下面由golang教程欄目給大家介紹關(guān)于golang讀寫鎖，希望對需要的朋友有所幫助！

golang讀寫鎖，其特征在于

• 讀鎖：可以同時(shí)進(jìn)行多個(gè)協(xié)程讀操作，不允許寫操作

• 寫鎖：只允許同時(shí)有一個(gè)協(xié)程進(jìn)行寫操作，不允許其他寫操作和讀操作

讀寫鎖共有四個(gè)方法

• RLock：獲取讀鎖

• RUnLock：釋放讀鎖

• Lock：獲取寫鎖

• UnLock：釋放寫鎖

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 startn", id)     defer fmt.Printf("Read Coroutine: %d endn", id)     gRWLock.RLock()     fmt.Printf("gVar %dn", gVar)     time.Sleep(time.Second)     gRWLock.RUnlock()      wg.Done()  }  func Write(id int, wg *sync.WaitGroup) {     fmt.Printf("Write Coroutine: %d startn", id)     defer fmt.Printf("Write Coroutine: %d endn", id)     gRWLock.Lock()     gVar = gVar + 100     fmt.Printf("gVar %dn", gVar)     time.Sleep(time.Second)     gRWLock.Unlock()     wg.Done()  }