golang sync.RWMutex

sync.RWMutex

package main



import (

    "fmt"

    "runtime"

    "sync"

)



func clickWithMutex(total *int, m *sync.RWMutex, ch chan int) {

    for i := 0; i < 1000; i++ {

        m.Lock()

        *total += 1

        m.Unlock()

        //这里是写 下面是读，外层还有线程的竞争

        if i == 500 {

            m.RLock()

            fmt.Println(*total)

            m.RUnlock()

        }

    }

    ch <- 1

}



func main() {



    runtime.GOMAXPROCS(4) //使用多个处理器，不然都是顺序执行。



    m := new(sync.RWMutex)

    count := 0



    ch := make(chan int, 10) //保证输出时count完了



    for i := 0; i < 10; i++ {

        go clickWithMutex(&count, m, ch)

    }



    for i := 0; i < 10; i++ {

        <-ch

    }



    fmt.Printf("count:%d\n", count)

}