8000 gh-100227: Make the Global Interned Dict Safe for Isolated Interpreters by ericsnowcurrently · Pull Request #102925 · python/cpython · GitHub
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gh-100227: Make the Global Interned Dict Safe for Isolated Interpreters #102925

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Merged
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 8000
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_AcquireGlobalObjectsState() and _Py_ReleaseGlobalObjectsState().
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@ericsnowcurrently
ericsnowcurrently committed Mar 22, 2023
commit 3b1bb8bd677630e3f905896bb84a5fa2e0cb616b
3 changes: 3 additions & 0 deletions Include/internal/pycore_pystate.h
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Expand Up @@ -130,6 +130,9 @@ PyAPI_FUNC(void) _PyThreadState_DeleteExcept(PyThreadState *tstate);
extern void _PyThreadState_InitDetached(PyThreadState *, PyInterpreterState *);
extern void _PyThreadState_ClearDetached(PyThreadState *);

extern PyThreadState * _Py_AcquireGlobalObjectsState(PyInterpreterState *);
extern void _Py_ReleaseGlobalObjectsState(PyThreadState *);


static inline void
_PyThreadState_UpdateTracingState(PyThreadState *tstate)
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75 changes: 75 additions & 0 deletions Python/pystate.c
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Expand Up @@ -565,6 +565,81 @@ _PyRuntimeState_ReInitThreads(_PyRuntimeState *runtime)
#endif


//---------------
// global objects
//---------------

static PyThreadState *
bind_global_objects_state(_PyRuntimeState *runtime)
{
PyThreadState *main_tstate = &runtime->cached_objects.main_tstate;

bind_tstate(main_tstate);
/* Unlike _PyThreadState_Bind(), we do not modify gilstate TSS. */

return main_tstate;
}

static void
unbind_global_objects_state(_PyRuntimeState *runtime)
{
PyThreadState *main_tstate = &runtime->cached_objects.main_tstate;
assert(tstate_is_alive(main_tstate));
assert(!main_tstate->_status.active);
assert(gilstate_tss_get(runtime) != main_tstate);

unbind_tstate(main_tstate);

/* This thread state may be bound/unbound repeatedly,
so we must erase evidence that it was ever bound (or unbound). */
main_tstate->_status.bound = 0;
main_tstate->_status.unbound = 0;

/* We must fully unlink the thread state from any OS thread,
to allow it to be bound more than once. */
main_tstate->thread_id = 0;
#ifdef PY_HAVE_THREAD_NATIVE_ID
main_tstate->native_thread_id = 0;
#endif
}

PyThreadState *
_Py_AcquireGlobalObjectsState(PyInterpreterState *interp)
{
_PyRuntimeState *runtime = &_PyRuntime;
assert(interp != NULL);
assert(interp->runtime == runtime);

PyThreadState *oldts = NULL;
/* All global objects are owned by the main interpreter. */
if (!_Py_IsMainInterpreter(interp)) {
PyThreadState *main_tstate = bind_global_objects_state(runtime);

oldts = _PyThreadState_Swap(runtime, main_tstate);
assert(oldts != NULL);

unbind_global_objects_state(runtime);
}

return oldts;
}

void
_Py_ReleaseGlobalObjectsState(PyThreadState *oldts)
{
if (oldts != NULL) {
/* The thread state was swapped in _Py_AcquireGlobalObjectsState(),
because the main interpreter wasn't running in the OS thread.. */
_PyRuntimeState *runtime = &_PyRuntime;
assert(oldts->interp->runtime == runtime);
assert(!_Py_IsMainInterpreter(oldts->interp));

// The returned tstate should be _PyRuntime.cached_objects.main_tstate.
_PyThreadState_Swap(runtime, oldts);
}
}


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