Logging and threading

[usenet]

I'm having some problems getting the logging module to work with the
threading module. I've narrowed the problem down to the following
code:

import logging, threading

update_log = logging.getLogg er('update_log' )
update_log.addH andler(logging. FileHandler("/tmp/update_log"))

class dlThread(thread ing.Thread):
def __init__(self):
threading.Threa d.__init__(self )

def run(self):
ul = logging.getLogg er('update_log' )
ul.warn("log this")
print "finished"

t = dlThread()
t.start()

When executed, I receive the following exception:

Traceback (most recent call last):
File "/usr/local/lib/python2.4/logging/__init__.py", line 735, in
emit
self.stream.wri te(fs % msg)
ValueError: I/O operation on closed file

The exception isn't fatal though, as the print "finished" line is
executed. Alternately, if I run dlThread.run directly everything works
as I would expect, albeit without the multithreading. Since the
logging module is advertised as being threadsafe, I suspect there's
something basic I don't understand about threads.

-Alex

[usenet]

As simple and as obvious as I expected, thanks Dennis.

-Alex