On Tue, Apr 21, 2020 at 4:11 AM Greg Ewing <greg.ew...@canterbury.ac.nz> wrote:
> On 21/04/20 8:34 pm, Ronald Oussoren via Python-Dev wrote:
> > As far as I understand proper support for subinterpreters also requires
> > moving away from static type definition to avoid sharing objects > between 
> > interpreters (that is, use the PyType_FromSpec to build types).
>
> Which means updating every extension module that defines its
> own Python types and was written before PyType_FromSpec existed.
> I expect there is a huge number of those.

Correct.  Before we make the GIL per-interpreter, we will need to find
a solution for things like static types which minimizes the impact on
extension authors.  Note that PyType_FromSpec does not have to be
involved.  It is part of the Stable ABI effort in PEP 384, though it
does help with subinterpreters.  I expect there are other solutions
which will not involve as much churn, though I know folks who would
want everyone to use heap types regardless. :)

-eric
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