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gh-59956: Clarify GILState-related Code #101161

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Merged
ericsnowcurrently merged 11 commits into from
Jan 19, 2023
Merged

gh-59956: Clarify GILState-related Code #101161

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c35aee5
Add some TODO comments.
ericsnowcurrently Jan 18, 2023
bb86c59
Factor out "current_tss" helpers.
ericsnowcurrently Jan 18, 2023
5903b39
Inline the current_tss helpers.
ericsnowcurrently Jan 19, 2023
a5eb3d8
Factor out "current_fast" helpers.
ericsnowcurrently Jan 18, 2023
6281edb
Move tstate_current out of _PyRuntimeState.gilstate.
ericsnowcurrently Jan 18, 2023
2f8aaec
Do not use _PyThreadState_GET() in pystate.c.
ericsnowcurrently Jan 18, 2023
4af2ecb
Move autoTSSkey out of _PyRuntimeState.gilstate.
ericsnowcurrently Jan 19, 2023
7bdf5a4
Initialize autoTSSkey earlier.
ericsnowcurrently Jan 19, 2023
4b952e0
Factor out bind_tstate() and unbind_tstate().
ericsnowcurrently Jan 19, 2023
5e7283c
PyThreadState_IsCurrent() -> holds_gil().
ericsnowcurrently Jan 19, 2023
57bd92e
Do not set PyThreadState.thread_id to a negative value.
ericsnowcurrently Jan 19, 2023
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Factor out "current_tss" helpers.
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@ericsnowcurrently
ericsnowcurrently committed Jan 19, 2023
commit bb86c59af215f67c1e81b86872ae7f0701c1768a
2 changes: 1 addition & 1 deletion Include/internal/pycore_pystate.h
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Expand Up @@ -142,7 +142,7 @@ _PyThreadState_UpdateTracingState(PyThreadState *tstate)
/* Other */

PyAPI_FUNC(PyThreadState *) _PyThreadState_Swap(
struct _gilstate_runtime_state *gilstate,
_PyRuntimeState *runtime,
PyThreadState *newts);

PyAPI_FUNC(PyStatus) _PyInterpreterState_Enable(_PyRuntimeState *runtime);
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14 changes: 6 additions & 8 deletions Python/ceval_gil.c
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Expand Up @@ -581,8 +581,7 @@ PyEval_AcquireThread(PyThreadState *tstate)

take_gil(tstate);

struct _gilstate_runtime_state *gilstate = &tstate->interp->runtime->gilstate;
if (_PyThreadState_Swap(gilstate, tstate) != NULL) {
if (_PyThreadState_Swap(tstate->interp->runtime, tstate) != NULL) {
Py_FatalError("non-NULL old thread state");
}
}
Expand All @@ -593,7 +592,7 @@ PyEval_ReleaseThread(PyThreadState *tstate)
assert(is_tstate_valid(tstate));

_PyRuntimeState *runtime = tstate->interp->runtime;
PyThreadState *new_tstate = _PyThreadState_Swap(&runtime->gilstate, NULL);
PyThreadState *new_tstate = _PyThreadState_Swap(runtime, NULL);
if (new_tstate != tstate) {
Py_FatalError("wrong thread state");
}
Expand Down Expand Up @@ -643,7 +642,7 @@ PyThreadState *
PyEval_SaveThread(void)
{
_PyRuntimeState *runtime = &_PyRuntime;
PyThreadState *tstate = _PyThreadState_Swap(&runtime->gilstate, NULL);
PyThreadState *tstate = _PyThreadState_Swap(runtime, NULL);
_Py_EnsureTstateNotNULL(tstate);

struct _ceval_runtime_state *ceval = &runtime->ceval;
Expand All @@ -660,8 +659,7 @@ PyEval_RestoreThread(PyThreadState *tstate)

take_gil(tstate);

struct _gilstate_runtime_state *gilstate = &tstate->interp->runtime->gilstate;
_PyThreadState_Swap(gilstate, tstate);
_PyThreadState_Swap(tstate->interp->runtime, tstate);
}


Expand Down Expand Up @@ -965,7 +963,7 @@ _Py_HandlePending(PyThreadState *tstate)
/* GIL drop request */
if (_Py_atomic_load_relaxed_int32(&interp_ceval_state->gil_drop_request)) {
/* Give another thread a chance */
if (_PyThreadState_Swap(&runtime->gilstate, NULL) != tstate) {
if (_PyThreadState_Swap(runtime, NULL) != tstate) {
Py_FatalError("tstate mix-up");
}
drop_gil(ceval, interp_ceval_state, tstate);
Expand All @@ -974,7 +972,7 @@ _Py_HandlePending(PyThreadState *tstate)

take_gil(tstate);

if (_PyThreadState_Swap(&runtime->gilstate, tstate) != NULL) {
if (_PyThreadState_Swap(runtime, tstate) != NULL) {
Py_FatalError("orphan tstate");
}
}
Expand Down
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