[Python-bugs-list] [Bug #133200] cPickle does not use Py_BEGIN_ALLOW_THREADS.

Tue, 20 Feb 2001 11:54:14 -0800

Bug #133200, was updated on 2001-Feb-20 00:12
Here is a current snapshot of the bug.

Project: Python
Category: Threads
Status: Open
Resolution: None
Bug Group: None
Priority: 5
Submitted by: ianbanks
Assigned to : dcjim
Summary: cPickle does not use Py_BEGIN_ALLOW_THREADS.

Details: This bug refers to:

python/dist/src/Modules/cPickle.c
Revision 2.54 (In SourceForge)

The use of fread (line 506) and fwrite (line 410) are not wrapped by
Py_BEGIN_ALLOW_THREADS and Py_END_ALLOW_THREADS.

This causes certain uses of cPickle in threaded programs to deadlock, where
pickle does not.

Follow-Ups:

Date: 2001-Feb-20 11:54
By: fdrake

Comment:
Can you provide an example that actually deadlocks?  Please provide
platform information as well.

cPckle certainly could be more thread-friendly in the way that you suggest,
but it should not actually deadlock either.
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For detailed info, follow this link:
http://sourceforge.net/bugs/?func=detailbug&bug_id=133200&group_id=5470