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Re: Concurrency via isolated process/thread

From: Eli Zaretskii
Subject: Re: Concurrency via isolated process/thread
Date: Tue, 04 Jul 2023 20:35:16 +0300

> From: Ihor Radchenko <yantar92@posteo.net>
> Cc: emacs-devel@gnu.org
> Date: Tue, 04 Jul 2023 17:29:07 +0000
> > This is software: anything's possible ;-).  But Someoneā„¢ needs to
> > write the code, like marshalling and unmarshalling of such objects
> > between two processes.  (We do something like that when we write then
> > load the pdumper file.)  There's more than one way of skinning this
> > particular cat.
> As the first step, I wanted to hear if there is any blocker that
> prevents memcpy between processes without going through print/read.

I don't think you can design on this base.  Security and all that.
Also, complex structures include pointers and references, which you
cannot safely copy as-is anyway.

> >> The inter-process communication does not have to be asynchronous, but
> >> may work similar to the existing thread implementation.
> >
> > I wouldn't recommend designing anything by the example of Lisp
> > threads.  'Nough said.
> IMHO, the main problem with threads is that they cannot be interrupted
> or fire too frequently.

I wish this were the only problem with threads.

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