select {
		case <-C:
			done <- true
		case <-stop:
		}
		close(done2)
	}()
	Sleep(sched)
	notDone(done)
	tim.Reset(sched / 2)
	Sleep(sched)
	waitDone(done)
	tim.Stop()
	close(stop)
	waitDone(done1)
	waitDone(done2)
	if isTicker {
		// extra send might have sent done again
		// (handled by buffering done above).
		select {
		default:
		case <-done:
		}

		waitStart = make(chan struct{})
		waitDone  = make(chan result)
	)

	signal.Notify(sigCh, sig)

	go func() {
		n := 0
		alarm := time.After(time.Second * 3)
		for {
			select {
			case <-waitStart:
				waitStart = nil
			case v := <-sigCh:
				n++
				if v != sig || n > thres {
					waitDone <- result{n, v}
					return
				}
			case <-alarm: