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

> Versions #2 and #3 have the same cost, so it's better to get rid of
> the explicit argument and always use the lock (version #3).
> Differences between #1 and #3 suggest that introducing the lock
> obviously have a cost though.
> It's not too high IMO, but I couldn't say whether it's acceptable or
> not.

It looks quite negligible to me. Nobody should be affected in practice.

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<http://bugs.python.org/issue8684>
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