Go语言并发同步初体验

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示例代码

package main

import (
	"fmt"
	"sync"
)

func sendMsg(msg_ch chan string, wg *sync.WaitGroup)  {
	fmt.Println("sendMsg start")
	msg_ch <- "hello 1" //向通道中写数据
	fmt.Println("sendMsg end")
	wg.Done()
}

func recvMsg(msg_ch chan string, wg *sync.WaitGroup)  {
	fmt.Println("recvMsg start")
	msg := <- msg_ch //阻塞等待通道数据可读
	fmt.Println("msg:", msg)
	fmt.Println("recvMsg end")
	wg.Done()
}

func main() {
	fmt.Println("00")
	wg := sync.WaitGroup{}
	wg.Add(2)
	msg_ch := make(chan string) //通过channel来通信
	go sendMsg(msg_ch, &wg) //启动roroutine并发执行
	go recvMsg(msg_ch, &wg) //启动roroutine并发执行
	fmt.Println("11")
	wg.Wait() //等待全部goroutine结束
	fmt.Println("22")
}

运行结果

00
11
recvMsg start
sendMsg start
sendMsg end
msg: hello 1
recvMsg end
22