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                ## WaitGroup `WaitGroup`用于等待一批 Go 協程執行結束。程序控制會一直阻塞,直到這些協程全部執行完畢 Go語言中可以使用sync.WaitGroup來實現并發任務的同步。 sync.WaitGroup有以下幾個方法: | 方法名 | 功能 | | --- | --- | | (wg \* WaitGroup) Add(delta int) | 計數器+delta | | (wg \*WaitGroup) Done() | 計數器-1 | | (wg \*WaitGroup) Wait() | 阻塞直到計數器變為0 | *注意:傳遞`WaitGroup`需要傳遞指針,如果沒有傳遞 WaitGroup 的地址,那么每個Go協程將會得到一個WaitGroup值的拷貝,當它們執行結束時主協程將不會知道子協程已處理完成* ~~~go func worker(wg *sync.WaitGroup) ~~~ 示例: ~~~ func TestLockConcurrent(t *testing.T){ var wt sync.WaitGroup var lock sync.Mutex counter := 0 for i := 0; i < 5000; i++ { wt.Add(1) go func() { defer func() { lock.Unlock() wt.Done() }() lock.Lock() counter += 1; }() } wt.Wait() //time.Sleep(1* time.Second) fmt.Println("counter:", counter) } ~~~
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