golang 12. goroutine goexit

goroutine.go

package main

import (
	"fmt"
	"time"
)

//子goroutine
func newTask() {
	i := 0
	for {
		i++
		fmt.Printf("new Goroutine : i = %d\n", i)
		time.Sleep(1 * time.Second)
	}
}

//主goroutine
func main() {
	//创建一个go程 去执行newTask() 流程
	go newTask()

	fmt.Println("main goroutine exit")


	i := 0
	for {
		i++
		fmt.Printf("main goroutine: i = %d\n", i)
		time.Sleep(1 * time.Second)
	}

}

goexit.go

package main

import (
	"fmt"
	"time"
)

func main() {

	
		//用go创建承载一个形参为空，返回值为空的一个函数
		go func() {
			defer fmt.Println("A.defer")

			func() {
				defer fmt.Println("B.defer")
				//退出当前goroutine
				runtime.Goexit()
				fmt.Println("B")
			}()

			fmt.Println("A")
		}()

	go func(a int, b int) bool {
		fmt.Println("a = ", a, ", b = ", b)
		return true
	}(10, 20)

	//死循环
	for {
		time.Sleep(1 * time.Second)
	}

}
/*
a =  10 , b =  20
B.defer
A.defer
*/