From mboxrd@z Thu Jan 1 00:00:00 1970 Path: news.gmane.io!.POSTED.blaine.gmane.org!not-for-mail From: Eli Zaretskii Newsgroups: gmane.emacs.devel Subject: Re: Emacs design and architecture. How about copy-on-write? Date: Thu, 21 Sep 2023 16:49:23 +0300 Message-ID: <83sf778wm4.fsf@gnu.org> References: <835y46e8o9.fsf@gnu.org> <87zg1ixvnc.fsf@dataswamp.org> <87il86nxts.fsf@localhost> <87o7hyx8h2.fsf@dataswamp.org> <87o7hx88ry.fsf@localhost> <87a5thta90.fsf@yahoo.com> <87led1865h.fsf@localhost> <875y45t7yo.fsf@yahoo.com> <874jjprmq2.fsf@yahoo.com> <83a5tgc03s.fsf@gnu.org> <87zg1gqr8q.fsf@yahoo.com> <83msxg9eb9.fsf@gnu.org> <87msxgq8rn.fsf@yahoo.com> <83jzsk9c5l.fsf@gnu.org> <87msxf2abp.fsf@localhost> <83h6nnalu5.fsf@gnu.org> <87y1gzzvec.fsf@localhost> <838r8zadls.fsf@gnu.org> <87v8c3pt57.fsf@yahoo.com> <83y1gz8xjm.fsf@gnu.org> <87pm2bps2m.fsf@yahoo.com> Injection-Info: ciao.gmane.io; posting-host="blaine.gmane.org:116.202.254.214"; logging-data="33452"; mail-complaints-to="usenet@ciao.gmane.io" Cc: yantar92@posteo.net, emacs-devel@gnu.org To: Po Lu Original-X-From: emacs-devel-bounces+ged-emacs-devel=m.gmane-mx.org@gnu.org Thu Sep 21 15:50:01 2023 Return-path: Envelope-to: ged-emacs-devel@m.gmane-mx.org Original-Received: from lists.gnu.org ([209.51.188.17]) by ciao.gmane.io with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.92) (envelope-from ) id 1qjK47-0008UC-U9 for ged-emacs-devel@m.gmane-mx.org; Thu, 21 Sep 2023 15:49:59 +0200 Original-Received: from localhost ([::1] helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1qjK3S-00048c-Q8; Thu, 21 Sep 2023 09:49:18 -0400 Original-Received: from eggs.gnu.org ([2001:470:142:3::10]) by lists.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1qjK3R-00045A-2G for emacs-devel@gnu.org; Thu, 21 Sep 2023 09:49:17 -0400 Original-Received: from fencepost.gnu.org ([2001:470:142:3::e]) by eggs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1qjK3P-00048s-Pv; Thu, 21 Sep 2023 09:49:15 -0400 DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=gnu.org; s=fencepost-gnu-org; h=References:Subject:In-Reply-To:To:From:Date: mime-version; bh=eyXud3cltgTdQO+0qHgtUCW+m28cRjal7p+RkSUQOZI=; b=TquuQiPtr65l YLU6PwM9w+FGn0Jz5KRtcB3wuDUT/1IQhNuoxwpM/j8pHQxD52hOCh36EA2SmJT3SoWjdPN8jRhAp Zf1WS3/nct+/PLlH3dPes6sH7X5ge5oQJmT2gIrCGVYOOZBqTjL6zY76y8BMahNSssGp92or7I7f1 Pe4T6hJPlBgegVtWsctbQVG++5CoE+anNcl0jboordl2o9dNyFqNfsWn5A7tuFMl2y7QITDu3MbmT SlHnMphdQLi4PYL2FquZFiymWa3xOhASu8MMxEa68bBbbXq9+pEzs+OS9eLrmDOxanjJXvTB5flkh 6Uvrk7nhwH8ZoIGRmsuV1g==; In-Reply-To: <87pm2bps2m.fsf@yahoo.com> (message from Po Lu on Thu, 21 Sep 2023 21:35:29 +0800) X-BeenThere: emacs-devel@gnu.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: "Emacs development discussions." List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: emacs-devel-bounces+ged-emacs-devel=m.gmane-mx.org@gnu.org Original-Sender: emacs-devel-bounces+ged-emacs-devel=m.gmane-mx.org@gnu.org Xref: news.gmane.io gmane.emacs.devel:310913 Archived-At: > From: Po Lu > Cc: yantar92@posteo.net, emacs-devel@gnu.org > Date: Thu, 21 Sep 2023 21:35:29 +0800 > > Eli Zaretskii writes: > > > Then my question wasn't really answered yet. > > Ah, I now understand what you were asking. > > The variable's global value is modified and thereafter made available to > all other threads. If multiple threads perform coinciding alterations > to the same symbol's value, the machine bus reconciles the conflict by > selecting a single value. And when this happens to globals defined in C, is it handled in the same way? if not, why not?