From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1758981Ab2AFSzt (ORCPT ); Fri, 6 Jan 2012 13:55:49 -0500 Received: from smtprelay-b21.telenor.se ([195.54.99.212]:38239 "EHLO smtprelay-b21.telenor.se" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1756639Ab2AFSzr (ORCPT ); Fri, 6 Jan 2012 13:55:47 -0500 X-SENDER-IP: [85.230.170.239] X-LISTENER: [smtp.bredband.net] X-IronPort-Anti-Spam-Filtered: true X-IronPort-Anti-Spam-Result: Aj9fAMVCB09V5qrvPGdsb2JhbABDiVaiahkBAQEBNzKBcgEBBAE6HCMFCwgDRhQlChqIDQK2MxOLG2MEjTKHVIVfjFg X-IronPort-AV: E=Sophos;i="4.71,469,1320620400"; d="scan'208";a="23351422" From: "Henrik Rydberg" Date: Fri, 6 Jan 2012 19:55:44 +0100 To: Dmitry Torokhov Cc: Benjamin Tissoires , linux-input@vger.kernel.org, linux-kernel@vger.kernel.org, Chase Douglas Subject: Re: [PATCH v2] Input: evdev - Add EVIOC mechanism to extract the MT slot state Message-ID: <20120106185544.GB2795@polaris.bitmath.org> References: <1325863019-2242-1-git-send-email-rydberg@euromail.se> <20120106181845.GA22653@core.coreip.homeip.net> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20120106181845.GA22653@core.coreip.homeip.net> User-Agent: Mutt/1.5.21 (2010-09-15) Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org > 2 different processes should be fine; the problem would be if 2 threads > of the same process share the same file descriptor. So far the rest of > evdev copes just fine with multiple threads using the same fd (all > operations are atomic in this regard), setting ABS_MT_SLOT before > fetching the state break this property. Are we talking about the need for a per-client mutex, or something more subtle, like introducing indirect coupling between threads through per-client states? The former ought to be easily remedied. Henrik