/* This program generates an non-fatal internal JIT error on JDK 1.1.6! 
 * Sun was notified 8/20/99 so don't bother reporting it.
 This error has disappeared in 1.1.8 and 1.3
 */
/** 	
	Test Timing Jitter
	
 * @author Phil Burk and Nick Didkovsky
 */
/*
 * (C) 1997 Phil Burk and Nick Didkovsky, All Rights Reserved
 * JMSL is based upon HMSL (C) Phil Burk, Larry Polansky and David Rosenboom.
 */

package jmsltestsuite;
import java.awt.Frame;
import java.awt.event.WindowAdapter;
import java.awt.event.WindowEvent;

public class TestJitter {
	static final int NUM_LOOPS = 20;
	public static void main(String args[]) {

		Frame f = new Frame("TestJitter");
		f.addWindowListener(new WindowAdapter() {
			public void windowClosing(WindowEvent e) {
				System.exit(0);
			}
		});
		f.setSize(500, 100);
		f.setVisible(true);

		System.out.println("/* This program generates an non-fatal internal JIT error on JDK 1.1.6! ");
		System.out.println(" * Sun was notified 8/20/99 so don't bother reporting it.");
		System.out.println(" This error has disappeared in 1.1.8 and 1.3");

		long[] times = new long[NUM_LOOPS];
		long[] curTimes = new long[NUM_LOOPS];
		long lastTime, nextTime, currentTime, sleepFor;

		Thread.currentThread().setPriority(Thread.MAX_PRIORITY);

		lastTime = System.currentTimeMillis();
		for (int i = 0; i < NUM_LOOPS; i++) {
			nextTime = lastTime + 1000;
			while (true) {
				currentTime = System.currentTimeMillis();
				sleepFor = nextTime - currentTime;
				if (sleepFor <= 0)
					break;
				try {
					Thread.sleep(sleepFor);
				} catch (InterruptedException e) {
					System.err.println("Err = " + e);
				}
			}

			lastTime = nextTime;
			times[i] = System.currentTimeMillis();
			curTimes[i] = currentTime;
		}

		for (int i = 1; i < NUM_LOOPS; i++) {
			System.out.println("diff = " + (times[i] - times[i - 1]) + "cur diff = " + (curTimes[i] - curTimes[i - 1]));
		}

	}

}