[issue28427] WeakValueDictionary next bug (with multithreading)

[Serhiy Storchaka]

Serhiy Storchaka added the comment:

Following patch fixes more cases. But I don't think it fixes race conditions, it just makes them less likely.

Increased priority because this bug makes weakref.WeakValueDictionary unusable in multithread program.

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components: +Library (Lib)
priority: normal -> critical
Added file: http://bugs.python.org/file45215/issue28427-2.patch

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