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GH-91052: Add C API for watching dictionaries (GH-31787)

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Carl Meyer 2022-10-06 17:08:00 -07:00 • committed by GitHub
parent 683ab85955
commit a4b7794887
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10 changed files with 487 additions and 17 deletions
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5
Python/ceval.c
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@ -3252,6 +3252,7 @@ handle_eval_breaker:
uint16_t hint = cache->index;
DEOPT_IF(hint >= (size_t)dict->ma_keys->dk_nentries, STORE_ATTR);
PyObject *value, *old_value;
uint64_t new_version;
if (DK_IS_UNICODE(dict->ma_keys)) {
PyDictUnicodeEntry *ep = DK_UNICODE_ENTRIES(dict->ma_keys) + hint;
DEOPT_IF(ep->me_key != name, STORE_ATTR);
@ -3259,6 +3260,7 @@ handle_eval_breaker:
DEOPT_IF(old_value == NULL, STORE_ATTR);
STACK_SHRINK(1);
value = POP();
new_version = _PyDict_NotifyEvent(PyDict_EVENT_MODIFIED, dict, name, value);
ep->me_value = value;
}
else {
@ -3268,6 +3270,7 @@ handle_eval_breaker:
DEOPT_IF(old_value == NULL, STORE_ATTR);
STACK_SHRINK(1);
value = POP();
new_version = _PyDict_NotifyEvent(PyDict_EVENT_MODIFIED, dict, name, value);
ep->me_value = value;
}
Py_DECREF(old_value);
@ -3277,7 +3280,7 @@ handle_eval_breaker:
_PyObject_GC_TRACK(dict);
}
/* PEP 509 */
dict->ma_version_tag = DICT_NEXT_VERSION();
dict->ma_version_tag = new_version;
Py_DECREF(owner);
JUMPBY(INLINE_CACHE_ENTRIES_STORE_ATTR);
DISPATCH();

4
Python/pystate.c
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@ -451,6 +451,10 @@ interpreter_clear(PyInterpreterState *interp, PyThreadState *tstate)
Py_CLEAR(interp->sysdict);
Py_CLEAR(interp->builtins);
for (int i=0; i < DICT_MAX_WATCHERS; i++) {
interp->dict_watchers[i] = NULL;
}
// XXX Once we have one allocator per interpreter (i.e.
// per-interpreter GC) we must ensure that all of the interpreter's
// objects have been cleaned up at the point.