[issue17385] Use deque instead of list the threading.Condition waiter queue

[Guido van Rossum]

Guido van Rossum added the comment:

Looks fine. I'd say that it would be great to add slicing to deque!

There's one oddity in the code, but it was there before the patch -- the local variable name __waiters is pretty silly. It appears to be a micro-optimization to avoid using self._waiters more than once; even if that is worth it (I kind of doubt it), the __private name is wrong and misguided.

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<http://bugs.python.org/issue17385>
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