go 协程

package main

import (
	"time"
	"fmt"
	"runtime"
)

func test()  {
	for i:=0;i<10;i++{
		time.Sleep(time.Microsecond *100)
		fmt.Print(i)
	}
	fmt.Println("--------")
}

func main()  {
	runtime.GOMAXPROCS(2) 
	go test()
	go test()

	time.Sleep(time.Second * 5)
	print(runtime.NumCPU()) // 获取电脑cpu数量
}

　　

结果

GOROOT=/usr/local/go #gosetup
GOPATH=/www/gopath #gosetup
/usr/local/go/bin/go build -i -o /private/var/folders/fc/4txmmczj6q92p6058h3w7t_80000gn/T/___go_build_main_go__2_ /www/go/learn/main.go #gosetup
/private/var/folders/fc/4txmmczj6q92p6058h3w7t_80000gn/T/___go_build_main_go__2_ #gosetup
00112233445566778899--------
--------
8
Process finished with exit code 0