小编Art*_*san的帖子

我有一个代码片段：

type calculation struct{
    sum int
    mutex sync.Mutex
}

func dosomething(c *calculation , wg *sync.WaitGroup) {
    c.mutex.Lock()
    c.sum++
    c.mutex.Unlock()
    wg.Done()
}

func main() {
    t := time.Now()
    c := new(calculation)
    wg := new(sync.WaitGroup)
    for i:=0; i<10000000; i++{
        wg.Add(1)
        go dosomething(c, wg)
    }
    wg.Wait()
    fmt.Println(c.sum)
    fmt.Println(time.Since(t))
}

但我发现使用互斥指针也有效：

type calculation struct{
    sum int
    mutex *sync.Mutex
}

func dosomething(c *calculation , wg *sync.WaitGroup) {
    c.mutex.Lock()
    c.sum++
    c.mutex.Unlock()
    wg.Done()
}

func main() {
    t := time.Now()
    c := &calculation{0, new(sync.Mutex)}
    wg := new(sync.WaitGroup) …