python 2.7 & sem_open

Jakub Bogusz qboosh at
Tue Sep 28 19:58:05 CEST 2010

On Tue, Sep 28, 2010 at 05:11:01PM +0200, Patryk Zawadzki wrote:
> Multiprocessing seems to be broken in our python packages:
> $ python -c 'from multiprocessing.queues import SimpleQueue'
> Traceback (most recent call last):
>   File "<string>", line 1, in <module>
>   File "/usr/share/python2.7/multiprocessing/", line 22, in <module>
>   File "/usr/share/python2.7/multiprocessing/", line 33,
> in <module>
> ImportError: This platform lacks a functioning sem_open
> implementation, therefore, the required synchronization primitives
> needed will not function, see issue 3770.
> Mentioned bug 3770? claims that sem_open support is checked for at
> build time. The test case is this:

IMO API check should be enough on builders (when build host is not
the destination machine).

> It seems our builders don't have semaphore support in their kernels
> (or the syscalls are being filtered by some security mechanism).
> This results in partially broken python (and renders me unable to use celery).

/dev/shm mounted?

Jakub Bogusz

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