[docs] [issue8865] select.poll is not thread safe

[Christian Schubert]

Christian Schubert <bugs at apexo.de> added the comment:

the other issue (poll_register freeing data structures that poll_poll currently uses) can be reproduced by the attached script (at least I can)

depending on the parameters/circumstances it either segfaults or prints garbage results from poll, e.g. [(1684955474, 28192)]; the expected result would be [(3, 1)]

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Added file: http://bugs.python.org/file17511/concurrent_poll_and_register.py

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<http://bugs.python.org/issue8865>
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