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gh-112087: Use QSBR technique for list_new/clear for free-thread build #115875

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Merged
corona10 merged 10 commits into from
Mar 1, 2024
+29 −6
Merged

gh-112087: Use QSBR technique for list_new/clear for free-thread build #115875

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556c016
gh-112087: Use QSBR technique for list_new/clear for free-thread
corona10 Feb 24, 2024
67a7f32
Replace list_preallocate_exact to list_ensure_capacity
corona10 Feb 24, 2024
6ad0ab4
fix
corona10 Feb 24, 2024
6264094
Update test
corona10 Feb 24, 2024
e514c65
Update list_item
corona10 Feb 24, 2024
df90d37
Revert memory optimization changes
corona10 Feb 28, 2024
e7f3683
Address code review
corona10 Feb 28, 2024
0eb3657
Merge remote-tracking branch 'upstream/main' into gh-115605-qsbr
corona10 Feb 28, 2024
41204cf
Revert list_prealloc
corona10 Mar 1, 2024
9f5d048
nit
corona10 Mar 1, 2024
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Address code review
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@corona10
corona10 committed Feb 28, 2024
commit e7f36834739163092fc46ca79fc2bc963b27d93e
13 changes: 6 additions & 7 deletions Objects/listobject.c
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Original file line number Diff line number Diff line change
Expand Up @@ -497,19 +497,18 @@ static PyObject *
list_item(PyObject *aa, Py_ssize_t i)
{
PyListObject *a = (PyListObject *)aa;
PyObject *item = NULL;
if (!valid_index(i, PyList_GET_SIZE(a))) {
PyErr_SetObject(PyExc_IndexError, &_Py_STR(list_err));
return NULL;
}
PyObject *item;
Py_BEGIN_CRITICAL_SECTION(a);
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@colesbury colesbury Feb 28, 2024

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We will want the fast path to do this without locking soon.

#ifdef Py_GIL_DISABLED
if (!_PyObject_GC_IS_SHARED(a)) {
if (!_Py_IsOwnedByCurrentThread((PyObject *)a) && !_PyObject_GC_IS_SHARED(a)) {
_PyObject_GC_SET_SHARED(a);
}
#endif
if (!valid_index(i, PyList_GET_SIZE(a))) {
PyErr_SetObject(PyExc_IndexError, &_Py_STR(list_err));
goto exit;
}
item = Py_NewRef(a->ob_item[i]);
exit:
Py_END_CRITICAL_SECTION();
return item;
}
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