have you tried replacing : main = threading._MainThread()
with main = threading.currentThread() ? (not sure if that will be sufficient) Well your way to pass exception between threads looks like I would have done myself. But I am no expert. Have you considered using stackless Python ? It provides a much safer and efficient threading model (thinking about your physics simulator). Of course, if you want not to block on blocking calls (socket stuff), real threads are a way to go. -- http://mail.python.org/mailman/listinfo/python-list
