title: Python 2.7 SimlpeQueue Import Error (a bug?)
body: <pre><code>$ python2.6 -c 'from multiprocessing.queues import SimpleQueue'
  $ python2.7 -c 'from multiprocessing.queues import SimpleQueue'
  Traceback (most recent call last):
    File "&lt;string&gt;", line 1, in &lt;module&gt;
    File "/usr/lib/python2.7/multiprocessing/queues.py", line 22, in &lt;module&gt;
      from multiprocessing.synchronize import Lock, BoundedSemaphore, Semaphore, Condition
    File "/usr/lib/python2.7/multiprocessing/synchronize.py", line 33, in &lt;module&gt;
      " 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.
  
  $ uname -a
  Linux xxx-ubuntu-64 2.6.35-22-generic #35-Ubuntu SMP Sat Oct 16 20:45:36 UTC 2010 x86_64  GNU/Linux
  </code></pre>