在Go语言中,没有内置的读写锁支持超时功能。但是,你可以使用time.After
函数和select
语句来实现一个带有超时的读写锁。下面是一个简单的示例:
package main import ( "fmt" "sync" "time" ) type TimeoutReadWriteLock struct { mu sync.RWMutex cond *sync.Cond timeout time.Duration } func NewTimeoutReadWriteLock(timeout time.Duration) *TimeoutReadWriteLock { return &TimeoutReadWriteLock{ cond: sync.NewCond(&sync.Mutex{}), timeout: timeout, } } func (l *TimeoutReadWriteLock) ReadLock() { l.mu.RLock() defer l.mu.RUnlock() select { case <-time.After(l.timeout): return fmt.Errorf("read lock timeout") default: return nil } } func (l *TimeoutReadWriteLock) ReadUnlock() { l.mu.RUnlock() } func (l *TimeoutReadWriteLock) WriteLock() { l.mu.Lock() defer l.mu.Unlock() select { case <-time.After(l.timeout): return fmt.Errorf("write lock timeout") default: return nil } } func (l *TimeoutReadWriteLock) WriteUnlock() { l.mu.Unlock() } func main() { lock := NewTimeoutReadWriteLock(2 * time.Second) go func() { time.Sleep(1 * time.Second) lock.WriteLock() fmt.Println("Write lock acquired") time.Sleep(3 * time.Second) lock.WriteUnlock() fmt.Println("Write lock released") }() go func() { time.Sleep(500 * time.Millisecond) err := lock.ReadLock() if err != nil { fmt.Println("Read lock error:", err) } else { fmt.Println("Read lock acquired") time.Sleep(2 * time.Second) lock.ReadUnlock() fmt.Println("Read lock released") } }() time.Sleep(10 * time.Second) }
在这个示例中,我们创建了一个TimeoutReadWriteLock
结构体,它包含一个读写锁、一个条件变量和一个超时时间。ReadLock
和WriteLock
方法使用select
语句来检查是否已经超过了超时时间。如果超过了超时时间,它们将返回一个错误;否则,它们将继续执行读写锁操作。