[issue10923] Python 2.7 hangs on Unicode+threading
New submission from Piotr Maślanka :
Python 2.7.1(x86 MSI), binary downloaded from python.org, hangs quite reliably.
Code:
with open(threadspecific, 'ab') as x:
txt = unicode(str_or_unicode_parameter).encode('utf8')
x.write(txt+'\r\n')
However, it doesn't hang if I insert a print statement between with and txt,
with anything. Previous testing determined that it hangs on encode().
Aforementioned code is executed in a threading environment, and it hangs in
thread that is spawned by master thread. Interpreter is left with an open file.
Same behaviour is repeatable on Python 2.5.1.
--
components: None
messages: 126390
nosy: henrietta
priority: normal
severity: normal
status: open
title: Python 2.7 hangs on Unicode+threading
versions: Python 2.7
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[issue10923] Python 2.7 hangs on Unicode+threading
Piotr Maślanka added the comment:
I runned it over again with code:
print 'Acquiring lock'
self.loglock.acquire()
print 'Attempting to convert'
if type(text) == unicode: text = text.encode('utf8', errors='strict')
print 'Opening '+threadspecific
with open(threadspecific, 'ab') as x: x.write(text+'\r\n')
print 'Closing '+threadspecific
self.loglock.release()
print 'Releasing lock'
It behaves erratically, sometimes working and yielding:
Acquiring lock
Acquiring lock
Attempting to convert
Opening threadspecific_master
Closing threadspecific_master
Releasing lock
Attempting to convert
Opening threadspecific_slave
Closing threadspecific_slave
Releasing lock
And sometimes hanging with:
Acquiring lock
Attempting to convert
Acquiring lock
Looks like a particularly nasty race condition. It gives off no exceptions.
Platform is Windows 7 x64, running with admin privileges.
--
type: -> crash
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[issue10923] Python 2.7 hangs on Unicode+threading
Piotr Maślanka added the comment: I ripped some stuff from the project I'm working on, undependencing it on any my libraries. Can someone with similar conf(Win7 x86-64, Python 2.7.1 (r271:86832, Nov 27 2010, 18:30:46) [MSC v.1500 32 bit (Intel)] on win32) confirm this? Directory configuration when I run that script was that it was in a child directory and was invoked by a script with "import child_directory". Before you say 'can't reproduce', run it at least 15 times, please. -- Added file: http://bugs.python.org/file20429/start.py ___ Python tracker <http://bugs.python.org/issue10923> ___ ___ Python-bugs-list mailing list Unsubscribe: http://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
