Created
October 12, 2012 13:12
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Semaphore hold the thread
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package com.zavakid.concurrent; | |
import java.util.concurrent.Semaphore; | |
import org.junit.Test; | |
/** | |
* @author Zava 2012-10-12 下午1:06:15 | |
* @version 1.0 | |
*/ | |
public class SemaphoreTest { | |
private final Semaphore sempahore = new Semaphore(5); | |
@Test | |
public void test() throws InterruptedException { | |
Thread thread1 = new Thread(new Runnable() { | |
@Override | |
public void run() { | |
try { | |
System.out.println("thread1 started acquire 4 "); | |
sempahore.acquire(4); | |
} catch (InterruptedException e) { | |
e.printStackTrace(); | |
} | |
System.out.println("thread1 has acquired 4, done..."); | |
} | |
}); | |
thread1.start(); | |
thread1.join(); | |
Thread thread2 = new Thread(new Runnable() { | |
@Override | |
public void run() { | |
try { | |
System.out.println("thread2 started acquire 1"); | |
sempahore.acquire(1); | |
} catch (InterruptedException e) { | |
e.printStackTrace(); | |
} | |
System.out.println("thread2 has acquired 1, done..."); | |
} | |
}); | |
thread2.start(); | |
thread2.join(); | |
Thread thread3 = new Thread(new Runnable() { | |
@Override | |
public void run() { | |
try { | |
System.out.println("thread3 started acquire 2"); | |
sempahore.acquire(2); | |
} catch (InterruptedException e) { | |
e.printStackTrace(); | |
} | |
System.out.println("thread3 has acquired 2, done..."); | |
} | |
}, "thread-3"); | |
thread3.start(); | |
System.out.println("sleep 1s"); | |
Thread.sleep(1000); | |
System.out.println("wake up now"); | |
Thread thread4 = new Thread(new Runnable() { | |
@Override | |
public void run() { | |
try { | |
System.out.println("thread4 started acquire 1"); | |
sempahore.acquire(1); | |
} catch (InterruptedException e) { | |
e.printStackTrace(); | |
} | |
System.out.println("thread4 has acquired 1, done..."); | |
} | |
}, "thread-4"); | |
thread4.start(); | |
System.out.println("sleep 1s"); | |
Thread.sleep(1000); | |
System.out.println("wake up now"); | |
Thread thread5 = new Thread(new Runnable() { | |
@Override | |
public void run() { | |
System.out.println("thread5 started release 1"); | |
sempahore.release(1); | |
System.out.println("thread5 has release 1, done..."); | |
} | |
}, "thread-5"); | |
thread5.start(); | |
thread3.join(); | |
thread4.join(); | |
System.out.println("all done, but never reach here..."); | |
} | |
} |
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this code is needed @ http://www.zavakid.com/207