【并发编程】AQS学习

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一个简单的示例：

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1. package net.jcip.examples;
3. import java.util.concurrent.locks.*;
5. import net.jcip.annotations.*;
7. /**
8.  * OneShotLatch
9.  * <p/>
10.  * Binary latch using AbstractQueuedSynchronizer
11.  *
12.  * @author Brian Goetz and Tim Peierls
13.  */
14. @ThreadSafe
15. public class OneShotLatch {
16.     private final Sync sync = new Sync(); //基于委托的方式
18.     public void signal() {
19.         sync.releaseShared(0); ////会调用 tryAcquireShared
20.     }
22.     public void await() throws InterruptedException {
23.         sync.acquireSharedInterruptibly(0); //会调用 tryAcquireShared
24.     }
26.     private class Sync extends AbstractQueuedSynchronizer { //内部私有类
27.         protected int tryAcquireShared(int ignored) {
28.             // Succeed if latch is open (state == 1), else fail
29.             return (getState() == 1) ? 1 : -1;
30.         }
32.         protected boolean tryReleaseShared(int ignored) {
33.             setState(1); // Latch is now open
34.             return true; // Other threads may now be able to acquire
36.         }
37.     }
38. }

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来自为知笔记(Wiz)

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