gh-113956: Make intern_common thread-safe in free-threaded build#148886
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colesbury wants to merge 2 commits intopython:mainfrom
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gh-113956: Make intern_common thread-safe in free-threaded build#148886colesbury wants to merge 2 commits intopython:mainfrom
colesbury wants to merge 2 commits intopython:mainfrom
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Avoid racing with the owning thread's refcount operations when immortalizing an interned string: if we don't own it and its refcount isn't merged, intern a copy we own instead. Use atomic stores in _Py_SetImmortalUntracked so concurrent atomic reads are race-free.
colesbury
added
topic-free-threading
needs backport to 3.14
mpage
approved these changes
Apr 23, 2026
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Avoid racing with the owning thread's refcount operations when immortalizing an interned string: if we don't own it and its refcount isn't merged, intern a copy we own instead. Use atomic stores in _Py_SetImmortalUntracked so concurrent atomic reads are race-free.
_Py_SetImmortalmust be run on allocating thread (no-gil) #113956