Antoine Pitrou <pit...@free.fr> added the comment:

Ok, qsize() can raise NotImplementedError on OS X, which explains quite a bit:

Exception in thread Thread-2:
Traceback (most recent call last):
  File 
"/Users/buildbot/buildarea/custom.parc-snowleopard-1/build/Lib/threading.py", 
line 737, in _bootstrap_inner
    self.run()
  File 
"/Users/buildbot/buildarea/custom.parc-snowleopard-1/build/Lib/threading.py", 
line 690, in run
    self._target(*self._args, **self._kwargs)
  File 
"/Users/buildbot/buildarea/custom.parc-snowleopard-1/build/Lib/concurrent/futures/process.py",
 line 271, in _queue_management_worker
    if not pending_work_items and call_queue.qsize() == 0:
  File 
"/Users/buildbot/buildarea/custom.parc-snowleopard-1/build/Lib/multiprocessing/queues.py",
 line 139, in qsize
    return self._maxsize - self._sem._semlock._get_value()
NotImplementedError

----------

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Python tracker <rep...@bugs.python.org>
<http://bugs.python.org/issue12456>
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