A completely pre-emptive time sharing system for GNU Emacs

A completely pre-emptive time sharing system for GNU Emacs

[Davin Pearson]

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I posted the following message to google groups (gnu.emacs.help) but I got
no reply.  Then I emailed Richard Stallman this message and he suggested
that I send it to the following email address:

<snip>

Michael Abraham Shulman has written a coroutine feature for
Emacs at the following location.

https://www.emacswiki.org/emacs/coroutine.el

I am about to write a completely pre-emptive time-sharing system
but first I need to know if I will be re-inventing the wheel.

I hope my contribution to GNU Emacs is helpful for all the
programmers out there who agonize over GNUS busy waiting all the
time.

</snip>

-- 
Sincerely and kindest regards, Davin.
Davin Pearson    http://davin.50webs.com

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Re: A completely pre-emptive time sharing system for GNU Emacs

[John Wiegley]

>>>>> "DP" == Davin Pearson <davin.pearson@gmail.com> writes:

DP> I am about to write a completely pre-emptive time-sharing system but first
DP> I need to know if I will be re-inventing the wheel.

Hi Davin,

Will this be a C extension of Emacs core?

What are your intentions for the project? What needs do you see it fulfilling?

Yours,
-- 
John Wiegley                  GPG fingerprint = 4710 CF98 AF9B 327B B80F
http://newartisans.com                          60E1 46C4 BD1A 7AC1 4BA2

Re: A completely pre-emptive time sharing system for GNU Emacs

[Davin Pearson]

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On Wed, 6 Feb 2019 at 19:18, John Wiegley <johnw@gnu.org> wrote:

> >>>>> "DP" == Davin Pearson <davin.pearson@gmail.com> writes:
>
> DP> I am about to write a completely pre-emptive time-sharing system but
> first
> DP> I need to know if I will be re-inventing the wheel.
>
> Hi Davin,
>
> Will this be a C extension of Emacs core?
>
>
I plan to write the extension in Elisp.


> What are your intentions for the project? What needs do you see it
> fulfilling?
>
>
Anyone who wants Java style threads in their Elisp programs.

Basically, my idea is this:  Suppose you have the following Elisp code:

(defun code ()
   (setq abc 'def)
   (setq def 'ghi))

My mult-threader then generates the following code.

(defun foo-1 ()
   (setq abc 'def)
)

(defun foo-2 ()
  (setq def 'ghi))

Obviously the code gets difficult when you have if/while  constructs.

-- 
Sincerely and kindest regards, Davin.
Davin Pearson    http://davin.50webs.com

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Re: A completely pre-emptive time sharing system for GNU Emacs

[Tom Tromey]

>>>>> "Davin" == Davin Pearson <davin.pearson@gmail.com> writes:

Davin> Michael Abraham Shulman has written a coroutine feature for
Davin> Emacs at the following location.
Davin> https://www.emacswiki.org/emacs/coroutine.el

In a similar vein, there's also generator.el in the Emacs source tree.

Tom

Re: A completely pre-emptive time sharing system for GNU Emacs

[Eli Zaretskii]

> From: Davin Pearson <davin.pearson@gmail.com>
> Date: Thu, 7 Feb 2019 03:33:23 +1300
> 
> Michael Abraham Shulman has written a coroutine feature for
> Emacs at the following location.
> 
> https://www.emacswiki.org/emacs/coroutine.el

I believe the concurrency feature present in Emacs 26 is a better
solution for the same class of problems.