說明

func make(t Type, size ...IntegerType) Type

指出該值在同一時刻最多可以容納 size 個元素值。

如果我們發送給該通道的元素值未被取走，那么該通道最多可以暫存（或者說緩沖）size 個元素值。

當發送第size +1個元素值后, 會造成當前Goroutine的堵塞(在chan<-時會卡住,等chan有空間時才可以<-并且進行后面的代碼)

示例

代碼

func HelloMakeChanSize() {size := 0c1 := make(chan int, size)go func() {for i := 0; i < 4; i++ {val := i*10 + 7fmt.Println(time.Now(), "<- ", val, "at", i)c1 <- i*10 + 7}c1 <- 0}()time.Sleep(time.Second * 3)fmt.Println("After Sleep")for val := range c1 {fmt.Println(time.Now(), "receive:", val)if val == 0 {break}} }

c1 := make(chan int,size)?中的size修改為不同值, 會有不同的輸出效果

無size 或 size=0 時的輸出結果

第一次c1<-時, 由于沒有立刻被取走func就會堵塞住,等3秒后c1被讀取才進行后面的代碼

2019-05-17 14:57:29.2314327 +0800 CST m=+0.003910401 <- 7 at 0 After Sleep 2019-05-17 14:57:32.2321627 +0800 CST m=+3.004754901 receive: 7 2019-05-17 14:57:32.2321627 +0800 CST m=+3.004754901 <- 17 at 1 2019-05-17 14:57:32.2321627 +0800 CST m=+3.004754901 <- 27 at 2 2019-05-17 14:57:32.2321627 +0800 CST m=+3.004754901 receive: 17 2019-05-17 14:57:32.2321627 +0800 CST m=+3.004754901 receive: 27 2019-05-17 14:57:32.2321627 +0800 CST m=+3.004754901 <- 37 at 3 2019-05-17 14:57:32.2321627 +0800 CST m=+3.004754901 receive: 37 2019-05-17 14:57:32.2321627 +0800 CST m=+3.004754901 receive: 0

size=1時的輸出結果

第二次c1<-時,由于第一個沒有取走, 會堵塞

2019-05-17 14:57:57.7795593 +0800 CST m=+0.004894501 <- 7 at 0 2019-05-17 14:57:57.819622 +0800 CST m=+0.044958701 <- 17 at 1 After Sleep 2019-05-17 14:58:00.7799573 +0800 CST m=+3.005407001 receive: 7 2019-05-17 14:58:00.7799573 +0800 CST m=+3.005407001 receive: 17 2019-05-17 14:58:00.7799573 +0800 CST m=+3.005407001 <- 27 at 2 2019-05-17 14:58:00.7799573 +0800 CST m=+3.005407001 <- 37 at 3 2019-05-17 14:58:00.7799573 +0800 CST m=+3.005407001 receive: 27 2019-05-17 14:58:00.7799573 +0800 CST m=+3.005407001 receive: 37 2019-05-17 14:58:00.7799573 +0800 CST m=+3.005407001 receive: 0

size=3時的輸出結果

2019-05-17 14:58:24.7116812 +0800 CST m=+0.004888401 <- 7 at 0 2019-05-17 14:58:24.7449182 +0800 CST m=+0.038126701 <- 17 at 1 2019-05-17 14:58:24.7449182 +0800 CST m=+0.038126701 <- 27 at 2 2019-05-17 14:58:24.7449182 +0800 CST m=+0.038126701 <- 37 at 3 After Sleep 2019-05-17 14:58:27.7108697 +0800 CST m=+3.004191401 receive: 7 2019-05-17 14:58:27.7108697 +0800 CST m=+3.004191401 receive: 17 2019-05-17 14:58:27.7108697 +0800 CST m=+3.004191401 receive: 27 2019-05-17 14:58:27.7108697 +0800 CST m=+3.004191401 receive: 37 2019-05-17 14:58:27.7108697 +0800 CST m=+3.004191401 receive: 0

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總結

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