Go中chan是分阻塞和非阻塞(帶緩衝)的

建立非緩衝的chan

ch:=make(chan int)
ch<-1
fmt.Println("run")

執行會報：fatal error: all goroutines are asleep - deadlock!  因為這種方式建立的是非緩衝的chan

建立帶緩衝的chan

ch:=make(chan int,1)
ch<-1
fmt.Println("run")

緩衝數目少了同樣也會阻塞

ch:=make(chan int,1)
ch<-1
ch<-1
fmt.Println("run")
 

執行會報：fatal error: all goroutines are asleep - deadlock! 

使用chan進行協程優雅退出

go func(){
    for {
        select {
        case <-time.After(time.Second * 10):
        case <-this.signal:
            this.signal<-1
            return
        }
    }
}()

func (this *xxxx) Stop() {
	this.signal<-1
	<-this.signal
	close(this.signal)
}