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POjava concurrency - interrupt a DeadLook thread
 

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  1. POjava concurrency - interrupt a DeadLook thread
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    <p> I'm trying to learn the basics of java concurrency, I start with oracle java tutorial until <a href="http://docs.oracle.com/javase/tutorial/essential/concurrency/deadlock.html" rel="nofollow">http://docs.oracle.com/javase/tutorial/essential/concurrency/deadlock.html</a>, I just add some line to the code example,but when I run the code, the main method never return. I know that both of alphonseThread and gastonThread are deadlocked by each ether, but why can't interrupt them from the main Thread? <pre><code>public class DeadLock { static class Freind { private final String name; public Freind(String name_) { this.name = name_; } public String getName() { return this.name; } public synchronized void bow(Freind bower) throws InterruptedException { System.out.format("%s : %s " + "has bowed to me!%n", this.name, bower.getName()); Thread.sleep(2000); bower.bowBack(this); } public synchronized void bowBack(Freind bower) { System.out.format("%s : %s " + "has bowed back to me!%n", this.name, bower.getName()); } } @SuppressWarnings("SleepWhileInLoop") public static void main(String[] args) throws InterruptedException { // wait for 4 seconds before send a interuption signal int patient = 4000; int waitingUnit = 1000; long start; final Freind alphonse = new Freind("Alphonse"); final Freind gaston = new Freind("Gaston"); // the first thread Thread alphonseThread = new Thread(new Runnable() { @Override public void run() { try { alphonse.bow(gaston); } catch (InterruptedException ex) { System.out.println("Alphnso have been killed"); } } }); // the second thread Thread gastonThread = new Thread(new Runnable() { @Override public void run() { try { gaston.bow(alphonse); } catch (InterruptedException ex) { System.out.println("Gaston have been killed "); } } }); // start the tow threads start = System.currentTimeMillis(); alphonseThread.start(); gastonThread.start(); while (alphonseThread.isAlive() || gastonThread.isAlive()) { if (((System.currentTimeMillis() - start) &lt; patient) &amp;&amp; (alphonseThread.isAlive() || gastonThread.isAlive())) { System.out.println(System.currentTimeMillis() - start); System.out.println("still waiting !!"); Thread.sleep(waitingUnit); } else { if (alphonseThread.isAlive()) { alphonseThread.interrupt(); alphonseThread.join(); } if (gastonThread.isAlive()) { gastonThread.interrupt(); gastonThread.join(); } } } System.out.println("finnaly I kill all of them"); } } </code></pre>
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