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                變量counter會進行4次讀和寫操作,每個 goroutine 執行兩次。但是,程序終止時, counter變量的值為 2。 ~~~ var ( counter int wg sync.WaitGroup ) func main() { wg.Add(2) //等待兩個goroutine //創建兩個goroutine go inCounter(1) go inCounter(2) wg.Wait() //等待goroutine完成 fmt.Println("完成", counter) } func inCounter(id int) { defer wg.Done() for count := 0; count < 2; count++ { value := counter //捕獲counter的值 runtime.Gosched() //從線程退出,并放回到隊列 value ++ //增加本地value的值 counter = value //將該值保存回counter } } ~~~ ![](https://box.kancloud.cn/d70760e85d4b4dc5439feeff0284b0e7_802x521.png)
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