From mboxrd@z Thu Jan 1 00:00:00 1970 Path: news.gmane.org!not-for-mail From: Eli Zaretskii Newsgroups: gmane.emacs.bugs Subject: bug#12450: Remove configure's --without-sync-input option. Date: Sun, 16 Sep 2012 08:55:14 +0300 Message-ID: <83k3vuse9p.fsf@gnu.org> References: <50543449.1070306@cs.ucla.edu> <83k3vvtyw0.fsf@gnu.org> <5054551A.1070207@cs.ucla.edu> Reply-To: Eli Zaretskii NNTP-Posting-Host: plane.gmane.org X-Trace: ger.gmane.org 1347774972 23854 80.91.229.3 (16 Sep 2012 05:56:12 GMT) X-Complaints-To: usenet@ger.gmane.org NNTP-Posting-Date: Sun, 16 Sep 2012 05:56:12 +0000 (UTC) Cc: lekktu@gmail.com, eggert@cs.ucla.edu, 12450@debbugs.gnu.org To: Stefan Monnier Original-X-From: bug-gnu-emacs-bounces+geb-bug-gnu-emacs=m.gmane.org@gnu.org Sun Sep 16 07:56:12 2012 Return-path: Envelope-to: geb-bug-gnu-emacs@m.gmane.org Original-Received: from lists.gnu.org ([208.118.235.17]) by plane.gmane.org with esmtp (Exim 4.69) (envelope-from ) id 1TD7pq-0003lu-Qu for geb-bug-gnu-emacs@m.gmane.org; Sun, 16 Sep 2012 07:56:02 +0200 Original-Received: from localhost ([::1]:34773 helo=lists.gnu.org) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1TD7pm-0007Ia-QG for geb-bug-gnu-emacs@m.gmane.org; Sun, 16 Sep 2012 01:55:58 -0400 Original-Received: from eggs.gnu.org ([208.118.235.92]:51018) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1TD7pk-0007IV-9d for bug-gnu-emacs@gnu.org; Sun, 16 Sep 2012 01:55:57 -0400 Original-Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1TD7pj-0007nf-B2 for bug-gnu-emacs@gnu.org; Sun, 16 Sep 2012 01:55:56 -0400 Original-Received: from debbugs.gnu.org ([140.186.70.43]:54954) by eggs.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1TD7pj-0007nb-67 for bug-gnu-emacs@gnu.org; Sun, 16 Sep 2012 01:55:55 -0400 Original-Received: from Debian-debbugs by debbugs.gnu.org with local (Exim 4.72) (envelope-from ) id 1TD7qn-0002KH-PL for bug-gnu-emacs@gnu.org; Sun, 16 Sep 2012 01:57:01 -0400 X-Loop: help-debbugs@gnu.org Resent-From: Eli Zaretskii Original-Sender: debbugs-submit-bounces@debbugs.gnu.org Resent-CC: bug-gnu-emacs@gnu.org Resent-Date: Sun, 16 Sep 2012 05:57:01 +0000 Resent-Message-ID: Resent-Sender: help-debbugs@gnu.org X-GNU-PR-Message: followup 12450 X-GNU-PR-Package: emacs X-GNU-PR-Keywords: Original-Received: via spool by 12450-submit@debbugs.gnu.org id=B12450.13477749848894 (code B ref 12450); Sun, 16 Sep 2012 05:57:01 +0000 Original-Received: (at 12450) by debbugs.gnu.org; 16 Sep 2012 05:56:24 +0000 Original-Received: from localhost ([127.0.0.1]:36267 helo=debbugs.gnu.org) by debbugs.gnu.org with esmtp (Exim 4.72) (envelope-from ) id 1TD7qC-0002JO-40 for submit@debbugs.gnu.org; Sun, 16 Sep 2012 01:56:24 -0400 Original-Received: from mtaout22.012.net.il ([80.179.55.172]:41096) by debbugs.gnu.org with esmtp (Exim 4.72) (envelope-from ) id 1TD7q8-0002JE-6k for 12450@debbugs.gnu.org; Sun, 16 Sep 2012 01:56:22 -0400 Original-Received: from conversion-daemon.a-mtaout22.012.net.il by a-mtaout22.012.net.il (HyperSendmail v2007.08) id <0MAF00A00HON9900@a-mtaout22.012.net.il> for 12450@debbugs.gnu.org; Sun, 16 Sep 2012 08:55:11 +0300 (IDT) Original-Received: from HOME-C4E4A596F7 ([87.69.4.28]) by a-mtaout22.012.net.il (HyperSendmail v2007.08) with ESMTPA id <0MAF00A7QHRZ8O20@a-mtaout22.012.net.il>; Sun, 16 Sep 2012 08:55:11 +0300 (IDT) In-reply-to: X-012-Sender: halo1@inter.net.il X-BeenThere: debbugs-submit@debbugs.gnu.org X-Mailman-Version: 2.1.13 Precedence: list X-detected-operating-system: by eggs.gnu.org: GNU/Linux 2.6 (newer, 2) X-Received-From: 140.186.70.43 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.org@gnu.org Original-Sender: bug-gnu-emacs-bounces+geb-bug-gnu-emacs=m.gmane.org@gnu.org Xref: news.gmane.org gmane.emacs.bugs:64387 Archived-At: > From: Stefan Monnier > Cc: Eli Zaretskii , lekktu@gmail.com, 12450@debbugs.gnu.org > Date: Sat, 15 Sep 2012 17:12:13 -0400 > > >> If someone can describe in detail what SYNC_INPUT means > > Maybe not quite, because it was implemented rather than designed. > But SYNC_INPUT's purpose is to reduce the code run during POSIX's signal > handling to its minimum (since it's basically unsafe to do anything in > there, due to POSIX's definition of signal handling), so it only sets > a global var (pending_signals) which is then polled by QUIT, so that the > real code reacting to the arrival of a signal is run synchronously. > > This avoids problems such as malloc being called in the middle of > another malloc invocation. > > The downside of SYNC_INPUT is that we may fail to poll pending_signals > often enough and hence become unresponsive. Since SYNC_INPUT has been > the default for a long while now, I think we can drop the non-SYNC_INPUT > case, indeed, as suggested by Paul. But I don't know how it interacts > with the non-X11 code. Could you please describe how the SYNC_INPUT code is supposed to work in the following situations: . keyboard input on a TTY that comes while Lisp is running . an X event that exposes an Emacs frame in a GUI session, coming while Lisp is running Thanks.