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Go语言sync库和WaitGroup的使用

 5 years ago
source link: https://studygolang.com/articles/15298?amp%3Butm_medium=referral
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// code_041_sync_WaitGroup project main.go
package main

import (
    "fmt"
    "sync"
)

func main() {
    fmt.Println("Hello World!")
    var wg sync.WaitGroup
    wg.Add(2)
    go func() {
        defer wg.Done()
        for i := 0; i < 10000; i++ {
            fmt.Printf("Hello,Go.This is %d\n", i)
        }
    }()
    go func() {
        defer wg.Done()
        for i := 0; i < 10000; i++ {
            fmt.Printf("Hello, world.This is %d\n", i)
        }
    }()
    wg.Wait()
}

sync.WaitGroup是一个计数的信号量，使main函数所在主线程等待两个goroutine执行完成后再结束，否则两个goroutine还在运行时，主线程已经结束。

sync.WaitGroup使用非常简单，使用Add方法设设置计数器为2，每一个goroutine的函数执行完后，调用Done方法减1。Wait方法表示如果计数器大于0，就会阻塞，main函数会一直等待2个goroutine完成再结束。


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