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.bugs Subject: bug#44818: 27.0.91; wedged Date: Wed, 25 Nov 2020 17:06:02 +0200 Message-ID: <83v9dtsch1.fsf@gnu.org> References: <83a6v8vzok.fsf@gnu.org> <25e38edd-593d-5c6b-dd6d-25bb5cd439b3@jovi.net> <83ft4ytwu7.fsf@gnu.org> Injection-Info: ciao.gmane.io; posting-host="blaine.gmane.org:116.202.254.214"; logging-data="11170"; mail-complaints-to="usenet@ciao.gmane.io" Cc: 44818@debbugs.gnu.org To: Devon Sean McCullough Original-X-From: bug-gnu-emacs-bounces+geb-bug-gnu-emacs=m.gmane-mx.org@gnu.org Wed Nov 25 16:07:16 2020 Return-path: Envelope-to: geb-bug-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 1khwO4-0002oQ-HU for geb-bug-gnu-emacs@m.gmane-mx.org; Wed, 25 Nov 2020 16:07:16 +0100 Original-Received: from localhost ([::1]:34496 helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1khwO3-000649-J1 for geb-bug-gnu-emacs@m.gmane-mx.org; Wed, 25 Nov 2020 10:07:15 -0500 Original-Received: from eggs.gnu.org ([2001:470:142:3::10]:40324) by lists.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1khwNq-0005wT-SO for bug-gnu-emacs@gnu.org; Wed, 25 Nov 2020 10:07:03 -0500 Original-Received: from debbugs.gnu.org ([209.51.188.43]:53369) by eggs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_128_GCM_SHA256:128) (Exim 4.90_1) (envelope-from ) id 1khwNq-0003Ff-K2 for bug-gnu-emacs@gnu.org; Wed, 25 Nov 2020 10:07:02 -0500 Original-Received: from Debian-debbugs by debbugs.gnu.org with local (Exim 4.84_2) (envelope-from ) id 1khwNq-0000aJ-Cs for bug-gnu-emacs@gnu.org; Wed, 25 Nov 2020 10:07:02 -0500 X-Loop: help-debbugs@gnu.org Resent-From: Eli Zaretskii Original-Sender: "Debbugs-submit" Resent-CC: bug-gnu-emacs@gnu.org Resent-Date: Wed, 25 Nov 2020 15:07:02 +0000 Resent-Message-ID: Resent-Sender: help-debbugs@gnu.org X-GNU-PR-Message: followup 44818 X-GNU-PR-Package: emacs Original-Received: via spool by 44818-submit@debbugs.gnu.org id=B44818.16063167722187 (code B ref 44818); Wed, 25 Nov 2020 15:07:02 +0000 Original-Received: (at 44818) by debbugs.gnu.org; 25 Nov 2020 15:06:12 +0000 Original-Received: from localhost ([127.0.0.1]:36682 helo=debbugs.gnu.org) by debbugs.gnu.org with esmtp (Exim 4.84_2) (envelope-from ) id 1khwN2-0000ZD-AW for submit@debbugs.gnu.org; Wed, 25 Nov 2020 10:06:12 -0500 Original-Received: from eggs.gnu.org ([209.51.188.92]:50118) by debbugs.gnu.org with esmtp (Exim 4.84_2) (envelope-from ) id 1khwN0-0000Yu-1i for 44818@debbugs.gnu.org; Wed, 25 Nov 2020 10:06:10 -0500 Original-Received: from fencepost.gnu.org ([2001:470:142:3::e]:45751) by eggs.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1khwMu-0002y5-Jj; Wed, 25 Nov 2020 10:06:04 -0500 Original-Received: from [176.228.60.248] (port=1744 helo=home-c4e4a596f7) by fencepost.gnu.org with esmtpsa (TLS1.2:RSA_AES_256_CBC_SHA1:256) (Exim 4.82) (envelope-from ) id 1khwMq-00076J-MS; Wed, 25 Nov 2020 10:06:01 -0500 In-Reply-To: (message from Devon Sean McCullough on Tue, 24 Nov 2020 20:35:00 -0500) X-BeenThere: debbugs-submit@debbugs.gnu.org X-Mailman-Version: 2.1.18 Precedence: list X-BeenThere: bug-gnu-emacs@gnu.org List-Id: "Bug reports for GNU Emacs, the Swiss army knife of text editors" List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: bug-gnu-emacs-bounces+geb-bug-gnu-emacs=m.gmane-mx.org@gnu.org Original-Sender: "bug-gnu-emacs" Xref: news.gmane.io gmane.emacs.bugs:194199 Archived-At: > Cc: 44818@debbugs.gnu.org > From: Devon Sean McCullough > Date: Tue, 24 Nov 2020 20:35:00 -0500 > > On 24/11/2020 13:48, Eli Zaretskii wrote: > >> Cc: 44818@debbugs.gnu.org > >> From: Devon Sean McCullough > >> Date: Tue, 24 Nov 2020 13:42:03 -0500 > >> > >> P.S. Could a watchdog timer safely abort such wedgitude? > > > > That would have to run in a separate thread, right? > > > > But what timeout to set it to? some jobs might legitimately take some > > time. And then what to do when the timer expires? > > The job of redisplay cannot legitimately take > 50 milliseconds. It can, and it does. Although this is quite rare, it does happen. Here's a simple example: visit src/xdisp.c, then type M-> and measure the time. > When the user repeatedly tries ^G quit but Emacs is unresponsive > because of redisplay, such redisplay must be prevented while the > user is offered options to regain control. I asked "what to do when the timer expires" because the practical meaning of "redisplay must be prevented" is not at all clear. > P.S. Could an invisibility overlay offer temporary relief? > Perhaps a red screen of redisplay death with a short menu? Anything that has to be done by the display code will suffer from the same problem.