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

[Glenn Langford]

Glenn Langford added the comment:

> It seems more plausible that the locks around the removals are fixing the bug but I don't see how. I'll look into it some more.

It is the locks around the waiter removals that matter; I think there are only formatting changes elsewhere in the patch. The reason the locks make a difference is that there can be a race condition if multiple wait() calls compete to modify the f._waiters list.

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