multi-thread（十）CyclicBarrier

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Semaphore.acquire()：最多n个运行，与Executors.newFixedThreadPool( 2 )作用相似

CyclicBarrier.await(): 加到n才开始

CountDownLatch.await(): 减到0才开始

/** * CyclicBarrier.await(): Waits until all parties have invoked await on this barrier.  * @author timeriver.wang * @date Mar 10, 2014 10:43:52 AM */public class CyclicBarrierTest {public static void main(String[] args) {ExecutorService service = Executors.newCachedThreadPool();final  CyclicBarrier cb = new CyclicBarrier(3);for(int i=0;i<3;i++){Runnable runnable = new Runnable(){public void run(){try {Thread.sleep((long)(Math.random()*1000));System.out.println("线程" + Thread.currentThread().getName() + "即将到达集合地点1，当前已有" + (cb.getNumberWaiting()+1) + "个已经到达，" + (cb.getNumberWaiting()==2?"都到齐了，继续走啊":"正在等候"));cb.await();Thread.sleep((long)(Math.random()*10000));System.out.println("线程" + Thread.currentThread().getName() + "即将到达集合地点2，当前已有" + (cb.getNumberWaiting()+1) + "个已经到达，" + (cb.getNumberWaiting()==2?"都到齐了，继续走啊":"正在等候"));cb.await();} catch (Exception e) {e.printStackTrace();}}};service.execute(runnable);}service.shutdown();}}

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