From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from sfi-mx-3.v28.ch3.sourceforge.com ([172.29.28.123] helo=mx.sourceforge.net) by h25xhf1.ch3.sourceforge.com with esmtp (Exim 4.69) (envelope-from ) id 1LrIlW-0003AJ-Qr for user-mode-linux-devel@lists.sourceforge.net; Tue, 07 Apr 2009 21:23:30 +0000 Received: from mail.gmx.net ([213.165.64.20]) by 3b2kzd1.ch3.sourceforge.com with smtp (Exim 4.69) id 1LrIlV-0002Qc-TO for user-mode-linux-devel@lists.sourceforge.net; Tue, 07 Apr 2009 21:23:30 +0000 Message-ID: <49DBC44A.5070700@gmx.de> Date: Tue, 07 Apr 2009 23:23:22 +0200 From: Ingo van Lil MIME-Version: 1.0 References: <49DB91C6.7030005@gmx.de> <49DB9B13.80203@meduna.org> In-Reply-To: <49DB9B13.80203@meduna.org> Subject: Re: [uml-devel] Multi-threaded applications and floating point registers List-Id: The user-mode Linux development list List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Errors-To: user-mode-linux-devel-bounces@lists.sourceforge.net To: Stanislav Meduna Cc: user-mode-linux-devel@lists.sourceforge.net Stanislav Meduna wrote: >> I'm experiencing some weird problems with a multi-threaded application >> I'm working on: A function which uses nothing but a single input value, >> a few constants and a couple of floating point operations returns wrong >> results from time to time. The application uses multiple threads, and >> we're suspecting that the FPU state isn't properly saved and restored >> when switching between threads within a process. > > I had a similar problem between processes a few months ago, > I also posted an example, unfortunately with no resolution > nor further inquiries from the developers. I suspect the skas3 > patch does not get much attention now... Yes, I remember the thread. I don't think we're hitting the same problem, though: I'm not using the SKAS3 patch, and I did not notice any kind of cross-process influence. The effect is limited to threads sharing a single process context. Regards, Ingo ------------------------------------------------------------------------------ This SF.net email is sponsored by: High Quality Requirements in a Collaborative Environment. Download a free trial of Rational Requirements Composer Now! http://p.sf.net/sfu/www-ibm-com _______________________________________________ User-mode-linux-devel mailing list User-mode-linux-devel@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/user-mode-linux-devel