golang锁

package main

import (
	"runtime"
	"sync"
	"sync/atomic"
	"time"
)

var (
	mutex sync.RWMutex
	mx sync.Mutex
	total = int64(0)
)

//读多写少用读写锁,写多读少用互斥锁
//原子函数atomic能够以很底层的加锁机制来同步访问整形变量和指针
func add(){
	for a:=0;a<2 ;a++  {
		atomic.AddInt64(&total, 1)
		//atomic.LoadInt64(&total)
		//atomic.StoreInt64(&total, 3)
		//当前goroutine从线程退出，并放回队列
		runtime.Gosched()
	}
}
func main(){
	
	go add()
	go add()
	time.Sleep(1*time.Second)
}