[Swift-devel] "Timer was cancelled" error on Beagle on Swift script termination

[Mihael Hategan]

Ok. So I'm gonna then go with timer thread killed during shutdown.

Here's the relevant code in Timer.java:
public void run() {
        try {
            mainLoop();
        } finally {
            // Someone killed this Thread, behave as if Timer cancelled
            synchronized(queue) {
                newTasksMayBeScheduled = false;
...
private void sched(TimerTask task, long time, long period) { 
//this is scheduleImpl in the IBM jvm
        if (time < 0)
            throw new IllegalArgumentException("Illegal execution
time.");

        synchronized(queue) {
            if (!thread.newTasksMayBeScheduled)
                throw new IllegalStateException("Timer already
cancelled.");
...

I guess the solution here is to ignore this error during shutdown and
simply not have timeouts.

Mihael

On Mon, 2011-03-28 at 10:05 -0500, Michael Wilde wrote:
> This was run on an 0.92 release modified to support Beagle. Code was build from ~wilde/swift/src/0.92
> 
> We can/should try with plain 0.92,
> on both Beagle and vanilla linux
> building from both Beagle Java and Sun Java
> 
> Those are the variables I can think of to get closer to the root cause.
> 
> - Mike
> 
> ----- Original Message -----
> > Hi Mihael, Mike,
> > 
> > I think Mike had built a local Swift with pbs+coaster capabilities for
> > beagle. I am not sure if a clean install from repo has (if yes, I do
> > not know which rev) these capabilities.
> > 
> > Ketan
> > 
> > 
> > On Mon, Mar 28, 2011 at 2:04 AM, Mihael Hategan < hategan at mcs.anl.gov
> > > wrote:
> > 
> > 
> > The IBM implementation seems to do pretty much the same thing as the
> > Sun
> > one. Which is that they never call .cancel() on a timer.
> > 
> > So I don't understand what's happening here. I don't see any piece of
> > code that cancels that timer. Are you all using the same swift
> > installation? Can you try a clean install?
> > 
> > Mihael
> > 
> > 
> > 
> > 
> > On Sun, 2011-03-27 at 20:12 -0500, Ketan Maheshwari wrote:
> > >
> > >
> > > On Sun, Mar 27, 2011 at 4:23 PM, Mihael Hategan <
> > > hategan at mcs.anl.gov >
> > > wrote:
> > > Actually I'm not so sure any more.
> > >
> > > My java Timer does not seem to have a scheduleImpl method.
> > > What version
> > > of java is this?
> > >
> > > On beagle it is java 1.6.0:
> > >
> > > [ketan at login2:~]$ java -version
> > > java version "1.6.0"
> > > Java(TM) SE Runtime Environment (build pxa6460sr9-20101125_01(SR9))
> > > IBM J9 VM (build 2.4, JRE 1.6.0 IBM J9 2.4 Linux amd64-64
> > > jvmxa6460sr9-20101124_69295 (JIT enabled, AOT enabled)
> > > J9VM - 20101124_069295
> > > JIT - r9_20101028_17488ifx2
> > > GC - 20101027_AA)
> > > JCL - 20101119_01
> > >
> > > ===
> > >
> > > --Ketan
> > >
>