golang sync/atomic替代互斥锁

下面是一个使用sync/atomic包实现的简单计数器的示例
package main

import (
"fmt"
"sync"
"sync/atomic"
)

func main() {
var counter int64
var wg sync.WaitGroup
for i := 0; i < 100; i++ {
wg.Add(1)
go func() {
defer wg.Done()
for j := 0; j < 1000; j++ {
atomic.AddInt64(&counter, 1)
}
}()
}
wg.Wait()
fmt.Println("Counter:", counter)
}