linux-kernel - Re: [linux-pm] [suspend/resume] Re: userspace notification from module

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Date:	Tue, 05 Jan 2010 10:07:06 +0100
From:	Anders Eriksson <aeriksson@...tmail.fm>
To:	"Rafael J. Wysocki" <rjw@...k.pl>
cc:	Bartłomiej Zimoń <uzi18@...pl>,
	awalls@...ix.net, linux-pm@...ts.linux-foundation.org,
	linux-kernel@...r.kernel.org, danborkmann@...glemail.com
Subject: Re: [linux-pm] [suspend/resume] Re: userspace notification from module


rjw@...k.pl said:
>> > 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). 

Wouldn't there need to be dependecy tracking for the userspace processes? A 
process couldn't signal "done" until it know there's no more work to do, which 
requires all other processes to finish up first.

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