From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from endymion.arp.harvard.edu (endymion.arp.harvard.edu [140.247.179.94]) by sourceware.org (Postfix) with ESMTPS id CD00D385141E for ; Mon, 30 Nov 2020 18:26:37 +0000 (GMT) DMARC-Filter: OpenDMARC Filter v1.3.2 sourceware.org CD00D385141E Authentication-Results: sourceware.org; dmarc=none (p=none dis=none) header.from=huarp.harvard.edu Authentication-Results: sourceware.org; spf=pass smtp.mailfrom=allen@huarp.harvard.edu Received: from [192.168.7.24] (pool-74-104-152-231.bstnma.fios.verizon.net [74.104.152.231]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by endymion.arp.harvard.edu (Postfix) with ESMTPSA id 5D7B76C095A; Mon, 30 Nov 2020 13:26:37 -0500 (EST) Subject: Re: Unix Domain Socket Limitation? To: Ken Brown , cygwin References: <71490665-31b0-f63c-74da-461a053fac21@huarp.harvard.edu> <55ea1649-1979-6238-75ab-69100c22e069@cornell.edu> <4260ad1b-4ab2-fa36-fd0e-7c9644560114@huarp.harvard.edu> <38a82f82-1ef9-768e-7d3e-15f63147e188@cornell.edu> <16165727-f614-1543-70bc-36457ddbf260@cornell.edu> From: Norton Allen Message-ID: <75d1315b-5a56-a2e5-310d-6ac33a3cf17c@huarp.harvard.edu> Date: Mon, 30 Nov 2020 13:26:32 -0500 User-Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:78.0) Gecko/20100101 Thunderbird/78.5.0 MIME-Version: 1.0 In-Reply-To: <16165727-f614-1543-70bc-36457ddbf260@cornell.edu> Content-Type: text/plain; charset=windows-1252; format=flowed Content-Transfer-Encoding: 8bit Content-Language: en-US X-Spam-Status: No, score=-3.6 required=5.0 tests=BAYES_00, KAM_DMARC_STATUS, NICE_REPLY_A, RCVD_IN_DNSWL_LOW, 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@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: Mon, 30 Nov 2020 18:26:57 -0000 On 11/30/2020 1:14 PM, Ken Brown wrote: > I can reproduce the hang, and it happens if I use the new AF_UNIX code > also. But what I'm seeing (at least with the new code) isn't exactly > what you describe. > > When the server's first select call returns, accept succeeds.  The > server then calls select a second time, and that call doesn't return.  > I haven't checked yet to see what's going on in the client, and I may > not get to that for a while. > That's good news, and seems to be consistent with my theory that it is some sort of race condition that might be particularly sensitive to system-specific timing. I am compiling cygwin1.dll now.