// the signal(s) in question, and here we are just waiting to make sure
// that all the signals have been delivered to the user channels
// by the os/signal package.
//
//go:linkname signalWaitUntilIdle os/signal.signalWaitUntilIdle
func signalWaitUntilIdle() {
	// Although the signals we care about have been removed from
	// sig.wanted, it is possible that another thread has received

	// channels being stopped and wait for signal delivery to
	// quiesce before fully removing it.

	handlers.stopping = append(handlers.stopping, stopping{c, h})

	handlers.Unlock()

	signalWaitUntilIdle()

	handlers.Lock()

	for i, s := range handlers.stopping {
		if s.c == c {
			handlers.stopping = append(handlers.stopping[:i], handlers.stopping[i+1:]...)
			break
		}
	}