[Python-Dev] PEP 567 v3

[Guido van Rossum]

On Tue, Jan 16, 2018 at 4:37 PM, Antoine Pitrou <solipsis at pitrou.net> wrote:

> On Tue, 16 Jan 2018 17:44:14 -0500
> Yury Selivanov <yselivanov.ml at gmail.com> wrote:
>
> > Offloading execution to other threads
> > -------------------------------------
> >
> > It is possible to run code in a separate OS thread using a copy
> > of the current thread context::
> >
> >     executor = ThreadPoolExecutor()
> >     current_context = contextvars.copy_context()
> >
> >     executor.submit(
> >         lambda: current_context.run(some_function))
>
> Does it also support offloading to a separate process (using
> ProcessPoolExecutor in the example above)?  This would require the
> Context to support pickling.
>

I don't think that's a requirement. The transparency between the two
different types of executor is mostly misleading anyway -- it's like the
old RPC transparency problem, which was never solved IIRC. There are just
too many things you need to be aware of before you can successfully offload
something to a different process.

-- 
--Guido van Rossum (python.org/~guido)
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