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gh-111926: Make weakrefs thread-safe in free-threaded builds (#117168)

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Most mutable data is protected by a striped lock that is keyed on the
referenced object's address. The weakref's hash is protected using the
weakref's per-object lock.
 
Note that this only affects free-threaded builds. Apart from some minor
refactoring, the added code is all either gated by `ifdef`s or is a no-op
(e.g. `Py_BEGIN_CRITICAL_SECTION`).
This commit is contained in:
mpage 2024-04-08 07:58:38 -07:00 • committed by GitHub
parent e16062dd34
commit df73179048
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17 changed files with 490 additions and 326 deletions
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Python/pystate.c
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@ -506,6 +506,15 @@ _PyRuntimeState_ReInitThreads(_PyRuntimeState *runtime)
for (size_t i = 0; i < Py_ARRAY_LENGTH(locks); i++) {
_PyMutex_at_fork_reinit(locks[i]);
}
#ifdef Py_GIL_DISABLED
for (PyInterpreterState *interp = runtime->interpreters.head;
interp != NULL; interp = interp->next)
{
for (int i = 0; i < NUM_WEAKREF_LIST_LOCKS; i++) {
_PyMutex_at_fork_reinit(&interp->weakref_locks[i]);
}
}
#endif
_PyTypes_AfterFork();