From: Manuel Giraud via "Emacs development discussions." <emacs-devel@gnu.org>
To: emacs-devel@gnu.org
Subject: Async message-send
Date: Wed, 07 Feb 2024 11:42:21 +0100 [thread overview]
Message-ID: <874jekv9ma.fsf@ledu-giraud.fr> (raw)
Hi,
I'm (again) trying to make an async version of 'message-send'. Reading
the elisp manual, I found that maybe I could use a "condition variable"
to make the communication between a sender thread and a house-keeping
thread. Here is a working example of what I had in mind:
--8<---------------cut here---------------start------------->8---
;;; -*- lexical-binding:t -*-
;;; Toy example with thread and condition variable
(defvar done-workers nil)
(defun worker (mutex cv token)
`(lambda ()
(if (zerop (mod (random 100) 2))
;; Error case: notify without adding me to the done-workers
;; list.
(with-mutex ,mutex
(condition-notify ,cv))
(with-current-buffer (get-buffer-create "foobar")
(insert "I'm done… ")
(with-mutex ,mutex
(push ,token done-workers)
(condition-notify ,cv))))))
(defun house-keeper (mutex cv token)
`(lambda ()
(with-mutex ,mutex
(condition-wait ,cv)
(cond ((member ,token done-workers)
(with-current-buffer (get-buffer-create "foobar")
(insert "okay\n"))
(setq done-workers (remove ,token done-workers)))
(t (message "There was an error"))))))
(defun +my-command ()
(interactive)
(let* ((mutex (make-mutex))
(cv (make-condition-variable mutex))
(token (random 100)))
(make-thread (worker mutex cv token))
(make-thread (house-keeper mutex cv token))))
--8<---------------cut here---------------end--------------->8---
Before trying to apply this pattern to 'message-send', do you think this
approach could have any flaws? Thanks.
--
Manuel Giraud
reply other threads:[~2024-02-07 10:42 UTC|newest]
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