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gh-103323: Get the "Current" Thread State from a Thread-Local Variable #103324

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Merged
merged 12 commits into from
Apr 24, 2023
Merged

gh-103323: Get the "Current" Thread State from a Thread-Local Variable #103324

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c4db85a
Add a thread_local macro.
ericsnowcurrently Jan 10, 2023
47a7094
tstate_current -> thread_local.
ericsnowcurrently Apr 6, 2023
cf22de1
Add _PyThraedState_GetCurrent().
ericsnowcurrently Apr 7, 2023
d4136d2
Add HAVE_THREAD_LOCAL.
ericsnowcurrently Apr 7, 2023
f8c6598
Support the faster approach, if available.
ericsnowcurrently Apr 7, 2023
9496df0
Do not fail if thread_local not supported.
ericsnowcurrently Apr 7, 2023
2c335a3
thread_local -> _Py_thread_local
ericsnowcurrently Apr 7, 2023
4af0ce7
Only define _Py_thread_local for the core runtime.
ericsnowcurrently Apr 7, 2023
3db4007
Fix pystate.c.
ericsnowcurrently Apr 7, 2023
d573053
Call _PyThreadState_GET() from _PyRuntimeState_GetThreadState().
ericsnowcurrently Apr 7, 2023
feb8ef5
Fix the error message.
ericsnowcurrently Apr 7, 2023
2332a2e
Add a NEWS entry.
ericsnowcurrently Apr 7, 2023
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Call _PyThreadState_GET() from _PyRuntimeState_GetThreadState().
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@ericsnowcurrently
ericsnowcurrently committed Apr 7, 2023
commit d57305336a00b68563b59ac6dfdd424f18e2a998
22 changes: 11 additions & 11 deletions Include/internal/pycore_pystate.h
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Original file line number Diff line number Diff line change
Expand Up @@ -69,8 +69,15 @@ extern _Py_thread_local PyThreadState *_Py_tss_tstate;
#endif
PyAPI_DATA(PyThreadState *) _PyThreadState_GetCurrent(void);
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What is the use case for this new _PyThreadState_GetCurrent() function? There is already PyThreadState_Get(). How is it different?

The API to get the current thread state is already complicated and has a complicated history: https://pythondev.readthedocs.io/pystate.html

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It's there because I couldn't find a way to mix PyAPI_DATA with _Py_thread_local. Looks like that's the same issue you ran into in 2020.


/* Get the current Python thread state.

This function is unsafe: it does not check for error and it can return NULL.

The caller must hold the GIL.

See also PyThreadState_Get() and _PyThreadState_UncheckedGet(). */
static inline PyThreadState*
_PyRuntimeState_GetThreadState(_PyRuntimeState *runtime)
_PyThreadState_GET(void)
{
#if defined(HAVE_THREAD_LOCAL) && !defined(Py_BUILD_CORE_MODULE)
return _Py_tss_tstate;
Expand All @@ -79,20 +86,13 @@ _PyRuntimeState_GetThreadState(_PyRuntimeState *runtime)
#endif
}


/* Get the current Python thread state.

This function is unsafe: it does not check for error and it can return NULL.

The caller must hold the GIL.

See also PyThreadState_Get() and _PyThreadState_UncheckedGet(). */
static inline PyThreadState*
_PyThreadState_GET(void)
_PyRuntimeState_GetThreadState(_PyRuntimeState *Py_UNUSED(runtime))
{
return _PyRuntimeState_GetThreadState(&_PyRuntime);
return _PyThreadState_GET();
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This function no longer makes sense: I wrote PR #104171 to remove it.

}


static inline void
_Py_EnsureFuncTstateNotNULL(const char *func, PyThreadState *tstate)
{
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