}

// netpollAnyWaiters reports whether any goroutines are waiting for I/O.
func netpollAnyWaiters() bool {
	return netpollWaiters.Load() > 0
}

// netpollAdjustWaiters adds delta to netpollWaiters.
func netpollAdjustWaiters(delta int32) {
	if delta != 0 {
		netpollWaiters.Add(delta)
	}
}

func (c *pollCache) alloc() *pollDesc {
	lock(&c.lock)
	if c.first == nil {