读写锁是什么，golang读写锁学习

golang读写锁，其特征在于

• 读锁：可以同时进行多个协程读操作，不允许写操作

• 写锁：只允许同时有一个协程进行写操作，不允许其他写操作和读操作

读写锁共有四个方法

• RLock：获取读锁

• RUnLock：释放读锁

• Lock：获取写锁

• UnLock：释放写锁

使用例子如下

package main

import (    "fmt"
    "sync"
    "time")var gRWLock *sync.RWMutexvar gVar intfunc init() {

    gRWLock = new(sync.RWMutex)
    gVar = 1}


func main() {
        var wg sync.WaitGroup
    go Read(1, &
    wg)
    wg.Add(1)
    go Write(1, &
    wg)
    wg.Add(1)
    go Read(2, &
    wg)
    wg.Add(1)
    go Read(3, &
wg)
    wg.Add(1)

    wg.Wait()
}


func Read(id int, wg *sync.WaitGroup) {

    fmt.Printf("Read Coroutine: %d start\n", id)
    defer fmt.Printf("Read Coroutine: %d end\n", id)
    gRWLock.RLock()
    fmt.Printf("gVar %d\n", gVar)
    time.Sleep(time.Second)
    gRWLock.RUnlock()

    wg.Done()

}


func Write(id int, wg *sync.WaitGroup) {

    fmt.Printf("Write Coroutine: %d start\n", id)
    defer fmt.Printf("Write Coroutine: %d end\n", id)
    gRWLock.Lock()
    gVar = gVar + 100
    fmt.Printf("gVar %d\n", gVar)
    time.Sleep(time.Second)
    gRWLock.Unlock()
    wg.Done()

}