On Tue, 21 Apr 2020 18:46:04 +0200 Petr Viktorin <encu...@gmail.com> wrote: > On 2020-04-21 11:01, Antoine Pitrou wrote: > > On Mon, 20 Apr 2020 19:21:21 -0600 > > Eric Snow <ericsnowcurren...@gmail.com> wrote: > >> Honest question: how many C extensions have process-global state that > >> will cause problems under subinterpreters? In other words, how many > >> already break in mod_wsgi? > > > > A slightly tricky question is what happens if a PyObject survives > > longer than the subinterpreter that created it. > > > > For example, in PyArrow, we allow passing a Python buffer-like object > > as a C++ buffer to C++ APIs. The C++ buffer could conceivably be kept > > around by C++ code for some time. When the C++ buffer is destroyed, > > Py_DECREF() is called on the Python object (I figure that we would have > > to switch to the future interpreter-aware PyGILState API -- when will > > it be available?). > > > > But what happens if the interpreter which created > > the Python object is already destroyed at this point? > > That's a good question. What happens today if someone calls Py_Finalize > while the buffer is still around? > > I don't think you need to treat *sub*interpreters specially.
The difference is that subinterpreters may have a shorter lifetime than the main interpreter. Also, we're currently using a global memory allocator, so simple operations may work until the process dies. Regards Antoine. _______________________________________________ Python-Dev mailing list -- python-dev@python.org To unsubscribe send an email to python-dev-le...@python.org https://mail.python.org/mailman3/lists/python-dev.python.org/ Message archived at https://mail.python.org/archives/list/python-dev@python.org/message/UWWO3RS3UOYCZXVFORGTJAEXXOCUQQXD/ Code of Conduct: http://python.org/psf/codeofconduct/
