本篇文章小编将带大家一起学习一下go语言中的并发控制中的WaitGroup计数信号量 ，并附上用例代码，具有一定的参考价值，感兴趣的朋友快来学习一下吧！
WaitGroup是一个计数信号量，可以用来记录并维护运行的goroutine,如果WaitGroup的值大于0，Wait方法就会阻塞
调用Done方法来减少WaitGroup的值，并最终释放main函数
package mainimport( "fmt" "runtime" "sync")func main(){ //只分配一个逻辑处理器给调度器使用 runtime.GOMAXPROCS(1) //wg用来使main goroutine等待子goroutine结束 var wg sync.WaitGroup //等待两个子goroutine结束 wg.Add(2) fmt.Println("开启goroutine") go func(){ defer wg.Done() //循环显示三遍字母表 for count:=0;count<3;count++{ //循环显示字母表 for char:='a';char<'a'+26;char++{ fmt.Printf("%c ",char) } } }() go func(){ defer wg.Done() //循环显示三遍字母表 for count:=0;count<3;count++{ //循环显示字母表 for char:='A';char<'A'+26;char++{ fmt.Printf("%c ",char) } } }() //main goroutine等待子goroutine结束 wg.Wait() fmt.Println("\ngoroutine结束")}想了解更多go语言教程，快去关注PHP中文网的go视频教程吧！
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