linux-kernel - Re: [linux-pm] [PATCH 0/8] Suspend block api (version 8)

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Message-ID: <20100529160915.051ab19f@lxorguk.ukuu.org.uk>
Date:	Sat, 29 May 2010 16:09:15 +0100
From:	Alan Cox <alan@...rguk.ukuu.org.uk>
To:	Brian Swetland <swetland@...gle.com>
Cc:	Alan Stern <stern@...land.harvard.edu>,
	Florian Mickler <florian@...kler.org>,
	Peter Zijlstra <peterz@...radead.org>,
	"Rafael J. Wysocki" <rjw@...k.pl>,
	Linux PM <linux-pm@...ts.linux-foundation.org>,
	Arve Hjønnevåg <arve@...roid.com>,
	Matthew Garrett <mjg59@...f.ucam.org>,
	Thomas Gleixner <tglx@...utronix.de>,
	LKML <linux-kernel@...r.kernel.org>, Ingo Molnar <mingo@...e.hu>
Subject: Re: [linux-pm] [PATCH 0/8] Suspend block api (version 8)

> Could we have write(powerstate_fd, "qos",3) block until all
> QOS_EVENTUALLY constraints are lifted or the system successfully
> suspends and resumes or a signal arrives?

Yes - and you can then use alarm() or similar to do timeouts (or write
the timeout to the fd ?)

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