linux-kernel - Re: [PATCH v2] Input: evdev - Add EVIOC mechanism to extract the MT slot state

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Message-ID: <20120106185544.GB2795@polaris.bitmath.org>
Date:	Fri, 6 Jan 2012 19:55:44 +0100
From:	"Henrik Rydberg" <rydberg@...omail.se>
To:	Dmitry Torokhov <dmitry.torokhov@...il.com>
Cc:	Benjamin Tissoires <benjamin.tissoires@...il.com>,
	linux-input@...r.kernel.org, linux-kernel@...r.kernel.org,
	Chase Douglas <chase.douglas@...onical.com>
Subject: Re: [PATCH v2] Input: evdev - Add EVIOC mechanism to extract the MT
 slot state

> 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
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