[issue28448] C implemented Future doesn't work on Windows

[INADA Naoki]

INADA Naoki added the comment:

I think _WaitCancelFuture can do same thing by overriding
callers of _schedule_callbacks.

Attached patch does it, and make _schedule_callbacks private
by renaming it to __schedule_callbacks.

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Added file: http://bugs.python.org/file45139/dont-override-schedule-callbacks.patch

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