如何将ReentrantReadWriteLock.readLock或ReentrantReadWriteLock.writeLock转换为我的类对象
如何将ReentrantReadWriteLock.readLock或ReentrantReadWriteLock.writeLock转换为我的类对象
提问于 2011-11-30 20:20:51
我写了一个包装器，但是我的问题是ReadLock()方法返回的是ReentrantReadWriteLock.WriteLock，所以我没有多余的getThreadReadLockCount afterwards.What我想要的是readLock()方法返回我，这样我就可以有多余的东西给count方法。有什么想法吗？
private final ThreadLocal readLocksHeldByThread;
private static class ReadCounts {
public int value = 0;
}
public CustomReentrantReadWriteLock() {
super(true);
readLocksHeldByThread = new ThreadLocal() {
@Override
public Object initialValue() {
return new ReadCounts();
}
};
}
@Override
public synchronized ReadLock readLock() {
final ReadCounts myReadLocks = (ReadCounts) readLocksHeldByThread.get();
++myReadLocks.value;
return super.readLock();
}
public synchronized int getThreadReadLockCount() {
final ReadCounts currentReadLocks = (ReadCounts) readLocksHeldByThread.get();
return currentReadLocks.value;
}回答 1
Stack Overflow用户
回答已采纳
发布于 2011-11-30 20:54:48
你的代码只计算线程请求读锁的次数，如果它在锁和释放之间被缓存，这将给出不同的结果：
Lock rl = var.readLock();
rl.lock();
try{
//...
}finally{
rl.unlock();
}vs
var.readLock().lock();
try{
//...
}finally{
var.readLock().unlock();
}将产生不同的结果
您可以像这样包装返回的锁
@Override public Lock readLock() {
final ReadCounts myReadLocks = (ReadCounts) readLocksHeldByThread.get();
return new Lock(){
Lock l = super.readLock();
public void lock(){
l.lock();
++myReadLocks.value;
}
public void lockInterruptibly() throws InterruptedException{
l.lockInterruptibly();
++myReadLocks.value;
}
public boolean tryLock(){
if(l.tryLock()){
++myReadLocks.value;
return true;
}else return false;
}
public boolean tryLock(long time, TimeUnit unit) throws InterruptedException{
if(l.tryLock(time,unit)){
++myReadLocks.value;
return true;
}else return false;
}
public void unlock(){
--myReadLocks.value;
l.unlock();
}
public Condition newCondition(){
return l.newCondition();
}
}
} 页面原文内容由Stack Overflow提供。腾讯云小微IT领域专用引擎提供翻译支持
原文链接：
https://stackoverflow.com/questions/8325864
复制相关文章
相似问题
腾讯云开发者
Copyright © 2013 - 2026 Tencent Cloud. All Rights Reserved. 腾讯云 版权所有
深圳市腾讯计算机系统有限公司 ICP备案/许可证号：粤B2-20090059 
粤公网安备44030502008569号
腾讯云计算（北京）有限责任公司 京ICP证150476号 | 京ICP备11018762号