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gh-100227: Make the Global Interned Dict Safe for Isolated Interpreters #102925

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Merged
ericsnowcurrently merged 17 commits into from
Mar 23, 2023
Merged

gh-100227: Make the Global Interned Dict Safe for Isolated Interpreters #102925

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546b934
Factor out add_threadstate().
ericsnowcurrently Mar 21, 2023
0bcd136
Add _PyThreadState_InitDetached().
ericsnowcurrently Mar 21, 2023
35d5310
Add _PyThreadState_ClearDetached().
ericsnowcurrently Mar 21, 2023
cba9e34
Add _PyRuntime.cached_objects.main_tstate.
ericsnowcurrently Mar 21, 2023
3b1bb8b
Add _Py_AcquireGlobalObjectsState() and _Py_ReleaseGlobalObjectsState().
ericsnowcurrently Mar 22, 2023
eb42aa1
Add _Py_AddToGlobalDict().
ericsnowcurrently Mar 22, 2023
4e9da2d
Drop _Py_AcquireGlobalObjectsState() and _Py_ReleaseGlobalObjectsStat…
ericsnowcurrently Mar 22, 2023
6216207
Add acquire_global_objects_lock() and release_global_objects_lock().
ericsnowcurrently Mar 22, 2023
3c007c0
Add some TODO comments.
ericsnowcurrently Mar 13, 2023
7d95514
Factor out store_interned().
ericsnowcurrently Mar 20, 2023
5c20b84
Store a thread state to use just for interned strings.
ericsnowcurrently Mar 20, 2023
a3ae02a
Always use the main interpreter when possibly resizing the interned d…
ericsnowcurrently Mar 20, 2023
d5fbc37
Use _PyRuntime.cached_objects.main_tstate instead.
ericsnowcurrently Mar 21, 2023
459325f
Add _PyThreadState_IsBound() and _PyThreadState_Unbind().
ericsnowcurrently Mar 21, 2023
4f25244
Make sure the one-off tstate is bound before using it.
ericsnowcurrently Mar 21, 2023
e68535a
Use _Py_AcquireGlobalObjectsState() in store_interned().
ericsnowcurrently Mar 22, 2023
22753b3
Use _Py_AddToGlobalDict().
ericsnowcurrently Mar 22, 2023
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Use _Py_AddToGlobalDict().
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@ericsnowcurrently
ericsnowcurrently committed Mar 22, 2023
commit 22753b33ad22bd50ba9ce207de6a41311c1e6ca1
30 changes: 2 additions & 28 deletions Objects/unicodeobject.c
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Original file line number Diff line number Diff line change
Expand Up @@ -14585,31 +14585,6 @@ _PyUnicode_InitTypes(PyInterpreterState *interp)
}


static inline PyObject *
store_interned(PyObject *obj)
{
PyObject *interned = get_interned_dict();
assert(interned != NULL);

/* Swap to the main interpreter, if necessary. */
PyInterpreterState *interp = _PyInterpreterState_GET();
PyThreadState *oldts = _Py_AcquireGlobalObjectsState(interp);

/* This might trigger a resize, which is why we must "acquire"
the global object state. */
PyObject *t = PyDict_SetDefault(interned, obj, obj);
if (t == NULL) {
PyErr_Clear();
}

/* Swap back. */
if (oldts != NULL) {
_Py_ReleaseGlobalObjectsState(oldts);
}

return t;
}

void
PyUnicode_InternInPlace(PyObject **p)
{
Expand All @@ -14633,16 +14608,15 @@ PyUnicode_InternInPlace(PyObject **p)
return;
}

PyObject *t = store_interned(s);
PyObject *interned = get_interned_dict();
PyObject *t = _Py_AddToGlobalDict(interned, s, s);
if (t != s) {
if (t != NULL) {
Py_SETREF(*p, Py_NewRef(t));
}
return;
}

// XXX Immortalize the object.

/* The two references in interned dict (key and value) are not counted by
refcnt. unicode_dealloc() and _PyUnicode_ClearInterned() take care of
this. */
Expand Down