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gh-129069: fix TSAN-0013 from gh-153852 #154516

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gh-129069: fix TSAN-0013 from gh-153852 #154516

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cb9567a
gh-129069: use atomic read in `_Py_SIZE_impl()`
xxyzz Jul 22, 2026
786ad9f
gh-129069: use atomic `_PyList_GetItemRef` in `stringlib_bytes_join`
xxyzz Jul 23, 2026
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gh-129069: use atomic read in _Py_SIZE_impl() 
part of TSAN-0013 in gh-153852
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@xxyzz
xxyzz committed Jul 23, 2026
commit cb9567a4a3085ed6a705a381cfb53cfc20870636
4 changes: 0 additions & 4 deletions Include/cpython/listobject.h
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Expand Up @@ -29,11 +29,7 @@ typedef struct {

static inline Py_ssize_t PyList_GET_SIZE(PyObject *op) {
PyListObject *list = _PyList_CAST(op);
#ifdef Py_GIL_DISABLED
return _Py_atomic_load_ssize_relaxed(&(_PyVarObject_CAST(list)->ob_size));
#else
return Py_SIZE(list);
#endif
}
#define PyList_GET_SIZE(op) PyList_GET_SIZE(_PyObject_CAST(op))

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6 changes: 5 additions & 1 deletion Include/object.h
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Expand Up @@ -240,7 +240,11 @@ _Py_SIZE_impl(PyObject *ob)
{
assert(Py_TYPE(ob) != &PyLong_Type);
assert(Py_TYPE(ob) != &PyBool_Type);
return _PyVarObject_CAST(ob)->ob_size;
#ifdef Py_GIL_DISABLED
return _Py_atomic_load_ssize_relaxed(&(_PyVarObject_CAST(ob)->ob_size));
#else
return _PyVarObject_CAST(ob)->ob_size;
#endif
}

static inline int
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