[issue18882] Add threading.main_thread() function

[Andrew Svetlov]

Andrew Svetlov added the comment:

http://bugs.python.org/issue16500 is required to make work after fork from thread other than the main one.

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dependencies: +Add an 'atfork' module

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue18882>
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