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gh-113743: Make the MRO cache thread-safe in free-threaded builds (#113930)

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Makes _PyType_Lookup thread safe, including:
    Thread safety of the underlying cache.
    Make mutation of mro and type members thread safe
    Also _PyType_GetMRO and _PyType_GetBases are currently returning borrowed references which aren't safe.
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Dino Viehland 2024-02-15 10:54:57 -08:00 • committed by GitHub
parent e74fa294c9
commit ae460d450a
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11 changed files with 500 additions and 80 deletions
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Python/pystate.c
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@ -395,6 +395,7 @@ _Py_COMP_DIAG_POP
&(runtime)->atexit.mutex, \
&(runtime)->audit_hooks.mutex, \
&(runtime)->allocators.mutex, \
&(runtime)->types.type_mutex, \
}
static void
@ -499,6 +500,8 @@ _PyRuntimeState_ReInitThreads(_PyRuntimeState *runtime)
_PyMutex_at_fork_reinit(locks[i]);
}
_PyTypes_AfterFork();
/* bpo-42540: id_mutex is freed by _PyInterpreterState_Delete, which does
* not force the default allocator. */
if (_PyThread_at_fork_reinit(&runtime->interpreters.main->id_mutex) < 0) {