Python pushed to document concurrency and memory models
Mark Shannon argues CPython still lacks written guarantees on atomicity and threading for GIL and free-threaded builds as the global lock is phased out.
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PEP 805 proposes race-free parallel Python by default
Mark Shannon’s plan would require explicit sharing of objects across threads, building on free-threading work with runtime checks and freezing.
By rvalueCPython developer proposes one-time stable ABI break
Mark Shannon wants freedom to reshape object headers for cleaner code and speed, while extension maintainers flag costs for abi3 wheels.
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