Python Process won't call atexit

Question

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.

Solution

EDIT: Based on solution suggested by Alex Martelli, the following works as expected:

import sys
import time
import atexit
import signal
import logging
import multiprocessing

logging.basicConfig(level=logging.DEBUG)

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

        def log_terminate(num, frame):
             logging.debug("%s Terminated" % self.name)
             sys.exit()
        signal.signal(signal.SIGTERM, log_terminate)
        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()

It's worthwhile to note the following comment in the atexit documentation:

Note: the functions registered via this module are not called when the program is killed by a signal, when a Python fatal internal error is detected, or when os._exit() is called.

Answer 1

나는 그 문제를 해결했습니다.

넷 솔루션이 간단했습니다.데이터베이스를 수동으로 업그레이드 한 후에.나는 마법사를 다시 시작하고 그 후에도 여전히 작동합니다.