[issue8777] Add threading.Barrier

[Kristján Valur Jónsson]

Kristján Valur Jónsson <kristjan at ccpgames.com> added the comment:

Right.
I've provided more text for the return value and provided an example.
I´ve changed all three to properties, the locking wasn't really required for waiting().
I added some extra tests for the properties.

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Added file: http://bugs.python.org/file19395/barrier4.patch

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