From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (qmail 21870 invoked by alias); 23 Mar 2011 15:00:51 -0000 Received: (qmail 21818 invoked by uid 22791); 23 Mar 2011 15:00:49 -0000 X-SWARE-Spam-Status: No, hits=-1.9 required=5.0 tests=AWL,BAYES_00,RCVD_IN_DNSWL_NONE,TW_FD,UNPARSEABLE_RELAY X-Spam-Check-By: sourceware.org Received: from nm29-vm0.bullet.mail.ne1.yahoo.com (HELO nm29-vm0.bullet.mail.ne1.yahoo.com) (98.138.91.43) by sourceware.org (qpsmtpd/0.43rc1) with SMTP; Wed, 23 Mar 2011 15:00:42 +0000 Received: from [98.138.90.57] by nm29.bullet.mail.ne1.yahoo.com with NNFMP; 23 Mar 2011 15:00:39 -0000 Received: from [98.138.84.40] by tm10.bullet.mail.ne1.yahoo.com with NNFMP; 23 Mar 2011 15:00:39 -0000 Received: from [127.0.0.1] by smtp108.mail.ne1.yahoo.com with NNFMP; 23 Mar 2011 15:00:39 -0000 Received: from cgf.cx (cgf@98.110.183.159 with login) by smtp108.mail.ne1.yahoo.com with SMTP; 23 Mar 2011 08:00:39 -0700 PDT X-Yahoo-SMTP: jenXL62swBAWhMTL3wnej93oaS0ClBQOAKs8jbEbx_o- Received: from ednor.cgf.cx (ednor.casa.cgf.cx [192.168.187.5]) by cgf.cx (Postfix) with ESMTP id E737613C0C4 for ; Wed, 23 Mar 2011 11:00:38 -0400 (EDT) Received: by ednor.cgf.cx (Postfix, from userid 201) id DA46F2B35F; Wed, 23 Mar 2011 11:00:38 -0400 (EDT) Date: Wed, 23 Mar 2011 15:02:00 -0000 From: Christopher Faylor To: cygwin@cygwin.com Subject: Re: python select() is limited to fds < 64 Message-ID: <20110323150038.GE13862@ednor.casa.cgf.cx> Reply-To: cygwin@cygwin.com Mail-Followup-To: cygwin@cygwin.com References: <4D88F89B.6000308@dronecode.org.uk> <4D88FE3E.2070607@sh.cvut.cz> <20110322200804.GA22409@ednor.casa.cgf.cx> <4D89DA22.9010404@dronecode.org.uk> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <4D89DA22.9010404@dronecode.org.uk> User-Agent: Mutt/1.5.20 (2009-06-14) Mailing-List: contact cygwin-help@cygwin.com; run by ezmlm Precedence: bulk List-Id: List-Subscribe: List-Archive: List-Post: List-Help: , Sender: cygwin-owner@cygwin.com Mail-Followup-To: cygwin@cygwin.com X-SW-Source: 2011-03/txt/msg00682.txt.bz2 On Wed, Mar 23, 2011 at 11:31:46AM +0000, Jon TURNEY wrote: >On 22/03/2011 20:08, Christopher Faylor wrote: >>On Tue, Mar 22, 2011 at 08:53:34PM +0100, V??clav Haisman wrote: >>>Jon TURNEY wrote, On 22.3.2011 20:29: >>>> >>>>python seems to be built with the default value of FD_SETSIZE, which is >>>>only 64 on cygwin. >>>Is this not because of the inherent limitation of >>>WaitForMultipleObjects() call? >> >>Yep. Without a rewrite, it's a hard limit to Cygwin's select(). > >Please read my email more closely. I am not saying "python select() is >limited to waiting on 64 fds or less", I am saying "python select() is >limited to waiting on fd which are less than 64" I forgot to add one bit of data. Unless you go out of your way to change it, Cygwin's select can't wait for an fd > 63. It's basically a bit mask. So, there are two limitations: 1) the number of handles that you can wait for with WaitForMultipleObjects() and 2) the size of Cygwin's fd_set. cgf -- 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