From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from forward501o.mail.yandex.net (forward501o.mail.yandex.net [IPv6:2a02:6b8:0:1a2d::611]) by sourceware.org (Postfix) with ESMTPS id D77E33858D35 for ; Wed, 10 Nov 2021 23:20:04 +0000 (GMT) DMARC-Filter: OpenDMARC Filter v1.4.1 sourceware.org D77E33858D35 Received: from sas1-df919fd4523f.qloud-c.yandex.net (sas1-df919fd4523f.qloud-c.yandex.net [IPv6:2a02:6b8:c14:4495:0:640:df91:9fd4]) by forward501o.mail.yandex.net (Yandex) with ESMTP id BB59045C52A8; Thu, 11 Nov 2021 02:20:02 +0300 (MSK) Received: from sas2-1cbd504aaa99.qloud-c.yandex.net (sas2-1cbd504aaa99.qloud-c.yandex.net [2a02:6b8:c14:7101:0:640:1cbd:504a]) by sas1-df919fd4523f.qloud-c.yandex.net (mxback/Yandex) with ESMTP id xaIW284WWT-K2CCu9UZ; Thu, 11 Nov 2021 02:20:02 +0300 Received: by sas2-1cbd504aaa99.qloud-c.yandex.net (smtp/Yandex) with ESMTPS id 19wPeE4e4b-K1wGUm48; Thu, 11 Nov 2021 02:20:01 +0300 (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (Client certificate not present) X-Yandex-Fwd: 2 Received: from [192.168.1.10] (HELO daemon2.darkdragon.lan) by daemon2 (Office Mail Server 0.8.12 build 08053101) with SMTP; Wed, 10 Nov 2021 23:07:06 -0000 Date: Thu, 11 Nov 2021 02:07:06 +0300 From: Andrey Repin X-Mailer: The Bat! (v6.8.8) Home Reply-To: cygwin@cygwin.com X-Priority: 3 (Normal) Message-ID: <1353673287.20211111020706@yandex.ru> To: "Henry S. Thompson" , cygwin@cygwin.com Subject: Re: Another pipe-related problem? In-Reply-To: References: <05c4180e-396b-4af3-ac0c-2ab8125df17e@cornell.edu> <0971ace1-5ee8-bdcc-5fd9-4551b294ebf8@cornell.edu> <75197fd0-d5da-3236-a7df-b8ffc3f67da7@cornell.edu> <4b937b32-e348-19d2-2406-c55fa12e20a3@cornell.edu> <83df50b8-5c0c-41b9-1e9e-4ea6bfa3d69f@cornell.edu> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Transfer-Encoding: 7bit X-Spam-Status: No, score=-1.5 required=5.0 tests=BAYES_00, DKIM_SIGNED, DKIM_VALID, DKIM_VALID_AU, DKIM_VALID_EF, FREEMAIL_FROM, KAM_THEBAT, NICE_REPLY_A, SPF_HELO_NONE, SPF_PASS, TXREP autolearn=ham autolearn_force=no version=3.4.4 X-Spam-Checker-Version: SpamAssassin 3.4.4 (2020-01-24) on server2.sourceware.org X-BeenThere: cygwin@cygwin.com X-Mailman-Version: 2.1.29 Precedence: list List-Id: General Cygwin discussions and problem reports List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Wed, 10 Nov 2021 23:20:07 -0000 Greetings, Henry S. Thompson! >> ... >> The main change was that we stopped using Win32 Overlapped I/O >> (https://docs.microsoft.com/en-us/windows/win32/sync/synchronization-and-overlapped-input-and-output) >> and switched to using the NT API. As a result, pipe I/O became much >> more efficient. It wouldn't surprise me if the efficiency alone is >> what exposed the bug. >> >> The good news is that the bug doesn't seem to occur in XEmacs 21.4 >> (on 32-bit Cygwin). So one way to approach this would be to bisect >> the XEmacs git repo to find the commit that introduced the bug. >> You'd probably have to do the work on 32-bit Cygwin since, if I >> remember correctly, XEmacs 21.4 didn't build on 64-bit Cygwin. > Right, although I _suspect_ it will be in 64-bit-only code. Easy > enough to find out, once I resurrect a 32-bit install on a spare > machine that I can run 3.3 on (I use XEmacs all day every day from my > day job, so I need to stay with 3.2 until we fix this). > So, this may take a while, unless someone else hits the problem and > finds a simpler test case. You can install as many Cygwin setups as you need on the same machine. They are not stepping on each other toes. Though I strongly require a virtual machine for such exercises. -- With best regards, Andrey Repin Thursday, November 11, 2021 2:06:01 Sorry for my terrible english...