8000 gh-112087: Make `list.extend(dict)` behave atomically by colesbury · Pull Request #117438 · python/cpython · GitHub
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gh-112087: Make list.extend(dict) behave atomically #117438

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Apr 2, 2024
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gh-112087: Make list.extend(dict) behave atomically #117438

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gh-112087: Make list.extend(dict) behave atomically 
Add a special case for `list.extend(dict)` and `list(dict)` so that
those patterns behave atomically with respect to modifications to the
list or dictionary.

This is required by multiprocessing, which assumes that
`list(_finalizer_registry)` is atomic.
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@colesbury
colesbury committed Apr 1, 2024
commit a1fa3fbb33adc103360b94b228fc3d4cc271e57b
5 changes: 5 additions & 0 deletions Objects/listobject.c
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Original file line number Diff line number Diff line change
Expand Up @@ -1374,6 +1374,11 @@ _list_extend(PyListObject *self, PyObject *iterable)
res = list_extend_set(self, (PySetObject *)iterable);
Py_END_CRITICAL_SECTION2();
}
else if (PyDict_CheckExact(iterable)) {
Py_BEGIN_CRITICAL_SECTION2(self, iterable);
res = list_extend_dict(self, (PyDictObject *)iterable, 0 /*keys*/);
Py_END_CRITICAL_SECTION2();
}
else if (Py_IS_TYPE(iterable, &PyDictKeys_Type)) {
PyDictObject *dict = ((_PyDictViewObject *)iterable)->dv_dict;
Py_BEGIN_CRITICAL_SECTION2(self, dict);
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