package commander

func NewSemaphore(len int) Semaphore {
	if len == 0 {
		return nil
	}

	return make(Semaphore, len)
}

type Semaphore chan struct{}

func (s Semaphore) Acquire() {
	if s == nil {
		return
	}

	s <- struct{}{}
}

func (s Semaphore) Release() {
	if s == nil {
		return
	}

	<-s
}

func (s Semaphore) Close() {
	close(s)
}