c.connChange.L.Unlock()
		// Happy path.
		return nil
	}
	ctx, cancel := context.WithCancel(ctx)
	defer cancel()
	changed := make(chan State, 1)
	go func() {
		defer xioutil.SafeClose(changed)
		for {
			c.connChange.Wait()
			newState := c.State()
			select {
			case changed <- newState:
				if newState == StateConnected || newState == StateShutdown {
					c.connChange.L.Unlock()