import java.util.concurrent.Semaphore;
public class Mutex ...{
private Semaphore s = new Semaphore(1);
public void acquire() throws InterruptedException ...{ s.acquire();
} public void release()...{ s.release(); } public boolean attempt(int ms) throws InterruptedException ...{ return s.tryAcquire(ms); }
}public class TestMutex ...{ public static void main(String[] args) throws InterruptedException...{ Mutex mutex=new Mutex(); mutex.acquire(); mutex.release(); mutex.release(); new MyThread(mutex).start(); new MyThread(mutex).start(); }}class MyThread extends Thread...{ private Mutex mutex; public MyThread(Mutex mutex) ...{ this.mutex=mutex; } public void run()...{ try ...{ mutex.acquire(); } catch (InterruptedException e1) ...{ throw new RuntimeException(e1); } for(int i=0;i<10;i++)...{ System.out.print(i); if(i%3==0)...{ try ...{ Thread.sleep(100); } catch (InterruptedException e) ...{ e.printStackTrace(); } } } mutex.release(); }} 该程序的输出如下：
00123123456456789789
从而证实了我的猜测。
【责编:Peng】
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2007-6-19
