Multiprocessing module broken in Python 2.7

[Assad Khan]

Binary package hint: python2.7

Attempting to use the multiprocessing module to create a queue with Python 2.7-6 on AMD64 Maverick raises an ImportError exception. The same code works fine in Python 2.6.6-2ubuntu1 and I can provide it if necessary.

Issue 3770 was about a compilation error - is the python2.7 package being built differently than python in Maverick?

Traceback (most recent call last):
  File "slapbot.py", line 893, in <module>
    main()
  File "slapbot.py", line 879, in main
    protocol.parse_line(line)
  File "slapbot.py", line 155, in parse_line
    messages[line[1]](line)
  File "slapbot.py", line 421, in parse_cmd
    commands[cmd[0].lower()](cmd_data)
  File "slapbot.py", line 827, in cmd_metar
    q = multiprocessing.Queue()
  File "/usr/lib/python2.7/multiprocessing/__init__.py", line 212, in Queue
    from multiprocessing.queues import Queue
  File "/usr/lib/python2.7/multiprocessing/queues.py", line 22, in <module>
    from multiprocessing.synchronize import Lock, BoundedSemaphore, Semaphore, Condition
  File "/usr/lib/python2.7/multiprocessing/synchronize.py", line 33, in <module>
    " function, see issue 3770.")
ImportError: This platform lacks a functioning sem_open implementation, therefore, the required synchronization primitives needed will not function, see issue 3770.

ProblemType: Bug
DistroRelease: Ubuntu 10.10
Package: python2.7 2.7-6
ProcVersionSignature: Ubuntu 2.6.35-22.35-generic 2.6.35.4
Uname: Linux 2.6.35-22-generic x86_64
Architecture: amd64
Date: Wed Nov 10 17:19:43 2010
InstallationMedia: Ubuntu 10.10 "Maverick Meerkat" - Release amd64 (20101007)
ProcEnviron:
 PATH=(custom, user)
 LANG=en_US.utf8
 SHELL=/bin/bash
SourcePackage: python2.7

[Eugen Pyvovarov (bsn.dev)]

see the same bug when trying to use celery(http://celeryproject.org/)

[Launchpad Janitor (janitor)]

Status changed to 'Confirmed' because the bug affects multiple users.