Have a look at the demo (see Signal.BREAK)
http://code.google.com/p/trellis-fork/source/browse/trunk/demos/signals_demo.py
and implementation
http://code.google.com/p/trellis-fork/source/browse/trunk/mext/reaction/signal_utils.py
Signal handling is a hairy problem and I think it's great having a
well behaved glue for it in Reaction, at least I know I'll be using
signal handling more from this point on.
--
Best Regards,
Sergey Schetinin
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