//
//	c.L.Lock()
//	for !condition() {
//	    c.Wait()
//	}
//	... make use of condition ...
//	c.L.Unlock()
func (c *Cond) Wait() {
	c.checker.check()
	t := runtime_notifyListAdd(&c.notify)
	c.L.Unlock()
	runtime_notifyListWait(&c.notify, t)
	c.L.Lock()
}

// Signal wakes one goroutine waiting on c, if there is any.
//
// It is allowed but not required for the caller to hold c.L