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

[Armin Rigo]

Armin Rigo added the comment:

Changes including a test.  The test should check all combinations of "concurrent" creation of the directory.  It hacks around at pathlib._normal_accessor.mkdir (patching "os.mkdir" has no effect, as the built-in function was already extracted and stored inside pathlib._normal_accessor).

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Added file: http://bugs.python.org/file46764/x2.diff

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