Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1754747Ab0AURum (ORCPT ); Thu, 21 Jan 2010 12:50:42 -0500 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1752777Ab0AURuk (ORCPT ); Thu, 21 Jan 2010 12:50:40 -0500 Received: from x35.xmailserver.org ([64.71.152.41]:59101 "EHLO x35.xmailserver.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1754713Ab0AURuj (ORCPT ); Thu, 21 Jan 2010 12:50:39 -0500 X-AuthUser: davidel@xmailserver.org Date: Thu, 21 Jan 2010 09:50:34 -0800 (PST) From: Davide Libenzi X-X-Sender: davide@makko.or.mcafeemobile.com To: Avi Kivity cc: "Michael S. Tsirkin" , mtosatti@redhat.com, kvm@vger.kernel.org, Linux Kernel Mailing List Subject: Re: [PATCHv2 1/3] eventfd: allow atomic read and waitqueue remove In-Reply-To: <4B58933C.4090209@redhat.com> Message-ID: References: <20100121162648.GA16458@redhat.com> <4B588B29.2050100@redhat.com> <20100121172336.GA16707@redhat.com> <4B588FCE.7030803@redhat.com> <20100121173259.GC16707@redhat.com> <4B58933C.4090209@redhat.com> User-Agent: Alpine 2.00 (DEB 1167 2008-08-23) X-GPG-FINGRPRINT: CFAE 5BEE FD36 F65E E640 56FE 0974 BF23 270F 474E X-GPG-PUBLIC_KEY: http://www.xmailserver.org/davidel.asc MIME-Version: 1.0 Content-Type: TEXT/PLAIN; charset=US-ASCII Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 590 Lines: 24 On Thu, 21 Jan 2010, Avi Kivity wrote: > On 01/21/2010 07:32 PM, Michael S. Tsirkin wrote: > > > > > Can't you read from the file? > > > > > IMO no, the read could block. > > > > But you're in process context. An eventfd never blocks. Can you control the eventfd flags? Because if yes, O_NONBLOCK will never block. - Davide -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/