From mboxrd@z Thu Jan 1 00:00:00 1970 Path: news.gmane.org!.POSTED.blaine.gmane.org!not-for-mail From: Eli Zaretskii Newsgroups: gmane.emacs.bugs Subject: bug#34821: discard_input_tty does not discard pending input, resulting in garbage inserted into the buffer Date: Sun, 07 Apr 2019 21:24:58 +0300 Message-ID: <83r2ad8yh1.fsf@gnu.org> References: <6e2317c9-5063-3718-740e-f53c70f5db5b@gmail.com> <83v9zp93gq.fsf@gnu.org> <492c723c-6ba9-24da-108f-b25cef0dd54e@gmail.com> Injection-Info: blaine.gmane.org; posting-host="blaine.gmane.org:195.159.176.226"; logging-data="89259"; mail-complaints-to="usenet@blaine.gmane.org" Cc: 34821@debbugs.gnu.org To: Platon Pronko Original-X-From: bug-gnu-emacs-bounces+geb-bug-gnu-emacs=m.gmane.org@gnu.org Sun Apr 07 20:26:13 2019 Return-path: Envelope-to: geb-bug-gnu-emacs@m.gmane.org Original-Received: from lists.gnu.org ([209.51.188.17]) by blaine.gmane.org with esmtps (TLS1.0:RSA_AES_256_CBC_SHA1:256) (Exim 4.89) (envelope-from ) id 1hDCUd-000N6b-Q9 for geb-bug-gnu-emacs@m.gmane.org; Sun, 07 Apr 2019 20:26:11 +0200 Original-Received: from localhost ([127.0.0.1]:42168 helo=lists.gnu.org) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1hDCUc-0005Rx-LD for geb-bug-gnu-emacs@m.gmane.org; Sun, 07 Apr 2019 14:26:10 -0400 Original-Received: from eggs.gnu.org ([209.51.188.92]:44571) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1hDCUW-0005Rg-Gv for bug-gnu-emacs@gnu.org; Sun, 07 Apr 2019 14:26:05 -0400 Original-Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1hDCUV-0007nt-LE for bug-gnu-emacs@gnu.org; Sun, 07 Apr 2019 14:26:04 -0400 Original-Received: from debbugs.gnu.org ([209.51.188.43]:35139) by eggs.gnu.org with esmtps (TLS1.0:RSA_AES_128_CBC_SHA1:16) (Exim 4.71) (envelope-from ) id 1hDCUV-0007nm-DQ for bug-gnu-emacs@gnu.org; Sun, 07 Apr 2019 14:26:03 -0400 Original-Received: from Debian-debbugs by debbugs.gnu.org with local (Exim 4.84_2) (envelope-from ) id 1hDCUU-000212-JA for bug-gnu-emacs@gnu.org; Sun, 07 Apr 2019 14:26:03 -0400 X-Loop: help-debbugs@gnu.org Resent-From: Eli Zaretskii Original-Sender: "Debbugs-submit" Resent-CC: bug-gnu-emacs@gnu.org Resent-Date: Sun, 07 Apr 2019 18:26:02 +0000 Resent-Message-ID: Resent-Sender: help-debbugs@gnu.org X-GNU-PR-Message: followup 34821 X-GNU-PR-Package: emacs Original-Received: via spool by 34821-submit@debbugs.gnu.org id=B34821.15546615167691 (code B ref 34821); Sun, 07 Apr 2019 18:26:02 +0000 Original-Received: (at 34821) by debbugs.gnu.org; 7 Apr 2019 18:25:16 +0000 Original-Received: from localhost ([127.0.0.1]:48683 helo=debbugs.gnu.org) by debbugs.gnu.org with esmtp (Exim 4.84_2) (envelope-from ) id 1hDCTk-0001zx-72 for submit@debbugs.gnu.org; Sun, 07 Apr 2019 14:25:16 -0400 Original-Received: from eggs.gnu.org ([209.51.188.92]:58260) by debbugs.gnu.org with esmtp (Exim 4.84_2) (envelope-from ) id 1hDCTi-0001zj-Cl for 34821@debbugs.gnu.org; Sun, 07 Apr 2019 14:25:14 -0400 Original-Received: from fencepost.gnu.org ([2001:470:142:3::e]:57832) by eggs.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1hDCTb-00075E-4n; Sun, 07 Apr 2019 14:25:08 -0400 Original-Received: from [176.228.60.248] (port=3422 helo=home-c4e4a596f7) by fencepost.gnu.org with esmtpsa (TLS1.2:RSA_AES_256_CBC_SHA1:256) (Exim 4.82) (envelope-from ) id 1hDCTY-0007wr-SB; Sun, 07 Apr 2019 14:25:06 -0400 In-reply-to: <492c723c-6ba9-24da-108f-b25cef0dd54e@gmail.com> (message from Platon Pronko on Sun, 7 Apr 2019 20:14:21 +0300) X-detected-operating-system: by eggs.gnu.org: GNU/Linux 2.2.x-3.x [generic] X-BeenThere: debbugs-submit@debbugs.gnu.org X-Mailman-Version: 2.1.18 Precedence: list X-detected-operating-system: by eggs.gnu.org: GNU/Linux 2.2.x-3.x [generic] X-Received-From: 209.51.188.43 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" Xref: news.gmane.org gmane.emacs.bugs:157319 Archived-At: > From: Platon Pronko > Date: Sun, 7 Apr 2019 20:14:21 +0300 > > I guess that something in (terminal-init-xterm) hooks results in some buffer switch event being fired, that triggers the second return from read_char(). But since (terminal-init-xterm) and read_key_sequence() run concurrently, we have a race condition - if the terminal responds quickly enough, second buffer switch does not trigger quick enough and this problem happens. What do you mean by "run concurrently"? Emacs is pretty much a single threaded program, and there's only one Lisp thread running at any given time, which will execute both calls. > Maybe trying to rely on terminal being slow with the response is not the best solution? Even if I find a cause of the buffer switch event, we won't have a way to ensure that it always arrives before the response to SDA query (because multithreading). You may be right, but my reasoning was that without knowing why there's a second buffer-switch event sometimes, we will be unable to devise a good solution. IOW, I think we need to understand the issue better before we are ready to discuss a solution.