[issue29694] race condition in pathlib mkdir with flags parents=True

[Armin Rigo]

Armin Rigo added the comment:

Update: a review didn't show any other similar problems (pathlib.py is a thin layer after all).  Applied the fix and test (x2.diff) inside PyPy.

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue29694>
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