I'm trying to use atexit in a Process, but unfortunately it doesn't seem to work. Here's some example code:

import time
import atexit
import logging
import multiprocessing

logging.basicConfig(level=logging.DEBUG)

class W(multiprocessing.Process):
    def run(self):
        logging.debug("%s Started" % self.name)

        @atexit.register
        def log_terminate():
             # ever called?
             logging.debug("%s Terminated!" % self.name)

        while True:
            time.sleep(10)

@atexit.register
def log_exit():
    logging.debug("Main process terminated")

logging.debug("Main process started")

a = W()
b = W()
a.start()
b.start()
time.sleep(1)
a.terminate()
b.terminate()

The output of this code is:

DEBUG:root:Main process started
DEBUG:root:W-1 Started
DEBUG:root:W-2 Started
DEBUG:root:Main process terminated

I would expect that the W.run.log_terminate() would be called when a.terminate() and b.terminate() are called, and the output to be something likeso (emphasis added)!:

DEBUG:root:Main process started
DEBUG:root:W-1 Started
DEBUG:root:W-2 Started
DEBUG:root:W-1 Terminated!
DEBUG:root:W-2 Terminated!
DEBUG:root:Main process terminated

Why isn't this working, and is there a better way to log a message (from the Process context) when a Process is terminated?

Thank you for your input - it's much appreciated.