[issue28427] WeakValueDictionary next bug (with multithreading)

[Armin Rigo]

Armin Rigo added the comment:

issue28427-atomic.patch: is it still necessary to modify weakref.py so much, then?

What I had in mind was a C function with Python signature "del_if_equal(dict, key, value)"; the C function doesn't need to know about weakrefs and checking if they are dead.  The C function would simply call PyObject_GetItem() and PyObject_DelItem()---without releasing the GIL in the middle.

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<http://bugs.python.org/issue28427>
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