8000 gh-120837: Update _Py_DumpExtensionModules to be async-signal-safe by corona10 · Pull Request #121051 · python/cpython · GitHub
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gh-120837: Update _Py_DumpExtensionModules to be async-signal-safe #121051

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Merged
merged 8 commits into from
Jun 27, 2024
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gh-120837: Update _Py_DumpExtensionModules to be async-signal-safe #121051

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gh-120837: Update _Py_DumpExtensionModules to be async-signal-safe
corona10 Jun 26, 2024
07962e5
nit
corona10 Jun 26, 2024
1f56fcc
fix
corona10 Jun 26, 2024
e7f24af
Address code review
corona10 Jun 27, 2024
ed9bb3b
Address code review
corona10 Jun 27, 2024
136e8d1
nit
corona10 Jun 27, 2024
61de424
Address code review
corona10 Jun 27, 2024
2d31780
Address code review
corona10 Jun 27, 2024
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@corona10
corona10 committed Jun 27, 2024
commit e7f24af4c642a1ee49dd8f9ada6f16fb6818b0b1
3 changes: 2 additions & 1 deletion Python/pylifecycle.c
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Original file line number Diff line number Diff line change
Expand Up @@ -2915,7 +2915,8 @@ release_dict_lock_for_dump(PyObject *obj) {
#ifdef Py_GIL_DISABLED
PyMutex *mutex = &obj->ob_mutex;
uint8_t expected = _Py_LOCKED;
// Do not wake up other threads.
// We can not call PyMutex_Unlock because it's not async-signal-safe.
// So not to wake up other threads, we just use a simple CAS in here.
_Py_atomic_compare_exchange_uint8(&mutex->_bits, &expected, _Py_UNLOCKED);
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Do we have to run for loop to prevent CAS failure?

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I think this should be a _Py_atomic_store_uint8(&mutex->_bits, _Py_UNLOCKED)

#else
return;
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