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gh-135380: enhance critical section held assertions #135381

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Merged
merged 2 commits into from
Jun 20, 2025
Merged

gh-135380: enhance critical section held assertions #135381

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1efdad4
enhance critical section held assertions
kumaraditya303 Jun 11, 2025
3620385
code review
kumaraditya303 Jun 12, 2025
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24 changes: 23 additions & 1 deletion Include/internal/pycore_critical_section.h
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Original file line number Diff line number Diff line change
Expand Up @@ -64,7 +64,7 @@ extern "C" {

# define _Py_CRITICAL_SECTION_ASSERT_OBJECT_LOCKED(op) \
if (Py_REFCNT(op) != 1) { \
_Py_CRITICAL_SECTION_ASSERT_MUTEX_LOCKED(&_PyObject_CAST(op)->ob_mutex); \
_PyCriticalSection_AssertHeldObj((PyObject *) op); \
}

#else /* Py_DEBUG */
Expand Down Expand Up @@ -239,6 +239,28 @@ _PyCriticalSection_AssertHeld(PyMutex *mutex)
#endif
}

static inline void
_PyCriticalSection_AssertHeldObj(PyObject *op)
{
#ifdef Py_DEBUG
PyMutex *mutex = &_PyObject_CAST(op)->ob_mutex;
PyThreadState *tstate = _PyThreadState_GET();
uintptr_t prev = tstate->critical_section;
if (prev & _Py_CRITICAL_SECTION_TWO_MUTEXES) {
PyCriticalSection2 *cs = (PyCriticalSection2 *)(prev & ~_Py_CRITICAL_SECTION_MASK);
_PyObject_ASSERT_WITH_MSG(op,
(cs != NULL && (cs->_cs_base._cs_mutex == mutex || cs->_cs_mutex2 == mutex)),
"Critical section of object is not held");
}
else {
PyCriticalSection *cs = (PyCriticalSection *)(tstate->critical_section & ~_Py_CRITICAL_SECTION_MASK);
_PyObject_ASSERT_WITH_MSG(op,
(cs != NULL && cs->_cs_mutex == mutex),
"Critical section of object is not held");
}

#endif
}
#endif /* Py_GIL_DISABLED */

#ifdef __cplusplus
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