【英文】Go语言协程之间的同步

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Preface

Go language achieves synchronization between goroutines through sync.WaitGroup.

Body

  • defer waitGroup.Done() is equivalent to defer waitGroup.Add(-1).
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package main

import "sync"

var waitGroup sync.WaitGroup

func task() {
    // Decrease waitGroup by 1 every time a goroutine is completed
    defer waitGroup.Done()
    ...
}

func main() {
    for i := 0; i < 3; i++ {
        go task()
        // Increase waitGroup counter by 1 every time a goroutine is created
        waitGroup.Add(1)
    }
    // Wait for all goroutines in waitGroup to complete
    waitGroup.Wait()
}

Completion

References

Bilibili - Guo Hongzhi - Lao Guo