8000 gh-109860: Use a New Thread State When Switching Interpreters, When Necessary by ericsnowcurrently · Pull Request #110245 · python/cpython · GitHub
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gh-109860: Use a New Thread State When Switching Interpreters, When Necessary #110245

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Merged
merged 13 commits into from
Oct 3, 2023
Merged

gh-109860: Use a New Thread State When Switching Interpreters, When Necessary #110245

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2117772
Add PyThreadState._whence.
ericsnowcurrently Sep 25, 2023
23828a3
Add an assert.
ericsnowcurrently Sep 25, 2023
b807906
Set up interp->_initial_thread for re-use.
ericsnowcurrently Sep 25, 2023
3e10a5c
Use a local PyThreadState in _PyInterpreterState_IDDecref().
ericsnowcurrently Sep 25, 2023
15e978a
Use a local PyThreadState in _xxsubinterpreters.
ericsnowcurrently Sep 26, 2023
0b60d6d
Throw away the initial thread state.
ericsnowcurrently Sep 26, 2023
781cb53
Use existing API.
ericsnowcurrently Sep 27, 2023
cd288b5
Release threading._main_thread._tstate_lock in _PyInterpreterState_Se…
ericsnowcurrently Sep 27, 2023
4afdf7b
Drop an assert (fork is messy).
ericsnowcurrently Sep 27, 2023
aba79e3
Add _PyInterpreterState_FailIfRunningMain().
ericsnowcurrently Sep 27, 2023
2c18554
Propagate "alraedy running" properly.
ericsnowcurrently Sep 27, 2023
845c2bd
Fix handling of no-memory in _sharedexception_bind().
ericsnowcurrently Sep 27, 2023
fec49b2
Fix some typos.
ericsnowcurrently Oct 2, 2023
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Use a local PyThreadState in _PyInterpreterState_IDDecref().
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@ericsnowcurrently
ericsnowcurrently committed Oct 2, 2023
commit 3e10a5c08d84277ccbbf9b960bbac7962b8c129e
41 changes: 37 additions & 4 deletions Python/pystate.c
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Original file line number Diff line number Diff line change
Expand Up @@ -1170,6 +1170,10 @@ _PyInterpreterState_IDIncref(PyInterpreterState *interp)
}


static void PyThreadState_Init(PyThreadState *tstate,
PyInterpreterState *interp, int whence);
static void PyThreadState_Fini(PyThreadState *tstate);

void
_PyInterpreterState_IDDecref(PyInterpreterState *interp)
{
Expand All @@ -1183,11 +1187,13 @@ _PyInterpreterState_IDDecref(PyInterpreterState *interp)
PyThread_release_lock(interp->id_mutex);

if (refcount == 0 && interp->requires_idref) {
// XXX Using the "head" thread isn't strictly correct.
PyThreadState *tstate = PyInterpreterState_ThreadHead(interp);
PyThreadState tstate;
PyThreadState_Init(&tstate, interp, _PyThreadState_WHENCE_INTERP);
_PyThreadState_Bind(&tstate);

// XXX Possible GILState issues?
PyThreadState *save_tstate = _PyThreadState_Swap(runtime, tstate);
Py_EndInterpreter(tstate);
PyThreadState *save_tstate = _PyThreadState_Swap(runtime, &tstate);
Py_EndInterpreter(&tstate);
_PyThreadState_Swap(runtime, save_tstate);
}
}
Expand Down Expand Up @@ -1727,6 +1733,33 @@ _PyThreadState_DeleteExcept(PyThreadState *tstate)
}
}

static void
PyThreadState_Init(PyThreadState *tstate,
PyInterpreterState *interp, int whence)
{
HEAD_LOCK(interp->runtime);

interp->threads.next_unique_id += 1;
uint64_t id = interp->threads.next_unique_id;

// Set to _PyThreadState_INIT.
memcpy(tstate,
&initial._main_interpreter._initial_thread,
sizeof(*tstate));

init_threadstate(tstate, interp, id, whence);
add_threadstate(interp, tstate, interp->threads.head);

HEAD_UNLOCK(interp->runtime);
}

static void
PyThreadState_Fini(PyThreadState *tstate)
{
PyThreadState_Clear(tstate);
tstate_delete_common(tstate);
}


//----------
// accessors
Expand Down
0