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gh-101659: Add _Py_AtExit() (gh-103298)

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The function is like Py_AtExit() but for a single interpreter.  This is a companion to the atexit module's register() function, taking a C callback instead of a Python one.

We also update the _xxinterpchannels module to use _Py_AtExit(), which is the motivating case.  (This is inspired by pain points felt while working on gh-101660.)
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Eric Snow 2023-04-05 18:42:02 -06:00 • committed by GitHub
parent 4ec8dd10bd
commit 03089fdccc
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13 changed files with 268 additions and 67 deletions
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11
Modules/_xxsubinterpretersmodule.c
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@ -67,16 +67,7 @@ _release_xid_data(_PyCrossInterpreterData *data, int ignoreexc)
}
int res = _PyCrossInterpreterData_Release(data);
if (res < 0) {
// XXX Fix this!
/* The owning interpreter is already destroyed.
* Ideally, this shouldn't ever happen. (It's highly unlikely.)
* For now we hack around that to resolve refleaks, by decref'ing
* the released object here, even if its the wrong interpreter.
* The owning interpreter has already been destroyed
* so we should be okay, especially since the currently
* shareable types are all very basic, with no GC.
* That said, it becomes much messier once interpreters
* no longer share a GIL, so this needs to be fixed before then. */
/* The owning interpreter is already destroyed. */
_PyCrossInterpreterData_Clear(NULL, data);
if (ignoreexc) {
// XXX Emit a warning?