Name: stC104175 Date: 06/06/2000


java version "1.2.2"
Classic VM (build 1.2.2-L, native threads,
javacomp)

the Thread.sleep() method does not sleep after an interrupt () call to the
thread.

  To demonstrated the problem, the following program read a delay from the
keybord, set the delay for the sleep and calls interrupt() on the thread.

This works for 1 or 2 calls to the setDelay(int) method, and no more after : the
sleep() does not sleep anymore.

note : the problem occurs with and without the Imprise JIT.

///////////////////////////////////////////
// This program try to change a sleeping delay for a thread
// and interrupt the thread to take the new delay immediatly.
// After 2 changes of the delay,
// the Thread.sleep() DOES NOT SLEEP AT ALL !!!!
///////////////////////////////////////////

import java.io.BufferedReader;
import java.io.InputStreamReader;
import java.util.Date;

public class TestThread implements Runnable {

// The working thread
private Thread me = null;

// sleep delay in seconds
private int delay;

public TestThread (int delay) {
this.delay = delay;
}

/**
* set the delay and try to interrupt the thread
* in order to take the new delay immediatly
*/
public void setDelay (int delay) {
this.delay = delay;
if (me != null) {
me.interrupt ();
}
}

public void start () {
if (me == null) {
me = new Thread (this);
me.start ();
}
}

public void stop () {
if (me != null) {
Thread current = me;
me = null;
current.interrupt ();
}
}

public void run () {
while (me == Thread.currentThread()) {
try {
Thread.sleep (delay * 1000);
} catch (InterruptedException e) {
// nothing
}
System.out.println ("do something. date:" + new Date().toString());
}
}

public static void main (String args[]) {
int delay = 10;
TestThread testThread = new TestThread (10);
testThread.start ();
BufferedReader bufferedReader = new BufferedReader(new
InputStreamReader(System.in));
while (true) {
String delayString;
System.out.println ("enter a delay:");
try {
delayString = bufferedReader.readLine ();
} catch (java.io.IOException ioe) { break; }
delay = Integer.parseInt(delayString);
testThread.setDelay (delay);
}
}
}
(Review ID: 105172)
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