标签:运行 art number await port catch ack join nts
关于等待状态的线程调用interrupt方法报异常:InterruptedException
当线程被阻塞,比如wait,join,sleep等,在调用interrupt方法,没有占用cpu运行的线程是不可能给自己的中断状态置位的,这就产生了InterruptedException异常.
一.CountDownLatch(允许一个或多个线程等待其它线程完成操作)
代码实例:
package com.thread.ccse; import java.util.concurrent.CountDownLatch; import java.util.concurrent.TimeUnit; /** * Created by IntelliJ IDEA. * User: 周强 * Description: * Date: 2017/8/9 * Time: 21:04 */ public class CountDownLatchTest { public static CountDownLatch c = new CountDownLatch(4); public static void main(String [] args) throws InterruptedException { Thread t =new Thread(new Runnable() { @Override public void run() { System.out.println(c.getCount()); //第1 c.countDown(); System.out.println(c.getCount());//第2 c.countDown(); try { Thread.sleep(3000); } catch (InterruptedException e) { e.printStackTrace(); } System.out.println(c.getCount());//第3 c.countDown(); System.out.println(c.getCount());//第4 } }); t.start(); c.await(2, TimeUnit.SECONDS); c.countDown(); System.out.println(c.getCount( ));//第5 } }
输出结果如下:
Connected to the target VM, address: ‘127.0.0.1:55816‘, transport: ‘socket‘ 4 第1 3 第2 1 第5 Disconnected from the target VM, address: ‘127.0.0.1:55816‘, transport: ‘socket‘ 1 第3 0 第4 Process finished with exit code 0
由于线程t沉睡时间大于CountDownLatch c的等待时间,所以线程t在主线证执行完毕后才结束的.
二:CyclicBarrier(指定线程数,必须在该线程数内的线程全部到达同步点,才继续往下执行)
示例代码:
package com.thread.ccse; import java.util.concurrent.BrokenBarrierException; import java.util.concurrent.CyclicBarrier; /** * Created by IntelliJ IDEA. * User: 周强 * Description: * Date: 2017/8/9 * Time: 21:30 */ public class CyclicBarrierTest { static Thread t = new Thread(new Runnable() { @Override public void run() { System.out.println("3"); } }); static Thread thread = null; public static CyclicBarrier c = new CyclicBarrier(2,t); static { thread = new Thread(new Runnable() { @Override public void run() { try { c.await(); System.out.println("1"); } catch (InterruptedException e) { e.printStackTrace(); } catch (BrokenBarrierException e) { e.printStackTrace(); } } }); } public static void main(String [] args){ thread.start(); try { c.await(); System.out.println("2"); } catch (InterruptedException e) { e.printStackTrace(); } catch (BrokenBarrierException e) { e.printStackTrace(); } } }
执行结果:
Disconnected from the target VM, address: ‘127.0.0.1:56157‘, transport: ‘socket‘ 3 2 1//其中,3 肯定是最先输出的,1 和 2 的输出顺序是不一定的 Process finished with exit code 0
CountDownLatch和CyclicBarrier的区别:
CountDownLatch计数器只能使用一次,而CyclicBarrier的计数器可以使用多次,因为CyclicBarrier可以使用reset方法重置计数器;
CyclicBarrier还提供其它方法,如getNumberWating方法可以获得CyclicBarrier阻塞的线程数,isBroken方法可以用来了解阻塞的线程是否被中断。
三:
待续
ccse(CountDownLatch,CycliBarrier,Semaplore,Exchanger)
标签:运行 art number await port catch ack join nts
原文地址:http://www.cnblogs.com/zqsky/p/7328013.html