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

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In a few places we switch to another interpreter without knowing if it has a thread state associated with the current thread.  For the main interpreter there wasn't much of a problem, but for subinterpreters we were *mostly* okay re-using the tstate created with the interpreter (located via PyInterpreterState_ThreadHead()).  There was a good chance that tstate wasn't actually in use by another thread.

However, there are no guarantees of that.  Furthermore, re-using an already used tstate is currently fragile.  To address this, now we create a new thread state in each of those places and use it.

One consequence of this change is that PyInterpreterState_ThreadHead() may not return NULL (though that won't happen for the main interpreter).
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Eric Snow 2023-10-03 09:20:48 -06:00 • committed by GitHub
parent 4227bfa8b2
commit f5198b09e1
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8 changed files with 151 additions and 68 deletions
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5
Include/internal/pycore_pystate.h
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@ -48,6 +48,7 @@ _Py_IsMainInterpreterFinalizing(PyInterpreterState *interp)
PyAPI_FUNC(int) _PyInterpreterState_SetRunningMain(PyInterpreterState *);
PyAPI_FUNC(void) _PyInterpreterState_SetNotRunningMain(PyInterpreterState *);
PyAPI_FUNC(int) _PyInterpreterState_IsRunningMain(PyInterpreterState *);
PyAPI_FUNC(int) _PyInterpreterState_FailIfRunningMain(PyInterpreterState *);
static inline const PyConfig *
@ -139,7 +140,9 @@ static inline PyInterpreterState* _PyInterpreterState_GET(void) {
// PyThreadState functions
extern PyThreadState * _PyThreadState_New(PyInterpreterState *interp);
extern PyThreadState * _PyThreadState_New(
PyInterpreterState *interp,
int whence);
extern void _PyThreadState_Bind(PyThreadState *tstate);
extern void _PyThreadState_DeleteExcept(PyThreadState *tstate);