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From: Nate Williams <nate@yogotech.com>
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Date: Wed, 14 Aug 2002 10:35:15 -0600
To: Huang wen hui <hwh@ns.gddsn.org.cn>
Cc: "Bill Huey (Hui)" <billh@gnuppy.monkey.org>,
	java <java@FreeBSD.ORG>
Subject: Re: Hotspot vm is extremely slower  than nojit vm on current ?
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> >>Mostly hotspot vm is stable and fast, but I got problem with Thread.sleep.
> >>Look at the following simple program, on current hotspot vm is extreamly
> >>slow.

This is probably unrelated, but you should note that you need to use
synchronization on bQuit in order for it to be safely set.  Otherwise,
it is OK for the Timer thread to cache it's value (set to FALSE) and
continue to use that value, so it may not pick up the new setting when
you want it to.

public class Timer extends Thread {
  private static ThreadGroup tGroup = new ThreadGroup("Timer");
  // Number of seconds in each timer cycle
  int m_cycle;

  private Object quitLock = new Object();
  private boolean bQuit = false;

  public Timer(int cycle) {
    super(tGroup,"TimerThread");
    m_cycle = cycle;
  }

  public void run() {
    this.setName("TimerThread");
    // Loop until stopped
    while (!done()) {
      try {
        // Sleep for the clock cycle
        sleep(m_cycle * 1000);
      } catch (InterruptedException ex) {
        // Ignored
      }

      // Fire a TimerEvent
      if (m_timerListener != null) {
        m_timerListener.TimerEvent(m_object);
    }
  }

  public void quit() {
    synchronized (quitLock) {
       bQuit = true;
    }
  }

  private boolean done() {
    synchronized (quitLock) {
       return (bQuit);
  }
}


Nate

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