Re: ABCL Threads

Hi everybody.

I made quite a bit of progress with THREADS in ABCL.  I had some snags, but
I think I got the hang of it (having written a lot of Java before the year
2000 and having taught it, helped).

I have a question about REGISTER-JAVA-EXCEPTION.  Two things.


   1. I read (mostly) the - 20 y.o. - thread at
   https://sourceforge.net/p/armedbear-j/mailman/armedbear-j-devel/thread/Pine.LNX.4.60.0510301322110.5998%40csusza.math.bme.hu/
   and I think I understand how to proceed.
   2. The REGISTER-JAVA-EXCEPTION doc string seems inconsistent with the
   above thread: "Registers the Java Throwable named by the *symbol*
   EXCEPTION-NAME as the condition designated by CONDITION-SYMBOL.  Returns T
   if successful, NIL if not." Symbol does not seem right.


I need to register java.util.concurrent.TimeoutException for my needs (and
your :) ), am I correct to go ahead and do

(define-condition timeout-exception (java-exception) ())
(java:register-java-exception "java.util.concurrent.TimeoutException"
'timeout-exception)

?

After that I will have other questions.

Thanks.

Marco



On Mon, Aug 10, 2026 at 6:29 PM Marco Antoniotti <[email protected]>
wrote:

> Thanks Dave, but I am on a different quest 🥹
>
> Having said that, what is the interaction between threads (read: the
> function running in a thread) and special variables?  It appears that they
> become thread local, is that so?  The documentation is very sparse.
>
> Thanks
>
> MA
>
> On Wed, Aug 5, 2026 at 7:13 PM David Cooper <[email protected]>
> wrote:
>
>>
>> Hi Marco,
>>
>> I don't have experience specifically with threads on abcl yet, but
>> regarding abcl in general, I took on maintenance of the
>> gitlab.common-lisp.net/cl-docker-images/
>> <http://gitlab.common-lisp.net/cl-docker-images/abcl/> container image
>> builds and recently got the abcl/ pipelines running green.  So any feedback
>> on those built docker container images (from Marco or anyone on this list)
>> would be welcomed.
>>
>> Also I just joined #abcl on libera.chat myself, I'm not sure your handle
>> on there to know whether you're one of the ~8 apparent members in that
>> channel. Anyway, that is a place where you and I (and anyone else
>> interestedd) could brainstorm any ideas or share any quirks regarding those
>> abcl docker images, maybe before they need to get promoted to Issues or MRs
>> in the project.
>>
>> Of course we can also discuss threads in there. I would hope bt2 would
>> have most needs covered - diving into Java internals sounds scary, to me at
>> least.
>>
>>
>> Thanks,
>>
>> Dave Cooper
>>
>>
>>
>>
>>
>> From: Marco Antoniotti <[email protected]>
>> To: "Rudi Schlatte"<[email protected]>
>> Cc: <[email protected]>
>> Date: Wed, 05 Aug 2026 05:20:06 -0400
>> Subject: Re: ABCL Threads
>>
>> Thanks
>>
>> Yep, I gathered that much.  I also saw a note in the documentation saying
>> that you can use JSS to use java.util.concurrent.  Can you point me to some
>> examples for that?
>>
>> Thanks
>>
>> Marco
>>
>> On Wed, Aug 5, 2026 at 11:44 AM Rudi Schlatte <[email protected]> wrote:
>>
>>
>>
>> --
>> Marco Antoniotti, Professor, Director         tel. +39 - 02 64 48 79 01
>>
>>
>>
>> > On 5 Aug 2026, at 09:57, Marco Antoniotti <[email protected]>
>> wrote:
>> >
>> > Hi
>> >
>> > It has been too long since I dabbled in Java, but I am working on some
>> threading code for ABCL.
>> >
>> > What would be a good implementation for BARRIERs in ABCL?
>>
>> Hi, if I don’t misunderstand the question, a barrier can be implemented
>> using the Java class java.util.concurrent.CountDownLatch.
>>
>> (I’m not on irc these days except dropping in for a few minutes every
>> other month..)
>>
>> Best,
>>
>> Rudi
>>
>>
>>
>>
>
> --
> Marco Antoniotti
>


-- 
Marco Antoniotti