* terminate the thread  and close the handles. If  the channel is
	     * nonblocking or may block during exit, bail out since the worker
	     * thread is not interruptible and we want TIP#398-fast-exit.
	     */
	    if ((pipePtr->flags & PIPE_ASYNC) && inExit) {

		/* give it a chance to leave honorably */
		TclPipeThreadStopSignal(&pipePtr->writeTI, pipePtr->writable);

		if (WaitForSingleObject(pipePtr->writable, 20) == WAIT_TIMEOUT) {
		    return EWOULDBLOCK;
		}

	    } else {

 *	1 if signaled (or pipe-thread is down), 0 if pipe thread still working.
 *
 *----------------------------------------------------------------------
 */

int
TclPipeThreadStopSignal(
    TclPipeThreadInfo **pipeTIPtr,
    HANDLE wakeEvent)
{
    TclPipeThreadInfo *pipeTI = *pipeTIPtr;
    HANDLE evControl;
    int state;

    if (!pipeTI) {
	return 1;