[issue28427] WeakValueDictionary next bug (with multithreading)

[Armin Rigo]

Armin Rigo added the comment:

I'll admit I don't know how to properly fix this issue.  What I came up with so far would need an atomic compare_and_delete operation on the dictionary self.data, so that we can do atomically:

+                elif self.data[wr.key] is wr:
                     del self.data[wr.key]

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue28427>
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