X-Recipient: archive-cygwin AT delorie DOT com DKIM-Filter: OpenDKIM Filter v2.11.0 sourceware.org 5472D385E024 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=cygwin.com; s=default; t=1585320823; bh=2QjgmKIK2pVv63qJngXIxEd36wUKE5izMqBiOXKiA9Y=; h=To:References:In-Reply-To:Subject:Date:List-Id:List-Unsubscribe: List-Archive:List-Post:List-Help:List-Subscribe:From:Reply-To:Cc: From; b=KxwXaHwHl45yX1icKHqhyOc+/pSfCpKM23BfQcO9dHsC9l+GHv5Tvmr8yeKhePtbQ 9BHTZbJePcsj7j8WCiBwB9v/wGku/vmi1QZaR9IuodSAcg4vRanNb1CNBe6Uq3fXwY D0Azvf0nRRhC6aONb2IikApjkVJ0yYncqF08iGdw= X-Original-To: cygwin AT cygwin DOT com Delivered-To: cygwin AT cygwin DOT com DMARC-Filter: OpenDMARC Filter v1.3.2 sourceware.org 876F4385E006 X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:from:to:cc:references:in-reply-to:subject:date :message-id:mime-version:thread-index:content-language; bh=A1xKxVrmbo4Jonss95j3/bchuYMNecqe1JIXdLWGNYU=; b=T/4Y2BkxB5chHsTaPBjiQ0JAc2dnHoxKiqNPuyVWmZfeMr8VoCvR7x6ctY6nfVP/Tg LIgrypfRh1V8GfaAj6o5qpzRnaG+jgMDqEou1j7j9u1XMiO/3Kd3N7WYY79/ubVC6Jgg vTG3Dxj9xjJg4zOL1WRe2srntBc1fD1Lftugn5+JvBcfqyySKcX8zHlTjal7wxc9Ogrl uZQDmnJlaDUwKo1nmne9199HXENpHcUEWzNiqvHblnw4nhFXEIXowV5S1yQ01sUEVVfa 2lI6BWzw+Ax3UNoFRyxgqc4zt5WShfnRykme6xgUYuwggUi1vmKKQ85QO7YoSsF0p70Z zOmQ== X-Gm-Message-State: ANhLgQ1fRu0nbe9tf3NHAj/APFHeEu6I8OdI1pTtFYHlh/MkrWqX0rKV 30TAY/34jAiZHL96q3cq9fCoUyMj X-Google-Smtp-Source: ADFU+vtbcZfDGY2Kg0HaP8MKlC5NKTu6I7ew4c0DLQiGcWiunqgp/NXxepX8JYa58TtwC7/ksDLQwQ== X-Received: by 2002:a05:651c:390:: with SMTP id e16mr8318351ljp.142.1585320817908; Fri, 27 Mar 2020 07:53:37 -0700 (PDT) To: "'Ken Brown'" References: <1b1401d60296$2769e690$763db3b0$@gmail.com> <716e2076-f607-454e-2723-937c3959e2a3 AT cornell DOT edu> <18be01d602ab$0bbfca30$233f5e90$@gmail.com> <35b43b59-6410-f21f-710c-385e39cbae0b AT cornell DOT edu> <005201d603ba$2bc8ab20$835a0160$@gmail.com> <472d1df6-531a-ebd7-4ffa-583a06e270ff AT cornell DOT edu> In-Reply-To: Subject: Sv: Sv: Sv: Named pipes and multiple writers Date: Fri, 27 Mar 2020 15:53:36 +0100 Message-ID: <00b901d60447$7ecb4c50$7c61e4f0$@gmail.com> MIME-Version: 1.0 Content-Type: multipart/mixed; boundary="----=_NextPart_000_00BA_01D6044F.E08FDB60" X-Mailer: Microsoft Outlook 16.0 Thread-Index: AQJE9fQg8TMZuJRGwTEKbo0ZGNgDeQHtMggPA01jw/MCH/KUAAKPevBvAf/qW+kC4eksHQHeBGSzpvlSQYA= Content-Language: en-gb X-Spam-Status: No, score=-1.9 required=5.0 tests=BAYES_00, DKIM_SIGNED, DKIM_VALID, DKIM_VALID_AU, DKIM_VALID_EF, FREEMAIL_FROM, RCVD_IN_DNSWL_NONE, SPF_HELO_NONE, SPF_PASS, TXREP autolearn=ham autolearn_force=no version=3.4.2 X-Spam-Checker-Version: SpamAssassin 3.4.2 (2018-09-13) on server2.sourceware.org X-BeenThere: cygwin AT cygwin DOT com X-Mailman-Version: 2.1.29 List-Id: General Cygwin discussions and problem reports List-Archive: List-Post: List-Help: List-Subscribe: , From: Kristian Ivarsson via Cygwin Reply-To: sten DOT kristian DOT ivarsson AT gmail DOT com Cc: "'cygwin'" Sender: "Cygwin" This is a multipart message in MIME format. ------=_NextPart_000_00BA_01D6044F.E08FDB60 Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable >On 3/26/2020 7:19 PM, Ken Brown via Cygwin wrote: >> On 3/26/2020 6:39 PM, Ken Brown via Cygwin wrote: >>> On 3/26/2020 6:01 PM, sten DOT kristian DOT ivarsson AT gmail DOT com wrote: >>>> The ENIXIO occurs when parallel child-processes simultaneously = using=20 >>>> O_NONBLOCK opening the descriptor. >>> >>> This is consistent with my guess that the error is generated by=20 >>> fhandler_fifo::wait.=A0 I have a feeling that read_ready should have = >>> been created as a manual-reset event, and that more care is needed = to=20 >>> make sure it's set when it should be. >>> >>>> I could provide a code-snippet >>>> to reproduce it if wanted ? >>> >>> Yes, please! >>=20 >> That might not be necessary.=A0 If you're able to build the git repo=20 >> master branch, please try the attached patch. >Here's a better patch. I finally succeeded to build latest master (make is not my favourite = tool) and added the patch, but still no success in my little test-program (see attachment) when creating a write-file-descriptor with O_NONBLOCK =20 >Ken ------=_NextPart_000_00BA_01D6044F.E08FDB60 Content-Type: text/plain; name="pipe.cpp" Content-Transfer-Encoding: quoted-printable Content-Disposition: attachment; filename="pipe.cpp" #include #include #include #include #include #include #include namespace { auto error(const int error) { std::cerr << getpid() << "\terror:\t" << error << '\t' << = std::strerror(error) << std::endl; return error; } } int main() { const auto name{"/tmp/my_name"}; const auto result =3D mkfifo(name, 0666); if(result) return error(errno); constexpr auto writers{5}; constexpr auto messages{4}; for(auto idx =3D 0; idx < writers; ++idx) { const auto pid =3D fork(); if(pid < 0) return error(errno); if(pid =3D=3D 0) { std::cout << "child " << getpid() << std::endl; for(auto idx =3D 0; idx < messages; ++idx) { const auto wfd =3D open(name, O_WRONLY | O_NONBLOCK); if(wfd < 0) return error(errno); const auto msg{std::to_string(getpid())}; if(write(wfd, msg.data(), msg.size() + 1) < 0) error(errno); close(wfd); } return 0; } } { std::cout << "parent" << std::endl; const auto rfd =3D open(name, O_RDONLY); const auto wfd =3D open(name, O_WRONLY); if(rfd < 0) return error(errno); for(auto idx =3D 0; idx < writers * messages; ++idx) { std::string buffer; buffer.resize(80); if(read(rfd, &buffer[0], buffer.size()) < 0) error(errno); std::cout << buffer << std::endl; } close(wfd); close(rfd); } if(unlink(name) < 0) return error(errno); return 0; } ------=_NextPart_000_00BA_01D6044F.E08FDB60 Content-Type: text/plain; charset="us-ascii" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit Content-Disposition: inline -- Problem reports: https://cygwin.com/problems.html FAQ: https://cygwin.com/faq/ Documentation: https://cygwin.com/docs.html Unsubscribe info: https://cygwin.com/ml/#unsubscribe-simple ------=_NextPart_000_00BA_01D6044F.E08FDB60--