From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from NAM10-BN7-obe.outbound.protection.outlook.com (mail-bn7nam10on2121.outbound.protection.outlook.com [40.107.92.121]) by sourceware.org (Postfix) with ESMTPS id 758ED385E009 for ; Sat, 28 Mar 2020 15:43:06 +0000 (GMT) DMARC-Filter: OpenDMARC Filter v1.3.2 sourceware.org 758ED385E009 ARC-Seal: i=1; a=rsa-sha256; s=arcselector9901; d=microsoft.com; cv=none; b=eIOoN+T1YHVpHWVLJ0QJ5L9N6dYS4uVLIZHWZq4zPoXedIoDGSeYh1PT2BOVPrbaSHDajndHfooxA/JdIFNS3QjnLL94F/wNeeRxeXFl/A/52tiZj0DVQNR5Cu0eMaXKH9GCVuwdhzzsi+57P/JX9bfQoDmeMBl7BSM94+SYx0aZHGT8CdUUqWC+ca3qQU6IQ6n6xW8NbeA9KOEbBlXtJjujB0fxo0Lmeo6tpgaPQHUngA0nWh1Am5T+stiJ0nHJRgoN7rbiJXSqAw38WjlcuOKpuzS5ww0AdhtVZclmEzT+UYP9BVn4nC5HXaUVrOiW3idJwtzcBinmFooc4A0L4w== ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=microsoft.com; s=arcselector9901; h=From:Date:Subject:Message-ID:Content-Type:MIME-Version:X-MS-Exchange-SenderADCheck; bh=WKq4qZkZd5RGJumnaHSCPIRZWRnUuH6mphrZqoC+/zI=; 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CTRY:; LANG:en; SCL:1; SRV:; IPV:NLI; SFV:NSPM; H:DM6PR04MB6075.namprd04.prod.outlook.com; PTR:; CAT:NONE; SFTY:; SFS:(10019020)(4636009)(366004)(39860400002)(136003)(376002)(396003)(346002)(16576012)(36756003)(81166006)(86362001)(6486002)(26005)(956004)(31686004)(81156014)(186003)(16526019)(8676002)(8936002)(6916009)(53546011)(2616005)(75432002)(52116002)(478600001)(66556008)(66476007)(316002)(4326008)(66946007)(5660300002)(2906002)(786003)(31696002); DIR:OUT; SFP:1102; Received-SPF: None (protection.outlook.com: cornell.edu does not designate permitted sender hosts) X-MS-Exchange-SenderADCheck: 1 X-Microsoft-Antispam: BCL:0; X-Microsoft-Antispam-Message-Info: W7hmyTO3npKvwxZwIAyJAHvK/wIscietSNYNiO+w5pqTKbQw+7ck1NY/3XPMwkVafOxoKAognyVKtlBmQVJBUmV4AIVhQToIdVfsW7FJpC7X/p8rrc0epgoABxZBQ/96gipKfBFAg1tvWEsrAm85DFiZpFFSJEA8P/PFjTHdp4EKFXd9DrMcSqdNEOXxgDiQKBzUjh5MLvDTaQGWnLLvyThT9PWZuv+yYPoRdMzqbQmvt/viQc6Ezu5Q6nqT0iTgZRigqTutJR56nCC/0H+ysz90yJJcFQugWX4E4aGj2solSXplXhyTXx0u+Mtx5ui97oo23EuHeioVWw/hdf8SRzrwJRv59Mj2AzFiCMSuEwi5fMZpZ9Z/bi5UUIZJlf5v1GaWpXxV2w8nFx4GU00YfjlAwS83SLPLxj3+o7uOw6wc6iSEJxMYguT31kX576GY X-MS-Exchange-AntiSpam-MessageData: RFD8aPQnitxKo2GwsbbyMJSKdsKn9DSeo/U4fWasfwCsyz2dc43e/WKk0fqQNlv1XYslLOw+HMKlV3iDWrctrzWhv1xsVPYfNGKwFkUKt/MXpTs7FDV8JPf0PmcHgvJ6BXfR/DwtHDLgQL/pdy/PEg== X-OriginatorOrg: cornell.edu X-MS-Exchange-CrossTenant-Network-Message-Id: 9eed318d-4862-473d-01db-08d7d32eb4fa X-MS-Exchange-CrossTenant-OriginalArrivalTime: 28 Mar 2020 15:43:05.6033 (UTC) X-MS-Exchange-CrossTenant-FromEntityHeader: Hosted X-MS-Exchange-CrossTenant-Id: 5d7e4366-1b9b-45cf-8e79-b14b27df46e1 X-MS-Exchange-CrossTenant-MailboxType: HOSTED X-MS-Exchange-CrossTenant-UserPrincipalName: EYO0GtXH33QZ6QOxYyTPcOvjLSAey5U4ywdQi/e8Zry6k678ybrR3mzbftxgGQd0O73y0iS/8y1v+GZGmyI9EA== X-MS-Exchange-Transport-CrossTenantHeadersStamped: DM6PR04MB5434 X-Spam-Status: No, score=-2.4 required=5.0 tests=BAYES_00, DKIM_INVALID, DKIM_SIGNED, KAM_DMARC_STATUS, MSGID_FROM_MTA_HEADER, RCVD_IN_DNSWL_NONE, RCVD_IN_MSPIKE_H2, SPF_HELO_PASS, SPF_PASS, TXREP autolearn=no 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@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: Sat, 28 Mar 2020 15:43:09 -0000 On 3/28/2020 8:10 AM, sten.kristian.ivarsson@gmail.com wrote: >> On 3/27/2020 10:53 AM, sten.kristian.ivarsson@gmail.com wrote: >>>> 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.kristian.ivarsson@gmail.com wrote: >>>>>>> The ENIXIO occurs when parallel child-processes simultaneously >>>>>>> using O_NONBLOCK opening the descriptor. >>>>>> >>>>>> This is consistent with my guess that the error is generated by >>>>>> fhandler_fifo::wait.  I have a feeling that read_ready should have >>>>>> been created as a manual-reset event, and that more care is needed >>>>>> to make sure it's set when it should be. >>>>>> >>>>>>> I could provide a code-snippet >>>>>>> to reproduce it if wanted ? >>>>>> >>>>>> Yes, please! >>>>> >>>>> That might not be necessary.  If you're able to build the git repo >>>>> 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 > >> Your test program fails for me on Linux too. Here's the output from one > run: > > You're right. That was extremely careless of me to not test this in Linux > first :-) No problem. > I can assure that we have a use case that works on Linux but not in Cygwin, > but it seems like I failed to narrow it down in the wrong way > > I'll try to rearrange my code (that works in Linux) to mimic our application > but in a simple way (I'll be back) OK, I'll be waiting for you. BTW, if it's not too hard to write your test case in plain C, or at least less modern C++, that would simplify things for me. For example, your pipe.cpp failed to compile on one Linux machine I wanted to test it on, presumably because that machine had an older C++ compiler. Ken