Bugs item #1277903, was opened at 2005-08-31 23:49
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Category: None
Group: Python 2.4
Status: Open
Resolution: None
Priority: 5
Submitted By: Lenny G. Arbage (alengarbage)
Assigned to: Nobody/Anonymous (nobody)
Summary: logging module broken for multiple threads?
Initial Comment:
After upgrading from python 2.2, I noticed that the
logging facility doesn't seem to work in my code anymore.
As far as I can tell, after spending a bit of time
isolating the problem, this is an issue with threading.
In the main thread, logging works without a hitch. In
the secondary thread (which is run via
twisted.reactor), any attempt to write to the log
results in:
Traceback (most recent call last):
File "/usr/lib/python2.4/logging/__init__.py", line
712, in emit
self.stream.write(fs % msg)
ValueError: I/O operation on closed file
The code that initializes the logger is as follows:
logger = logging.getLogger('mylogger')
screenhandler = logging.StreamHandler()
screenhandler.setLevel(logging.INFO)
logger.addHandler(self.screenhandler)
logfile = "/tmp/testlog"
if os.path.isfile(logfile):
os.remove(logfile)
handler = logging.FileHandler(logfile)
formatter = logging.Formatter('%(asctime)s
%(levelname)s: %(message)s')
handler.setFormatter(formatter)
logger.addHandler(handler)
logger.setLevel(logging.INFO)
Alone, this works fine. It is only when a the second
thread does a 'logger = logging.getLogger('mylogger')
and subsequently calls 'logger.log()' that the above
error is produced.
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