Tcl_Condition waitCV;	/* Any other thread alerts a notifier that an
				 * event is ready to be processed by signaling
				 * this condition variable. */
#endif /* __CYGWIN__ */
    int eventReady;		/* True if an event is ready to be processed.
				 * Used as condition flag together with waitCV
				 * above. */
#endif
#endif /* TCL_THREADS */
} ThreadSpecificData;

static Tcl_ThreadDataKey dataKey;

#ifdef TCL_THREADS
/*
 * The following static indicates the number of threads that have initialized
 * notifiers.
 *
 * You must hold the notifierMutex lock before accessing this variable.
 */

static int notifierCount = 0;

/*
 * The following static stores the process ID of the initialized notifier
 * thread. If it changes, we have passed a fork and we should start a new
 * notifier thread.
 *
 * You must hold the notifierMutex lock before accessing this variable.
 */
static pid_t processIDInitialized = 0;

/*
 * The following variable points to the head of a doubly-linked list of
 * ThreadSpecificData structures for all threads that are currently waiting on
 * an event.
 *
 * You must hold the notifierMutex lock before accessing this list.
 */

/*
 * This is the thread ID of the notifier thread that does select.
 */

static Tcl_ThreadId notifierThread;

#endif
#endif /* TCL_THREADS */

/*
 * Static routines defined in this file.
 */

#ifdef TCL_THREADS
static void	NotifierThreadProc(ClientData clientData);

    tsdPtr->eventReady = 0;

    /*
     * Start the Notifier thread if necessary.
     */

    Tcl_MutexLock(&notifierMutex);
    /*
     * Check if my process id changed, e.g. I was forked
     * In this case, restart the notifier thread and close the
     * pipe to the original notifier thread
     */
    if (notifierCount > 0 && processIDInitialized != getpid()) {
	notifierCount = 0;
	processIDInitialized = 0;
	close(triggerPipe);
	triggerPipe = -1;
    }
    if (notifierCount == 0) {
	if (TclpThreadCreate(&notifierThread, NotifierThreadProc, NULL,
		TCL_THREAD_STACK_DEFAULT, TCL_THREAD_JOINABLE) != TCL_OK) {
	    Tcl_Panic("Tcl_InitNotifier: unable to start notifier thread");
	    processIDInitialized = getpid();
	}
    }
    notifierCount++;

    /*
     * Wait for the notifier pipe to be created.
     */

    while (triggerPipe < 0) {
	Tcl_ConditionWait(&notifierCV, &notifierMutex, NULL);
    }

    Tcl_MutexUnlock(&notifierMutex);
#endif
#endif /* TCL_THREADS */
    return (ClientData) tsdPtr;
}

/*
 *----------------------------------------------------------------------
 *
 * Tcl_FinalizeNotifier --