Amaury Forgeot d'Arc <amaur...@gmail.com> added the comment:

> Pypy tends to make fewer guarantees because it implements 
> more classes in pure python.

This is not exactly true; in PyPy the _collection module was rewritten in 
RPython (which is translated to C) for this very reason: to make dequeue.append 
atomic and thus thread-safe.

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nosy: +amaury.forgeotdarc

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<http://bugs.python.org/issue15329>
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