Problem with threads and signals

[Jeff Epler]

The program below works fine on my system (redhat 9)

A few months ago, debian-specific threading problems in Python were
discussed.  If you're using Debian, maybe it's relevant:
  http://groups.google.com/groups?threadm=a6562e06.0401021352.65aac82b%40posting.google.com

Jeff

import threading, os, signal, time

_shutdown = 0

class T(threading.Thread):
    def run(self):
        while not _shutdown:
            time.sleep(1)

def shutdown(signum, arg):
    global _shutdown
    print "Shutting down..."
    _shutdown = 1

def main():
    print "PID:", os.getpid()
    signal.signal(signal.SIGUSR1, shutdown)

    threads = [T(), T()]

    for th in threads:
        th.start()

    while not _shutdown:
        time.sleep(60)

if __name__ == '__main__': main()