X-Recipient: archive-cygwin@delorie.com X-Spam-Check-By: sourceware.org Date: Tue, 31 Mar 2009 17:07:28 +0200 From: Corinna Vinschen To: cygwin@cygwin.com Subject: Re: IPC,FORK on Windows 2008 Server Message-ID: <20090331150728.GE12738@calimero.vinschen.de> Reply-To: cygwin@cygwin.com Mail-Followup-To: cygwin@cygwin.com References: <20090331112111.GB12738@calimero.vinschen.de> <20090331120843.GD12738@calimero.vinschen.de> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20090331120843.GD12738@calimero.vinschen.de> User-Agent: Mutt/1.5.19 (2009-02-20) Mailing-List: contact cygwin-help@cygwin.com; run by ezmlm Precedence: bulk List-Id: List-Unsubscribe: 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 Mar 31 14:08, Corinna Vinschen wrote: > On Mar 31 17:11, Yarlagadda Suresh wrote: > > Hi, > > > > I am using shmget()/shmat() methods for getting the shared memory. > > > > I had tried running the same program which is given in the previous > > mention thread, the results are same as mentioned over there. > > I just tried that testcase with Cygwin 1.7 and it appears to work most > of the time. Unfortunately I can still reproduce the problem once per > about 30 forks. > > I'll look into fixing this for Cygwin 1.7. However, please note that > there is no *really* foolproof method to fix this due to the way fork > has to be implemented using Win32 calls. I can only make it much more > unlikely than today. I applied a patch to Cygwin which allocates the shmat() shared memory regions top-down, same as the mmap() regions. This should make the observed effect at fork() pretty unlikely. The patch will be in the next Cygwin 1.7.0 test release (in a couple of days). Thanks for the report, Corinna -- Corinna Vinschen Please, send mails regarding Cygwin to Cygwin Project Co-Leader cygwin AT cygwin DOT com Red Hat -- Unsubscribe info: http://cygwin.com/ml/#unsubscribe-simple Problem reports: http://cygwin.com/problems.html Documentation: http://cygwin.com/docs.html FAQ: http://cygwin.com/faq/