Subject: =?UTF-8?Q?Re:_[suspend/resume]_Re:_userspace_notification_from_module?=
From: =?UTF-8?Q?Bart=C5=82omiej_Zimo=C5=84?= <uzi18@o2.pl>
To: linux-kernel@vger.kernel.org
Cc: rjw@sisk.pl, awalls@radix.net, danborkmann@googlemail.com,
       linux-pm@lists.linux-foundation.org, stern@rowland.harvard.edu
In-Reply-To: <201001040045.39517.rjw@sisk.pl>
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Date: Mon, 04 Jan 2010 01:51:40 +0100
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Dnia 4 stycznia 2010 0:45 "Rafael J. Wysocki" <rjw@sisk.pl> napisał(a):
> On Monday 04 January 2010, Bartłomiej Zimoń wrote:
> > Thx Rafael - now it clear to me.
> > And what do You think about sending extra signals to processes?
> 
> I don't see a problem with this in principle, although I don't think signals
> are very suitable for this particular purpose, because you need two-way
> communication between the power manager and the processes it's going to
> notify (because it has to wait for the processes to finish their preparations
> and to tell it that they are ready).
> 
> For this purpose it's better to have a file descriptor you can block on (like a
> socket or a pipe) while the other side is doing it's job.
> 

So let's create one in power/user.c or use /sys/power/state for this :)

Best regards.
Bartłomiej Zimoń
PLD Linux, Kadu Team, FreeRunner user
http://kadu-im.blogspot.com/

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