From mboxrd@z Thu Jan 1 00:00:00 1970 Path: news.gmane.io!.POSTED.blaine.gmane.org!not-for-mail From: Emanuel Berg via Users list for the GNU Emacs text editor Newsgroups: gmane.emacs.help Subject: Re: `max-specpdl-size' and `max-lisp-eval-depth' Date: Tue, 28 Sep 2021 13:05:15 +0200 Message-ID: <87fstpkljo.fsf@zoho.eu> References: <87ilyoukp2.fsf@zoho.eu> <20210926071351.GA10016@tuxteam.de> <83czovo5dh.fsf@gnu.org> <87k0j1t1mv.fsf@gmx.net> Reply-To: Emanuel Berg Mime-Version: 1.0 Content-Type: text/plain Injection-Info: ciao.gmane.io; posting-host="blaine.gmane.org:116.202.254.214"; logging-data="13967"; mail-complaints-to="usenet@ciao.gmane.io" User-Agent: Gnus/5.13 (Gnus v5.13) Emacs/28.0.50 (gnu/linux) To: help-gnu-emacs@gnu.org Cancel-Lock: sha1:xVyb/5gv5NS/N7QIxMf8tAYRSgE= Original-X-From: help-gnu-emacs-bounces+geh-help-gnu-emacs=m.gmane-mx.org@gnu.org Tue Sep 28 13:13:15 2021 Return-path: Envelope-to: geh-help-gnu-emacs@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 1mVB2w-0003NP-Vf for geh-help-gnu-emacs@m.gmane-mx.org; Tue, 28 Sep 2021 13:13:14 +0200 Original-Received: from localhost ([::1]:40646 helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1mVB2w-00027X-1i for geh-help-gnu-emacs@m.gmane-mx.org; Tue, 28 Sep 2021 07:13:14 -0400 Original-Received: from eggs.gnu.org ([2001:470:142:3::10]:38762) by lists.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1mVAvQ-00022T-5q for help-gnu-emacs@gnu.org; Tue, 28 Sep 2021 07:05:28 -0400 Original-Received: from ciao.gmane.io ([116.202.254.214]:34614) by eggs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1mVAvN-0005Sw-5h for help-gnu-emacs@gnu.org; Tue, 28 Sep 2021 07:05:27 -0400 Original-Received: from list by ciao.gmane.io with local (Exim 4.92) (envelope-from ) id 1mVAvL-0003Ay-PC for help-gnu-emacs@gnu.org; Tue, 28 Sep 2021 13:05:23 +0200 X-Injected-Via-Gmane: http://gmane.org/ Mail-Followup-To: help-gnu-emacs@gnu.org Mail-Copies-To: never Received-SPF: pass client-ip=116.202.254.214; envelope-from=geh-help-gnu-emacs@m.gmane-mx.org; helo=ciao.gmane.io X-Spam_score_int: -16 X-Spam_score: -1.7 X-Spam_bar: - X-Spam_report: (-1.7 / 5.0 requ) BAYES_00=-1.9, HEADER_FROM_DIFFERENT_DOMAINS=0.249, SPF_HELO_NONE=0.001, SPF_PASS=-0.001 autolearn=no autolearn_force=no X-Spam_action: no action X-BeenThere: help-gnu-emacs@gnu.org X-Mailman-Version: 2.1.23 Precedence: list List-Id: Users list for the GNU Emacs text editor List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: help-gnu-emacs-bounces+geh-help-gnu-emacs=m.gmane-mx.org@gnu.org Original-Sender: "help-gnu-emacs" Xref: news.gmane.io gmane.emacs.help:133339 Archived-At: Stephen Berman wrote: >> Thank you for your explanation. Only two built-in symbols >> in Emacs contain this string in their names - the other is >> `ar-max-specpdl-size'. > > The term goes back to the beginnings of Lisp (McCarthy's > paper from 1960, available via the Wayback Machine from > http://www-formal.stanford.edu/jmc/recursive/node4.html): > > In general (we shall discuss an exception), the routine > for a recursive function uses itself as a subroutine [...] > This possible conflict is resolved by the SAVE and UNSAVE > routines that use the public push-down list. > > A footnote here (added later) says: "1995: now called > a stack" Cool B) IIRC from Automata Theory there was this thing called a PDA or "pushdown automaton", maybe that was a stack as well? Later a PDA was a "Personal digital assistant" like the Apple Newton which didn't make anyone impressed. But I guess they made up for it at least commercially with all the later iThings ... -- underground experts united https://dataswamp.org/~incal