Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S263782AbTGHPrc (ORCPT ); Tue, 8 Jul 2003 11:47:32 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S264083AbTGHPrb (ORCPT ); Tue, 8 Jul 2003 11:47:31 -0400 Received: from ev2.cpe.orbis.net ([209.173.192.122]:25738 "EHLO srv.foo21.com") by vger.kernel.org with ESMTP id S263782AbTGHPrb (ORCPT ); Tue, 8 Jul 2003 11:47:31 -0400 Date: Tue, 8 Jul 2003 11:02:06 -0500 From: Eric Varsanyi To: Davide Libenzi Cc: Linux Kernel Mailing List Subject: Re: epoll vs stdin/stdout Message-ID: <20030708160206.GP9328@srv.foo21.com> References: <20030707154823.GA8696@srv.foo21.com> <20030707194736.GF9328@srv.foo21.com> <20030708154636.GM9328@srv.foo21.com> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: User-Agent: Mutt/1.4i Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1479 Lines: 22 On Tue, Jul 08, 2003 at 08:42:29AM -0700, Davide Libenzi wrote: > It is not that events are delivered per-fd. If 3 and 4 refer to the same > file* and you register both 3 and 4 with EPOLLIN, you'll get two events if > an EPOLLIN happen. One for 3 and one for 4. Agreed 100%, this is roughly what would happen with select() as well which IMO is good (not surprising behaviour) for event loop writers: it would return with both bits set. The EEXIST we were getting before this patch would be analogous to select() returning an error if you set 2 bits that where for fd's sharing an object (even across read/write bit vectors). One could argue at the logic of having 2 fd's get read events on a shared underlying object, but one read and the other write certainly makes sense as discussed earlier. Thanks again, -Eric Varsanyi - 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/