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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 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() }
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