throw("runtime: netpoll: bad port_alert wakeup")
			}
			if delay != 0 {
				// Now that a blocking call to netpoll
				// has seen the alert, take portfd
				// back out of alert mode.
				// See the comment in netpollBreak.
				if port_alert(portfd, 0, 0, 0) < 0 {
					e := errno()
					println("runtime: port_alert failed with", e)
					throw("runtime: netpoll: port_alert failed")
				}