python: atexit und threading

#!/usr/bin/env python

import threading, atexit, time, sys

def foo(msg):

  print "stop", msg

atexit.register(foo, "from main")

def bar():

  atexit.register(foo, "from bar")

  while True:

    time.sleep(2)

    print ">>> thread"

t = threading.Thread(target=bar).start()

cnt = 0

while True:

  time.sleep(1)

  print "main"

  cnt += 1

  if cnt == 2:

    sys.exit(1)  

#t.join()