package main

import (
	"fmt"
	"runtime"
	"sync"
)

var wgGroup sync.WaitGroup

func main() {
	runtime.GOMAXPROCS(2) //指定P的数量
	wgGroup.Add(2)
	go a()
	go b()
	wgGroup.Wait()
}

func a() {
	defer wgGroup.Done()
	for i := 0; i < 10; i++ {
		fmt.Printf("A:%v\n", i)
	}
}

func b() {
	defer wgGroup.Done()
	for i := 0; i < 10; i++ {
		fmt.Printf("B:%v\n", i)
	}
}