JAVA閉鎖

壹頁書發表於2014-05-19
Java
JAVA併發程式設計實踐 79頁 閉鎖

設定執行緒的集合點

  1. import java.util.*;
  2. import java.util.concurrent.*;

  4. public class TestHarness{
  5.     public long timeTasks(int nThreads,final Runnable task) throws Exception
  6.     {
  7.         final CountDownLatch startGate=new CountDownLatch(1);
  8.         final CountDownLatch endGate=new CountDownLatch(nThreads);

  10.         for(int i=0;i<nThreads;i++)
  11.         {
  12.             Thread t=new Thread(new Runnable(){
  13.                 public void run()
  14.                 {
  15.                     try{
  16.                         startGate.await();
  17.                         task.run();
  18.                     }
  19.                     catch(Exception ex)
  20.                     {}
  21.                     finally{
  22.                         endGate.countDown();
  23.                     }
  24.                 }
  25.             });
  26.             t.start();
  27.         }

  29.         long start=System.nanoTime();
  30.         startGate.countDown();
  31.         endGate.await();
  32.         long end=System.nanoTime();
  33.         return end-start;
  34.     }

  36.     public static void main(String[] args) throws Exception
  37.     {
  38.         TestHarness t=new TestHarness();
  39.         t.timeTasks(2,new Runnable(){
  40.             public void run(){
  41.                 System.out.println(new Date());
  42.             }
  43.         });
  44.     }
  45. }

來自 “ ITPUB部落格 ” ，連結：http://blog.itpub.net/29254281/viewspace-1164720/，如需轉載，請註明出處，否則將追究法律責任。

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