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Original file line number	Diff line number	Diff line change
Expand Up		@@ -34,6 +34,9 @@ of Python objects.

		Set the object o reference counter to refcnt.

		On :ref:`Python build with Free Threading <free-threading-build>`, if
		refcnt is larger than ``UINT32_MAX``, the object is made :term:`immortal`.

		This function has no effect on :term:`immortal` objects.

		.. versionadded:: 3.9
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2 changes: 2 additions & 0 deletions 2 Doc/using/configure.rst

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Original file line number	Diff line number	Diff line change
Expand Up		@@ -287,6 +287,8 @@ General Options

		.. versionadded:: 3.11

		.. _free-threading-build:

		.. option:: --disable-gil

		Enables experimental support for running Python without the
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31 changes: 21 additions & 10 deletions 31 Include/object.h

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Original file line number	Diff line number	Diff line change
Expand Up		@@ -88,7 +88,7 @@ having all the lower 32 bits set, which will avoid the reference count to go
		beyond the refcount limit. Immortality checks for reference count decreases will
		be done by checking the bit sign flag in the lower 32 bits.
		*/
		#define _Py_IMMORTAL_REFCNT UINT_MAX
		#define _Py_IMMORTAL_REFCNT _Py_CAST(Py_ssize_t, UINT_MAX)

		#else
		/*
Expand All		@@ -103,7 +103,7 @@ immortality, but the execution would still be correct.
		Reference count increases and decreases will first go through an immortality
		check by comparing the reference count field to the immortality reference count.
		*/
		#define _Py_IMMORTAL_REFCNT (UINT_MAX >> 2)
		#define _Py_IMMORTAL_REFCNT _Py_CAST(Py_ssize_t, UINT_MAX >> 2)
		#endif

		// Py_GIL_DISABLED builds indicate immortal objects using `ob_ref_local`, which is
Expand Down Expand Up		@@ -317,11 +317,11 @@ static inline Py_ssize_t Py_SIZE(PyObject *ob) {
		static inline Py_ALWAYS_INLINE int _Py_IsImmortal(PyObject *op)
		{
		#if defined(Py_GIL_DISABLED)
		return op->ob_ref_local == _Py_IMMORTAL_REFCNT_LOCAL;
		return (op->ob_ref_local == _Py_IMMORTAL_REFCNT_LOCAL);
		#elif SIZEOF_VOID_P > 4
		return _Py_CAST(PY_INT32_T, op->ob_refcnt) < 0;
		return (_Py_CAST(PY_INT32_T, op->ob_refcnt) < 0);
		#else
		return op->ob_refcnt == _Py_IMMORTAL_REFCNT;
		return (op->ob_refcnt == _Py_IMMORTAL_REFCNT);
		#endif
		}
		#define _Py_IsImmortal(op) _Py_IsImmortal(_PyObject_CAST(op))
Expand Down Expand Up		@@ -350,15 +350,23 @@ static inline void Py_SET_REFCNT(PyObject *ob, Py_ssize_t refcnt) {
		if (_Py_IsImmortal(ob)) {
		return;
		}

		#ifndef Py_GIL_DISABLED
		ob->ob_refcnt = refcnt;
		#else
		if (_Py_IsOwnedByCurrentThread(ob)) {
		// Set local refcount to desired refcount and shared refcount to zero,
		// but preserve the shared refcount flags.
		assert(refcnt < UINT32_MAX);
		ob->ob_ref_local = _Py_STATIC_CAST(uint32_t, refcnt);
		ob->ob_ref_shared &= _Py_REF_SHARED_FLAG_MASK;
		if ((size_t)refcnt > (size_t)UINT32_MAX) {
		// On overflow, make the object immortal
		op->ob_tid = _Py_UNOWNED_TID;
		op->ob_ref_local = _Py_IMMORTAL_REFCNT_LOCAL;
		op->ob_ref_shared = 0;
		}
		else {
		// Set local refcount to desired refcount and shared refcount
		// to zero, but preserve the shared refcount flags.
		ob->ob_ref_local = _Py_STATIC_CAST(uint32_t, refcnt);
		ob->ob_ref_shared &= _Py_REF_SHARED_FLAG_MASK;
		}
		}
		else {
		// Set local refcount to zero and shared refcount to desired refcount.
Expand Down Expand Up		@@ -750,6 +758,7 @@ static inline Py_ALWAYS_INLINE void Py_INCREF(PyObject *op)
		uint32_t local = _Py_atomic_load_uint32_relaxed(&op->ob_ref_local);
		uint32_t new_local = local + 1;
		if (new_local == 0) {
		// local is equal to _Py_IMMORTAL_REFCNT: do nothing
		return;
		}
		if (_Py_IsOwnedByCurrentThread(op)) {
Expand All		@@ -763,6 +772,8 @@ static inline Py_ALWAYS_INLINE void Py_INCREF(PyObject *op)
		PY_UINT32_T cur_refcnt = op->ob_refcnt_split[PY_BIG_ENDIAN];
		PY_UINT32_T new_refcnt = cur_refcnt + 1;
		if (new_refcnt == 0) {
		// cur_refcnt is equal to _Py_IMMORTAL_REFCNT: the object is immortal,
		// do nothing
		return;
		}
		op->ob_refcnt_split[PY_BIG_ENDIAN] = new_refcnt;
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