[issue19227] test_multiprocessing_xxx hangs under Gentoo buildbots

[Charles-François Natali]

Charles-François Natali added the comment:

Note that no matter where the atfork-hook is executed (prepare,
parent, child), it will still be deadlock-prone in case of
double-fork, since the hook will effectively be called after the first
fork (and before the second one). And double-fork is common, e.g. when
creating daemon processes.

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<http://bugs.python.org/issue19227>
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