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                **在使用channel中,有以下不方便的地方:** 1、在不改變channel自身狀態的情況下,是無法獲取一個channel是否為關閉的狀態; 2、關閉一個已經關閉的channel會導致panic; 3、向一個已經關閉的channel發送數據會導致pannic;以上兩種情況都是很危險的。 **如何關閉channel:** 1、使用`defer-recover`機制,可以大膽地關閉channel或者發送數據; 2、使用`sync.Once`保證只關閉一次。 **如何優雅地關閉channel:** 分為一下幾種情況: 1、一個sender,一個receiver 2、一個sender,多個receiver 3、多個sender,一個receiver 4、多個sender,多個receiver 前兩種情況只需要在sender端關閉即可。 對于第3種情況的解決方案為:增加一個傳遞關閉信號的channel,receiver通過信號channel下達關閉channel的指令。 ~~~ func main() { rand.Seed(time.Now().UnixNano()) const Max = 100000 const NumSenders = 1000 dataCh := make(chan int, 100) stopCh := make(chan struct{}) for i := 0; i < NumSenders; i++ { go func() { for { select { case <-stopCh: return case dataCh <- rand.Intn(Max): } } }() } go func() { for value := range dataCh { if value == Max-1 { fmt.Println("send stop signal to senders.") close(stopCh) return } fmt.Println(value) } }() select { case <-time.After(time.Hour): } } ~~~
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