select {
			case <-C:
				return
			default:
			}
			Sleep(sched)
		}
	}

	// drainAsync removes potential stale time values after Stop/Reset.
	// When using Go 1 async timers, draining one or two values
	// may be needed after Reset or Stop (see comments in body for details).
	drainAsync := func() {
		if synctimerchan {
			// sync timers must have the right semantics without draining: