go-go协程

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)
    }
}