You should take a look at some recent VM changes that Andreas has proposed:
 
http://discuss.squeakfoundation.org/cgi-bin/ezmlm-browse?list=vm-dev&cmd=showmsg&msgnum=749

I've switched over to this for wxSqueak, and it's working well.

.. Rob

Lethalman wrote:
> GObject is the base object fo rall Gtk objects, however i solved using
> setjmp/longjmp as wxSqueak do.
> 
> On 6/17/06, stéphane ducasse <ducasse at iam.unibe.ch> wrote:
> 
>> > (first sorry for my poor English)
>> No problem :L) mine is bad too :)
>> I read your blog :)
>>
>> > Hello,
>> > i'm trying to solve problems with GObject signals but everytime i
>> > get something not working as well.
>>
>> What is a GObject
>>
>> > Actually, i have a threaded gtk main loop. Since callbacks have
>> > return values, and also because i have to wait before the squeak
>> > side callback finish its work, i wait with something like a lock:
>> >
>> > while (callback->locked != 0);
>> >
>> > Now, Squeak process and the main loop are two different OS level
>> > threads. When a callback is called it's registered into a queue and
>> > a semaphore is signaled, Squeak then checks for callbacks and run
>> > them. In the while, the C callback idles until callback->locked is
>> > 1. This works as well when the signal is dispatched from the main
>> > loop thread, when it's dispatched from Squeak it blocks everything.
>> > What's the best way to handle this kind of problem? I tried to look
>> > at wxSqueak but i really didn't realize how they solved this problem.
>> >
>> > Hoping for a reply, thanks you all.
>> >
>> > --
>> > www.lethalman.net - Thoughts about internet technologies
>> >
>>
>>
>>
> 
>