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 mainimport ("fmt""sync""time")type TimeoutReadWriteLock struct {musync.RWMutexcond*sync.Condtimeout 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。