtr->waitCV, &notifierMutex,
			&ptime) == ETIMEDOUT) {
		continue; /* repeat wait (if not yet real timeout) */
	    };
	} else {
	    pthread_cond_wait(&tsdPtr->waitCV, &notifierMutex);
	}
#endif /* __CYGWIN__ */