关于golang读写锁

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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 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()  }