t.init(goroutineReady, gp)
		gp.timer = t
	}
	when := nanotime() + ns
	if when < 0 { // check for overflow.
		when = maxWhen
	}
	gp.sleepWhen = when
	gopark(resetForSleep, nil, waitReasonSleep, traceBlockSleep, 1)
}

// resetForSleep is called after the goroutine is parked for timeSleep.
// We can't call timer.reset in timeSleep itself because if this is a short