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Issue #18277: Merge.

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Richard Oudkerk 2013-06-24 14:52:14 +01:00
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Doc/library/multiprocessing.rst
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@ -515,6 +515,23 @@ Note that one can also create a shared queue by using a manager object -- see
the :mod:`multiprocessing` namespace so you need to import them from
:mod:`queue`.
.. note::
When an object is put on a queue, the object is pickled and a
background thread later flushes the pickled data to an underlying
pipe. This has some consequences which are a little surprising,
but should not cause any pratical difficulties -- you can always
use a managed queue if they really bother you.
(1) After putting an object on an empty queue there may be an
infinitessimal delay before the queue's :meth:`~Queue.empty`
method returns :const:`False` and :meth:`~Queue.get_nowait` can
return without raising :exc:`Queue.Empty`.
(2) If multiple processes are enqueuing objects, it is possible for
the objects to be received at the other end out-of-order.
However, objects enqueued by the same process will always be in
the expected order with respect to each other.
.. warning::