From: "Rafael J. Wysocki" <rjw@sisk.pl>
To: =?utf-8?q?Bart=C5=82omiej_Zimo=C5=84?= <uzi18@o2.pl>
Subject: Re: [suspend/resume] Re: userspace notification from module
Date: Mon, 4 Jan 2010 20:43:26 +0100
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       linux-pm@lists.linux-foundation.org, stern@rowland.harvard.edu
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On Monday 04 January 2010, Bartłomiej Zimoń wrote:
> 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 :)

I don't see a good reason, really.

Rafael
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