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Problem with multiprocessing module from Python
- From: Jean-Pierre Flori <jpflori at gmail dot com>
- To: cygwin at cygwin dot com
- Date: Fri, 25 Oct 2013 17:08:50 +0200
- Subject: Problem with multiprocessing module from Python
- Authentication-results: sourceware.org; auth=none
Thanks a lot once more for the great software.
During my last attempt to build Sage on Cygwin (32), I mainly have
only one problem left: using the multiprocessing module from python is
I was using Cygwin 1.7.25 within a Windows XP virtual machine (VirtualBox 4.3).
This is true both with Cygwin's shipped Python 2.7.x and the one I
built for Sage.
Here is a small snippet of code reproducing the problem:
[Blah python stuff]
>>> from multiprocessing import Pool
>>> p = Pool(3)
>>> p.map(anything suitable)
ValueError: semaphore or lock released too many times
This might be a problem with Python but I seem to remember succeeding
in this test some time ago with the same version of Python.
I tried Cygwin's GCC (4.7.3) and a custom built FSF GCC 4.8.2 without success.
I also tried to replace Cygwin binaries with version 1.7.0 and a few
others before 1.7.25 without apparent changes.
So I'm a little lost now.
Can anyone reporduce that?
Any help would be appreciated!
I have another quite unrelated question while I'm here:
I recently had trouble because in Sage two DLLs ended up with the same
name and wanted to be loaded at the same time, resulting in a "cannot
reloacte blah.dll at the same address".
Renaming one of the dll (C file and rebuilding) solved the problem.
I assume this is a windows limitations, is that right?
Thanks in advance for your help,
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