8000 [3.13] gh-132070: Use _PyObject_IsUniquelyReferenced in unicodeobject (gh-133039) by miss-islington · Pull Request #133121 · python/cpython · GitHub
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[3.13] gh-132070: Use _PyObject_IsUniquelyReferenced in unicodeobject (gh-133039) #133121

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[3.13] gh-132070: Use _PyObject_IsUniquelyReferenced in unicodeobject (gh-133039) #133121

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gh-132070: Use _PyObject_IsUniquelyReferenced in unicodeobject (gh-13…
corona10 Apr 29, 2025
143bba0
Add _PyObject_IsUniquelyReferenced
corona10 Apr 29, 2025
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Add _PyObject_IsUniquelyReferenced
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@corona10
corona10 committed Apr 29, 2025
commit 143bba0ddf3c66a65f0721cd214b426ffcc0c6d3
17 changes: 17 additions & 0 deletions Include/internal/pycore_object.h
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Expand Up @@ -165,6 +165,23 @@ static inline void _Py_RefcntAdd(PyObject* op, Py_ssize_t n)
extern void _Py_SetImmortal(PyObject *op);
extern void _Py_SetImmortalUntracked(PyObject *op);

// Checks if an object has a single, unique reference. If the caller holds a
// unique reference, it may be able to safely modify the object in-place.
static inline int
_PyObject_IsUniquelyReferenced(PyObject *ob)
{
#if !defined(Py_GIL_DISABLED)
return Py_REFCNT(ob) == 1;
#else
// NOTE: the entire ob_ref_shared field must be zero, including flags, to
// ensure that other threads cannot concurrently create new references to
// this object.
return (_Py_IsOwnedByCurrentThread(ob) &&
_Py_atomic_load_uint32_relaxed(&ob->ob_ref_local) == 1 &&
_Py_atomic_load_ssize_relaxed(&ob->ob_ref_shared) == 0);
#endif
}

// Makes an immortal object mortal again with the specified refcnt. Should only
// be used during runtime finalization.
static inline void _Py_SetMortal(PyObject *op, Py_ssize_t refcnt)
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