multithreading with gtkada

[evangeli <evangeli@cnam.fr>]

hi all

it seems that gtk doesnt support multi-threading (see 
http://www.faqs.org/faqs/x-faq/part7/section-15.html).
My problem is the following :
my app opens a windows, which on the show event launch a task wich makes 
a long computation. The window also contains a cancel button which can 
be pressed to abort this task.The problem is that i would like this task 
to make X-Call, and that is apparently not possible and give me 
unavoidably the following error message:
----------------------------------------------
Xlib: unexpected async reply (sequence 0x9fe)!
----------------------------------------------
i havent found any solution which doesn't use several tasks.

1) Am i clear?
2) Do u have any idea of a different way to do that?
3) why this cruel destiny?

thanks for any response