Name: stC104175 Date: 08/23/2000


java version "1.2.2"
Classic VM (build JDK-1.2.2-W, native threads, symcjit)

When using Thread.sleep(), I have a delay problem using jdk 1.2
on a dual processor win 4.0 server nt machine (NetFinity).
I don't have this problem on a single processor machine.

I reproduced the problem with the following test code.

class tClock {
    public static void main(String[] args) {

        Thread t = new Sleeper();
                        
        t.start();

    }
}

class Sleeper extends Thread {
    public void run() {
try {
Timestamp currentDate = new Timestamp( System.currentTimeMillis() );
System.out.println("Starting at " + currentDate);

long timeToSleep = 1; //minutes
timeToSleep *= ((long)(60 * 1000));
System.out.println("Next time to wake up: (" + timeToSleep + "): "
+ new Timestamp( System.currentTimeMillis()
                               + timeToSleep ));
sleep(timeToSleep);

System.out.println("Sleeper woke up at: "
+ new Timestamp( System.currentTimeMillis() ));
yield();

timeToSleep = 60; //minutes
timeToSleep *= ((long)(60 * 1000));
System.out.println("Next time to wake up(" + timeToSleep + "): "
+ new Timestamp( System.currentTimeMillis() +
timeToSleep ));
sleep(timeToSleep);

System.out.println("Sleeper woke up at : "
+ new Timestamp( System.currentTimeMillis() ));
yield();

timeToSleep = 120; //minutes
timeToSleep *= ((long)(60 * 1000));
System.out.println("Next time to wake up(" + timeToSleep + "): "
+ new Timestamp( System.currentTimeMillis() +
timeToSleep ));
sleep(timeToSleep);

System.out.println("Sleeper woke up at : "
+ new Timestamp( System.currentTimeMillis() ));
yield();

timeToSleep = 180; //minutes
timeToSleep *= ((long)(60 * 1000));
System.out.println("Next time to wake up(" + timeToSleep + "): "
+ new Timestamp( System.currentTimeMillis() +
timeToSleep ));
sleep(timeToSleep);

System.out.println("Sleeper woke up at : "
+ new Timestamp( System.currentTimeMillis() ));
yield();
} catch (InterruptedException e) {
                System.out.println("sleeper interrupted (1): "
+ isInterrupted());
                System.out.println("sleeper interrupted");
}
System.out.println("sleeper interrupted (2): " + isInterrupted());
    }
}

The results are the following:

Starting at 2000-05-17 10:28:30.968
Next time to wake up(60000): 2000-05-17 10:29:31.031
Sleeper woke up at : 2000-05-17 10:29:31.031
Next time to wake up(3600000): 2000-05-17 11:29:31.031
Sleeper woke up at : 2000-05-17 11:30:47.031
Next time to wake up(7200000): 2000-05-17 13:30:47.031
Sleeper woke up at : 2000-05-17 13:39:32.046
Next time to wake up(10800000): 2000-05-17 16:39:32.046
Sleeper woke up at : 2000-05-17 16:52:18.046
sleeper interrupted (2): false
(Review ID: 106603)
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