package main

import (

    "fmt"

    "runtime"

    "time"

)

func test() {

    defer fmt.Println("end")

    //return           //终止此函数

    runtime.Goexit() //终止协程

    fmt.Println("ccccc")

}

//主协程退出，子协程也退出

func main() {

    //指定运算核数

    n := runtime.GOMAXPROCS()

    go func() {

        for {

            fmt.Println("sum")

            time.Sleep(time.Second)

        }

    }()

    go func() {

        fmt.Println("aaaaa")

        test()

        fmt.Println("bbbbb")

    }()

    for i := ; i < ; i++ {

        fmt.Println("main")

        time.Sleep(time.Second)

    }

}