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gh-115999: Use light-weight lock for UNPACK_SEQUENCE_LIST #127514

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merged 2 commits into from
Dec 2, 2024
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gh-115999: Use light-weight lock for UNPACK_SEQUENCE_LIST #127514

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19b71a6
gh-115999: Use light-weight lock for UNPACK_SEQUENCE_LIST
corona10 Dec 2, 2024
9c35049
Address code review
corona10 Dec 2, 2024
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2 changes: 1 addition & 1 deletion Include/internal/pycore_opcode_metadata.h
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2 changes: 1 addition & 1 deletion Include/internal/pycore_uop_metadata.h
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13 changes: 3 additions & 10 deletions Python/bytecodes.c
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Original file line number Diff line number Diff line change
Expand Up @@ -1438,24 +1438,17 @@ dummy_func(
inst(UNPACK_SEQUENCE_LIST, (unused/1, seq -- values[oparg])) {
PyObject *seq_o = PyStackRef_AsPyObjectBorrow(seq);
DEOPT_IF(!PyList_CheckExact(seq_o));
#ifdef Py_GIL_DISABLED
PyCriticalSection cs;
PyCriticalSection_Begin(&cs, seq_o);
#endif
LOCK_OBJECT(seq_o);
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if (PyList_GET_SIZE(seq_o) != oparg) {
#ifdef Py_GIL_DISABLED
PyCriticalSection_End(&cs);
#endif
UNLOCK_OBJECT(seq_o);
DEOPT_IF(true);
}
STAT_INC(UNPACK_SEQUENCE, hit);
PyObject **items = _PyList_ITEMS(seq_o);
for (int i = oparg; --i >= 0; ) {
*values++ = PyStackRef_FromPyObjectNew(items[i]);
}
#ifdef Py_GIL_DISABLED
PyCriticalSection_End(&cs);
#endif
UNLOCK_OBJECT(seq_o);
DECREF_INPUTS();
}

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19 changes: 3 additions & 16 deletions Python/executor_cases.c.h
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19 changes: 3 additions & 16 deletions Python/generated_cases.c.h
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