It is a bit awkward to respond to my posting but I have some updates. I created two simple test programs, one uses threading and another uses multiprocessing.
What I found was: (1) test program with threading Only main thread receives SIGINT (generated thread won't receive SIGINT) (2) test program with multiprocessing Both processes receives SIGINT. OS apparently distributes the SIGINT event to processes associated with the terminal. (3) signal handler I realized that I could assign a signal handler specific to a process by placing it to a worker method. def worker(): # this process ignores SIGINT signal.signal(signal.SIGINT, signal.SIG_IGN) ... the rest ... def main(): process = multiprocessing.Process(target=worker) process.start() (4) terminating the spawned process I needed to send a shutdown message to the process via a communication between two processes. You can use Process.terminate() to brutally kill the process but that is a last resort. Now my program can shutdown elegantly when I type Ctrl-C. I see a big potential in multiprocessing as more PCs now have multi- Core CPU. Aki- -- http://mail.python.org/mailman/listinfo/python-list
