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gh-117657: Fixes a few small TSAN issues in dictobject #118200

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Merged
merged 2 commits into from
Apr 25, 2024
Merged

gh-117657: Fixes a few small TSAN issues in dictobject #118200

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bfc5569
Fixup TSAN errors for dict
DinoV Apr 18, 2024
62d5937
Fix more dict races:
DinoV Apr 24, 2024
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Fixup TSAN errors for dict
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@DinoV
DinoV committed Apr 23, 2024
commit bfc556950132b4c47913564c5a6517851613717d
4 changes: 4 additions & 0 deletions Include/cpython/dictobject.h
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Expand Up @@ -56,7 +56,11 @@ static inline Py_ssize_t PyDict_GET_SIZE(PyObject *op) {
PyDictObject *mp;
assert(PyDict_Check(op));
mp = _Py_CAST(PyDictObject*, op);
#ifdef Py_GIL_DISABLED
return _Py_atomic_load_ssize_relaxed(&mp->ma_used);
#else
return mp->ma_used;
#endif
}
#define PyDict_GET_SIZE(op) PyDict_GET_SIZE(_PyObject_CAST(op))

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4 changes: 2 additions & 2 deletions Objects/dictobject.c
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Expand Up @@ -1818,7 +1818,7 @@ insert_to_emptydict(PyInterpreterState *interp, PyDictObject *mp,
ep->me_hash = hash;
ep->me_value = value;
}
mp->ma_used++;
FT_ATOMIC_STORE_SSIZE_RELAXED(mp->ma_used, FT_ATOMIC_LOAD_SSIZE_RELAXED(mp->ma_used) + 1);
mp->ma_version_tag = new_version;
newkeys->dk_usable--;
newkeys->dk_nentries++;
Expand Down Expand Up @@ -2510,7 +2510,7 @@ delitem_common(PyDictObject *mp, Py_hash_t hash, Py_ssize_t ix,
Py_ssize_t hashpos = lookdict_index(mp->ma_keys, hash, ix);
assert(hashpos >= 0);

mp->ma_used--;
FT_ATOMIC_STORE_SSIZE_RELAXED(mp->ma_used, FT_ATOMIC_LOAD_SSIZE(mp->ma_used) - 1);
mp->ma_version_tag = new_version;
if (_PyDict_HasSplitTable(mp)) {
assert(old_value == mp->ma_values->values[ix]);
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3 changes: 0 additions & 3 deletions Tools/tsan/suppressions_free_threading.txt
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Expand Up @@ -27,9 +27,6 @@ race:_PyObject_GC_SET_SHARED
race:_PyObject_GC_TRACK
race:_PyType_HasFeature
race:assign_version_tag
race:compare_unicode_unicode
race:delitem_common
race:dictresize
race:gc_collect_main
race:gc_restore_tid
race:initialize_new_array
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