Thread interruption

[Yann Cointepas]

Is there any portable ( Unix and Windows) way to interrupt a thread ?

I made a program that is a graphical environment that is used to launch 
user Python scripts. Each user script is executed in its own thread 
"within" a common graphical environment provided by the main program. I 
would like to allow the user to kill a script but I found no clean and 
portable way to interrupt a thread from another thread.

Is it possible ?
Will it be possible ?

At least I realy need to interrupt a thread on Unix, can I safely use 
Python threads and a C extension module which uses libpthread ?

Thanks for any hint.
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Yann Cointepas                        Tel: +33 1 53 82 84 14
INSERM U494 - CHU Pitié-Salpêtrière   Fax: +33 1 53 82 84 48
91 Boulevard de l'Hôpital
75634 PARIS CEDEX 13 France