golang用通道实现串口信号量

func NewPortAvailableSem()*PortAvailableSem{
	ps := &PortAvailableSem{
		PortChan: make(chan int, 1),
	}
	ps.PortChan <- 1
	return ps
}

type PortAvailableSem struct{
	PortChan chan int
}

func (ps *PortAvailableSem) Acquire(block bool, timeout int) bool{
	if block{
		ticker := time.NewTicker(time.Second*time.Duration(timeout))
		select{
		case  <- ps.PortChan:
			ticker.Stop()
			return true
		case <-ticker.C:
			return false
		}
	}else{
		select{
		case <- ps.PortChan:
			return true
		default:
			return false
		}
	}
	return false
}

func (ps *PortAvailableSem) Release(){
	if ps.Locked(){
		select{
			case ps.PortChan <- 1:
		}
	}
}

func (ps *PortAvailableSem) Locked() bool{
	return len(ps.PortChan) == 0
}