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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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Add _Py_AddToGlobalDict().
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@ericsnowcurrently
ericsnowcurrently committed Mar 22, 2023
commit eb42aa1a83df5e29dc73dad442ae7306f92cca9d
2 changes: 2 additions & 0 deletions Include/internal/pycore_pystate.h
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Expand Up @@ -133,6 +133,8 @@ extern void _PyThreadState_ClearDetached(PyThreadState *);
extern PyThreadState * _Py_AcquireGlobalObjectsState(PyInterpreterState *);
extern void _Py_ReleaseGlobalObjectsState(PyThreadState *);

extern PyObject * _Py_AddToGlobalDict(PyObject *, PyObject *, PyObject *);


static inline void
_PyThreadState_UpdateTracingState(PyThreadState *tstate)
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30 changes: 30 additions & 0 deletions Python/pystate.c
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Expand Up @@ -639,6 +639,36 @@ _Py_ReleaseGlobalObjectsState(PyThreadState *oldts)
}
}

PyObject *
_Py_AddToGlobalDict(PyObject *dict, PyObject *key, PyObject *value)
{
assert(dict != 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 *actual = PyDict_SetDefault(dict, key, value);
if (actual == NULL) {
/* Raising an exception from one interpreter in another
is problematic, so we clear it and let the caller deal
with the returned NULL. */
assert(PyErr_ExceptionMatches(PyExc_MemoryError));
PyErr_Clear();
}

/* Swap back, it it wasn't in the main interpreter already. */
if (oldts != NULL) {
_Py_ReleaseGlobalObjectsState(oldts);
}

// XXX Immortalize the key and value.

return actual;
}


/*************************************/
/* the per-interpreter runtime state */
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