From mboxrd@z Thu Jan 1 00:00:00 1970 Path: news.gmane.io!.POSTED.blaine.gmane.org!not-for-mail From: Richard Stallman Newsgroups: gmane.emacs.devel Subject: Re: save-excursion and multi-thread? Date: Fri, 01 Oct 2021 18:32:48 -0400 Message-ID: References: <5713E898-28B8-456C-992C-F0332FACA9FF@mit.edu> <8335prnqtq.fsf@gnu.org> <57C38454-3A17-47CC-A820-C7E63D8C2BBB@mit.edu> <83y27jmam8.fsf@gnu.org> <8DD13632-54F3-4FC4-8789-C2275820FA94@mit.edu> <83r1dbm9kc.fsf@gnu.org> <6FB8B808-3423-48A1-8B0F-8E106DEB9C56@mit.edu> <83o88fm8zb.fsf@gnu.org> <875yuk88fo.fsf@dick> Reply-To: rms@gnu.org Content-Type: text/plain; charset=Utf-8 Injection-Info: ciao.gmane.io; posting-host="blaine.gmane.org:116.202.254.214"; logging-data="37292"; mail-complaints-to="usenet@ciao.gmane.io" Cc: emacs-devel@gnu.org To: dick Original-X-From: emacs-devel-bounces+ged-emacs-devel=m.gmane-mx.org@gnu.org Sat Oct 02 00:33:46 2021 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 1mWR6A-0009X7-JM for ged-emacs-devel@m.gmane-mx.org; Sat, 02 Oct 2021 00:33:46 +0200 Original-Received: from localhost ([::1]:36492 helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1mWR69-0004Ll-92 for ged-emacs-devel@m.gmane-mx.org; Fri, 01 Oct 2021 18:33:45 -0400 Original-Received: from eggs.gnu.org ([2001:470:142:3::10]:34390) by lists.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1mWR5G-0002yv-3n for emacs-devel@gnu.org; Fri, 01 Oct 2021 18:32:50 -0400 Original-Received: from fencepost.gnu.org ([2001:470:142:3::e]:33564) by eggs.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1mWR5F-0008Ak-RD; Fri, 01 Oct 2021 18:32:49 -0400 Original-Received: from rms by fencepost.gnu.org with local (Exim 4.90_1) (envelope-from ) id 1mWR5E-0005Bn-5p; Fri, 01 Oct 2021 18:32:48 -0400 In-Reply-To: <875yuk88fo.fsf@dick> (message from dick on Tue, 28 Sep 2021 21:41:31 -0400) X-BeenThere: emacs-devel@gnu.org X-Mailman-Version: 2.1.23 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" Xref: news.gmane.io gmane.emacs.devel:276014 Archived-At: [[[ To any NSA and FBI agents reading my email: please consider ]]] [[[ whether defending the US Constitution against all enemies, ]]] [[[ foreign or domestic, requires you to follow Snowden's example. ]]] > RS> [Having point behave like a special variable] does not necessarily require > RS> changing the way point is implemented at low level. > EZ was quite clear that point does not live in lisp-space, and thus cannot > leverage the BLV (buffer-local-value) machinery of data.c (which I might add > is broken under threads, bug#48990). That's true, but I doubt it is an obstacle. The specpdl mechanism has room for other specialized ways of swapping values in and out. -- Dr Richard Stallman (https://stallman.org) Chief GNUisance of the GNU Project (https://gnu.org) Founder, Free Software Foundation (https://fsf.org) Internet Hall-of-Famer (https://internethalloffame.org)