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gh-112075: Make PyDictKeysObject thread-safe #114741

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Merged
DinoV merged 6 commits into from
Feb 21, 2024
Merged

gh-112075: Make PyDictKeysObject thread-safe #114741

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4715734
Make PyDictKeysObject thread-safe
DinoV Jan 22, 2024
18d2916
Fix naming of unsplit -> combined
DinoV Jan 31, 2024
61caf84
Lock less and deal with atomic updates to shared size
DinoV Feb 2, 2024
268c806
Address review feedback
DinoV Feb 8, 2024
7407ce9
Lock in dictresize, not in callers
DinoV Feb 15, 2024
a9d3666
Fixup recursive locking
DinoV Feb 20, 2024
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Fix naming of unsplit -> combined
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@DinoV
DinoV committed Feb 20, 2024
commit 18d29166d564365166b6a0db81f5d0622bae2b3d
8 changes: 4 additions & 4 deletions Objects/dictobject.c
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Original file line number Diff line number Diff line change
Expand Up @@ -1278,7 +1278,7 @@ insert_into_dictkeys(PyDictKeysObject *keys, PyObject *name)


static inline int
insert_unsplit_dict(PyInterpreterState *interp, PyDictObject *mp,
insert_combined_dict(PyInterpreterState *interp, PyDictObject *mp,
Py_hash_t hash, PyObject *key, PyObject *value, int unicode)
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{
if (mp->ma_keys->dk_usable <= 0) {
Expand Down Expand Up @@ -1325,7 +1325,7 @@ insert_split_dict(PyInterpreterState *interp, PyDictObject *mp,
assert(!_PyDict_HasSplitTable(mp));
assert(DK_IS_UNICODE(keys));
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UNLOCK_KEYS(keys);
return insert_unsplit_dict(interp, mp, hash, key, value, 1);
return insert_combined_dict(interp, mp, hash, key, value, 1);
}

Py_ssize_t hashpos = find_empty_slot(keys, hash);
Expand Down Expand Up @@ -1406,7 +1406,7 @@ insertdict(PyInterpreterState *interp, PyDictObject *mp,

int unicode = DK_IS_UNICODE(mp->ma_keys);
if (!unicode || !_PyDict_HasSplitTable(mp)) {
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if (insert_unsplit_dict(interp, mp, hash, key, value, unicode) < 0) {
if (insert_combined_dict(interp, mp, hash, key, value, unicode) < 0) {
goto Fail;
}
} else {
Expand Down Expand Up @@ -3819,7 +3819,7 @@ dict_setdefault_ref_lock_held(PyObject *d, PyObject *key, PyObject *default_valu

int unicode = DK_IS_UNICODE(mp->ma_keys);
if (!unicode || !_PyDict_HasSplitTable(mp)) {
if (insert_unsplit_dict(interp, mp, hash, Py_NewRef(key), Py_NewRef(value), unicode) < 0) {
if (insert_combined_dict(interp, mp, hash, Py_NewRef(key), Py_NewRef(value), unicode) < 0) {
Py_DECREF(key);
Py_DECREF(value);
if (result) {
Expand Down