Go语言之gorouline

goroutine是什么

goroutine是go并发设计的核心，goroutine说到底其实就是携程，只需要在函数调用语句前添加go关键字，就可创建并发执行单元，开发人员无需了解任何执行细节，调度器会自动将其安排到合适的系统线程上执行。

入门

package main

import (
    "fmt"
    "time"
)
func newTask(){
    fmt.Println("this is a newTask")
    time.Sleep(time.Second)
}
func main(){

    go newTask() //新建一个携程

    for {
        fmt.Println("this is a main goroutine")
        time.Sleep(time.Second)
    }
}

#结果
this is a main goroutine
this is a newTask
this is a main goroutine
this is a main goroutine

主协程退出，子协程一同退出

package main

import (
    "fmt"
    "time"
)

//主协程退出了，其它子协程也要跟着退出
func main(){
    go func(){
        i := 0
        for {
            i++
            fmt.Println("子协程 i = ", i)
            time.Sleep(time.Second)

            if i == 2 {
                break
            }
        }
    }()
    i := 0
    for {
        i++
        fmt.Println("main i = " , i)
        time.Sleep(time.Second)

        if i == 2 {
            break
        }
    }
}
#结果
main i =  1
子协程 i =  1
子协程 i =  2
main i =  2