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gh-127521: Mark list as "shared" before resizing if necessary #127524

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Merged
colesbury merged 1 commit into from
Dec 2, 2024
Merged

gh-127521: Mark list as "shared" before resizing if necessary #127524

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20 changes: 20 additions & 0 deletions 20 Objects/listobject.c
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Original file line number Diff line number Diff line change
Expand Up @@ -68,6 +68,20 @@ free_list_items(PyObject** items, bool use_qsbr)
#endif
}

static void
ensure_shared_on_resize(PyListObject *self)
{
#ifdef Py_GIL_DISABLED
// Ensure that the list array is freed using QSBR if we are not the
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// owning thread.
if (!_Py_IsOwnedByCurrentThread((PyObject *)self) &&
!_PyObject_GC_IS_SHARED(self))
{
_PyObject_GC_SET_SHARED(self);
}
#endif
}

/* Ensure ob_item has room for at least newsize elements, and set
* ob_size to newsize. If newsize > ob_size on entry, the content
* of the new slots at exit is undefined heap trash; it's the caller's
Expand Down Expand Up @@ -117,6 +131,8 @@ list_resize(PyListObject *self, Py_ssize_t newsize)
if (newsize == 0)
new_allocated = 0;

ensure_shared_on_resize(self);

#ifdef Py_GIL_DISABLED
_PyListArray *array = list_allocate_array(new_allocated);
if (array == NULL) {
Expand Down Expand Up @@ -804,6 +820,9 @@ list_clear_impl(PyListObject *a, bool is_resize)
Py_XDECREF(items[i]);
}
#ifdef Py_GIL_DISABLED
if (is_resize) {
ensure_shared_on_resize(a);
}
bool use_qsbr = is_resize && _PyObject_GC_IS_SHARED(a);
#else
bool use_qsbr = false;
Expand Down Expand Up @@ -3069,6 +3088,7 @@ list_sort_impl(PyListObject *self, PyObject *keyfunc, int reverse)
Py_XDECREF(final_ob_item[i]);
}
#ifdef Py_GIL_DISABLED
ensure_shared_on_resize(self);
bool use_qsbr = _PyObject_GC_IS_SHARED(self);
#else
bool use_qsbr = false;
Expand Down
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