[3.13] gh-120858: PyDict_Next should not lock the dict (GH-120859) #120964
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PyDict_Next no longer locks the dictionary in the free-threaded build. Locking around individual PyDict_Next calls is not sufficient because the function returns borrowed references and because it allows concurrent modifications during the iteraiton loop. The internal locking also interferes with correct external synchronization because it may suspend outer critical sections created by the caller. (cherry picked from commit 375b723) Co-authored-by: Sam Gross <colesbury@gmail.com>
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PyDict_Next no longer locks the dictionary in the free-threaded build. Locking
around individual PyDict_Next calls is not sufficient because the function
returns borrowed references and because it allows concurrent modifications
during the iteraiton loop.
The internal locking also interferes with correct external synchronization
because it may suspend outer critical sections created by the caller.
(cherry picked from commit 375b723)
Co-authored-by: Sam Gross colesbury@gmail.com
PyDict_Nextshould not lock the dict #120858📚 Documentation preview 📚: https://cpython-previews--120964.org.readthedocs.build/