golang学习笔记——协程

当主协程退出后子协程也会退出

package main

import (

"fmt"

"time"

)

func main() {

go func() {

i := 0

for {

i++

fmt.Println("son i = ", i)

time.Sleep(time.Second)

}

}()

for i := 0; i < 3; i++ {

fmt.Println("main i = ", i)

time.Sleep(time.Second)

if i == 2 {

break

}

}

}

runtime包

• runtime.Gosched() 让出当前执行权限

package main

import (

"fmt"

"runtime"

)

func main() {

//设置为单核运行

runtime.GOMAXPROCS(1)

go func() {

for i := 0; i < 5; i++ {

fmt.Println("task i = ", i)

}

}()

for i := 0; i < 2; i++ {

runtime.Gosched()

fmt.Println("main i = ", i)

}

}

• runtime.Goexit() 终止当前协程

package main

import (

"fmt"

"runtime"

)

func test() {

defer func() {

fmt.Println("dddddddddddddddd")

}()

// return //终止函数

runtime.Goexit() //终止当前协程

fmt.Println("ccccccccccccccccccc")

}

func main() {

go func() {

fmt.Println("aaaaaaaaaaaaaaaa")

test()

fmt.Println("bbbbbbbbbbbbbbb")

}()

for {

}

}

//********输出***********

aaaaaaaaaaaaaaaa

dddddddddddddddd

• runtime.GOMAXPROCS() 设置执行指令的cpu核数，返回上一次执行设置的cpu核数