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gh-129824: Fix data race in _PyBuiltins_AddExceptions with subinterpreters by colesbury · Pull Request #143446 · python/cpython · GitHub

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gh-129824: Fix data race in _PyBuiltins_AddExceptions with subinterpreters #143446

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Merged
colesbury merged 2 commits into from
Jan 6, 2026
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gh-129824: Fix data race in _PyBuiltins_AddExceptions with subinterpreters #143446

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gh-129824: Fix data race in _PyBuiltins_AddExceptions with subinterpr…
colesbury Jan 5, 2026
8b1a2f9
Remove redundant lines
colesbury Jan 5, 2026
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39 changes: 16 additions & 23 deletions Objects/exceptions.c
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Original file line number Diff line number Diff line change
Expand Up @@ -25,14 +25,6 @@ class BaseExceptionGroup "PyBaseExceptionGroupObject *" "&PyExc_BaseExceptionGro
/*[clinic end generated code: output=da39a3ee5e6b4b0d input=b7c45e78cff8edc3]*/


/* Compatibility aliases */
PyObject *PyExc_EnvironmentError = NULL; // borrowed ref
PyObject *PyExc_IOError = NULL; // borrowed ref
#ifdef MS_WINDOWS
PyObject *PyExc_WindowsError = NULL; // borrowed ref
#endif


static struct _Py_exc_state*
get_exc_state(void)
{
Expand Down Expand Up @@ -2528,6 +2520,13 @@ MiddlingExtendsException(PyExc_OSError, ProcessLookupError, OSError,
MiddlingExtendsException(PyExc_OSError, TimeoutError, OSError,
"Timeout expired.");

/* Compatibility aliases */
PyObject *PyExc_EnvironmentError = (PyObject *)&_PyExc_OSError; // borrowed ref
PyObject *PyExc_IOError = (PyObject *)&_PyExc_OSError; // borrowed ref
#ifdef MS_WINDOWS
PyObject *PyExc_WindowsError = (PyObject *)&_PyExc_OSError; // borrowed ref
#endif

/*
* EOFError extends Exception
*/
Expand Down Expand Up @@ -4599,23 +4598,17 @@ _PyBuiltins_AddExceptions(PyObject *bltinmod)
if (PyDict_SetItemString(mod_dict, "ExceptionGroup", PyExc_ExceptionGroup)) {
return -1;
}

#define INIT_ALIAS(NAME, TYPE) \
do { \
PyExc_ ## NAME = PyExc_ ## TYPE; \
if (PyDict_SetItemString(mod_dict, # NAME, PyExc_ ## TYPE)) { \
return -1; \
} \
} while (0)

INIT_ALIAS(EnvironmentError, OSError);
INIT_ALIAS(IOError, OSError);
if (PyDict_SetItemString(mod_dict, "EnvironmentError", PyExc_OSError)) {
return -1;
}
if (PyDict_SetItemString(mod_dict, "IOError", PyExc_OSError)) {
return -1;
}
#ifdef MS_WINDOWS
INIT_ALIAS(WindowsError, OSError);
if (PyDict_SetItemString(mod_dict, "WindowsError", PyExc_OSError)) {
return -1;
}
#endif

#undef INIT_ALIAS

return 0;
}

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