type List struct {
	// contains filtered or unexported fields
}

type Wait interface {
	Register(id uint64) <-chan interface{}
	Trigger(id uint64, x interface{})
}

type WaitTime interface {
	// Wait returns a chan that waits on the given deadline.
	// The chan will be triggered when Trigger is called with a
	// deadline that is later than the one it is waiting for.
	// The given deadline MUST be unique. The deadline should be
	// retrieved by calling time.Now() in most cases.
	Wait(deadline time.Time) <-chan struct{}
	// Trigger triggers all the waiting chans with an earlier deadline.
	Trigger(deadline time.Time)
}