[issue20319] concurrent.futures.wait() can block forever even if Futures have completed

[Glenn Langford]

Glenn Langford added the comment:

An idea for a different possible fix - rather than cleaning up waiters in wait() and as_completed(), could they be removed in Future.set_result() and Futures.set_exception() ? 

I'm not certain if any waiter should ever be notified twice; if not, perhaps set_result() and set_exception() could just include

self._waiters = []

after all waiters have been signalled.

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue20319>
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