X-Recipient: archive-cygwin@delorie.com X-SWARE-Spam-Status: No, hits=-2.6 required=5.0 tests=AWL,BAYES_00 X-Spam-Check-By: sourceware.org X-Cloudmark-SP-Filtered: true X-Cloudmark-SP-Result: v=1.0 c=1 a=kCKDY91tEBMc+hi4YtGk8Q==:17 a=D2wpsneiPbm1c1XpqiUA:9 a=pX_WJ2wZT2U0qD6Xi8vCzh1AaM8A:4 Message-ID: <4B4A1032.9030201@monai.ca> Date: Sun, 10 Jan 2010 09:36:50 -0800 From: Steven Monai User-Agent: Mozilla/5.0 (Windows; U; Windows NT 5.1; en-US; rv:1.9.1.5) Gecko/20091204 Thunderbird/3.0 MIME-Version: 1.0 To: cygwin@cygwin.com Subject: Re: Update problems References: <4B46A4C3.2000803@cygwin.com> <4B47986F.2020609@t-online.de> <4B47B3FA.1010101@cygwin.com> <4B47DBAE.5000901@monai.ca> <20100109100941.GL23992@calimero.vinschen.de> In-Reply-To: <20100109100941.GL23992@calimero.vinschen.de> Content-Type: text/plain; charset=ISO-8859-1 Content-Transfer-Encoding: 7bit X-IsSubscribed: yes Mailing-List: contact cygwin-help@cygwin.com; run by ezmlm List-Id: List-Subscribe: List-Archive: List-Post: List-Help: , Sender: cygwin-owner@cygwin.com Mail-Followup-To: cygwin@cygwin.com Delivered-To: mailing list cygwin@cygwin.com On 2010/01/09 2:09 AM, Corinna Vinschen wrote: > On Jan 8 17:28, Steven Monai wrote: >> Not to beat a dead hippo here, but if Cygwin allows in-use files to be >> replaced, then what is 'setup.exe' needed for? (Aside from the initial >> bootstrap of Cygwin, of course.) Shouldn't it be possible to have proper >> package management---like dpkg, apt, rpm, yum, etc---from within Cygwin now? > > The most pressing problem is the replacement of the cygwin DLL itself. > It's like installing a new kernel in Linux. However, in Linux you have > to reboot to use the new kernel, while Cygwin is just a DLL. After the > rename and replace operation, existing processes will use the old DLL > while new processes will use the new DLL. This is bound to break and > there's no clean way to do it, except to replace the Cygwin DLL while no > other Cygwin process is running. Could a Cygwin-specific package manager treat the cygwin DLL as a special case? Instead of immediately replacing the cygwin DLL file (as it would normally do for any other DLL), the package manager could use the Windows "schedule-a-delete/rename-on-reboot" facility to arrange for the DLL's replacement at the next reboot. Thus there would never be more than one version of the cygwin DLL loaded at any given time. -SM -- -- Problem reports: http://cygwin.com/problems.html FAQ: http://cygwin.com/faq/ Documentation: http://cygwin.com/docs.html Unsubscribe info: http://cygwin.com/ml/#unsubscribe-simple