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[3.15] gh-158197: Fix split dict iteration during concurrent deletion (gh-158686) - #159953
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…ythongh-158686) Read insertion order from the iterator's captured values snapshot instead of re-reading ma_values and asserting against a concurrently changing size. Retry under the dictionary lock when a value slot has been cleared. Make insertion-order writes atomic and publish size changes with release stores, pairing with the iterator's size load. Keep order-byte accesses relaxed. Add _Py_atomic_store_uint8_release() and FT_ATOMIC_STORE_UINT8_RELEASE() for this. (cherry picked from commit 4bb1dad) Co-authored-by: Neil Schemenauer <nas-github@arctrix.com>
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Read insertion order from the iterator's captured values snapshot instead
of re-reading ma_values and asserting against a concurrently changing
size. Retry under the dictionary lock when a value slot has been cleared.
Make insertion-order writes atomic and publish size changes with release
stores, pairing with the iterator's size load. Keep order-byte accesses
relaxed. Add _Py_atomic_store_uint8_release() and
FT_ATOMIC_STORE_UINT8_RELEASE() for this.
(cherry picked from commit 4bb1dad)
Co-authored-by: Neil Schemenauer nas-github@arctrix.com