RE: Thread waiting on a data queue ... doesn't respond to interrupt()??

["Dan Kimmel" <dkimmel@xxxxxxxxxxxxxxx>]

You could have a race condition on a multiprocessor machine. The
dataqueue monitorThread is doing something in processEntry() when the
interrupting thread hits the join. 

-----Original Message-----
From: java400-l-bounces@xxxxxxxxxxxx
[mailto:java400-l-bounces@xxxxxxxxxxxx] On Behalf Of David Gibbs
Sent: Thursday, May 07, 2009 11:20 AM
To: Java Programming on and around the iSeries / AS400
Subject: Thread waiting on a data queue ... doesn't respond to
interrupt()??

Folks:

Has anyone ever seen something like this?

I've got a thread that's listening on a data queue ... timeout value is
set to -1 (wait forever).

The thread is sent an interrupt message ... which should throw an
InterruptedException that I catch ... but sometimes it doesn't.

The code that is reading the data queue looks like this:

----------
int waitTime = -1;

try {
    while(true) {
	try {
	    DataQueueEntry entry = changeQueue.read(waitTime);
	    if (entry != null) {
	    	processEntry(entry);
	    }
	} catch (AS400SecurityException e) {
	    e.printStackTrace();
	} catch (ErrorCompletingRequestException e) {
	    e.printStackTrace();
	} catch (IOException e) {
	    e.printStackTrace();
	} catch (IllegalObjectTypeException e) {
	    e.printStackTrace();
	} catch (ObjectDoesNotExistException e) {
	    e.printStackTrace();
	}
    }
} catch (InterruptedException e) {
    System.out.println("Thread was interrupted, exit"); }
----------

The method that is trying to interrupt the thread is something like
this:

----------
monitorThread.interrupt();
try {
    monitorThread.join();
} catch (InterruptedException e) {
    logException(e);
}
----------

But it the join() method never seems to return.  

I'm not 100% sure, but I think this has only been seen when the program
is running on the iSeries ... not on a PC.

Any thoughts?

Thanks!

david

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