New submission from Armin Ronacher armin.ronac...@active-4.com:
I found a a useless lock acquiring in the 27 maintenance branch in logging and
a missing one as well:
Logger.removeHandler() locks around a handler lock, however the code executed
in this lock is not depending on anything of that lock. However there is a
race condition when two pieces of code try to remove the same handler at the
same time because between the if and the remove() no locking takes place.
I would recommend this instead (and also add locking to the addHandler):
def addHandler(self, hdlr):
Add the specified handler to this logger.
_acquireLock()
try:
if hdlr not in self.handlers:
self.handlers.append(hdlr)
finally:
_releaseLock()
def removeHandler(self, hdlr):
Remove the specified handler from this logger.
_acquireLock()
try:
if hdlr in self.handlers:
self.handlers.remove(hdlr)
finally:
_releaseLock()
I suppose in 3.x there might be something similar.
--
assignee: vinay.sajip
components: Library (Lib)
messages: 117364
nosy: aronacher, vinay.sajip
priority: normal
severity: normal
status: open
title: Improper locking in logging
type: behavior
versions: Python 2.7
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http://bugs.python.org/issue9945
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