linux-kernel - Re: lsusd - The Linux SUSpend Daemon

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Date:	Sat, 22 Oct 2011 12:31:58 -0400 (EDT)
From:	Alan Stern <stern@...land.harvard.edu>
To:	NeilBrown <neilb@...e.de>
cc:	John Stultz <john.stultz@...aro.org>,
	"Rafael J. Wysocki" <rjw@...k.pl>,
	mark gross <markgross@...gnar.org>,
	Linux PM list <linux-pm@...r.kernel.org>,
	LKML <linux-kernel@...r.kernel.org>
Subject: Re: lsusd - The Linux SUSpend Daemon

On Fri, 21 Oct 2011, Alan Stern wrote:

> > Maybe we could do something with futexes...
> 
> Not easily -- as far as I can tell, futexes enjoy relatively little 
> support.  In any case, they provide the same service as a mutex, which 
> means you'd have to build a shared lock on top of them.

It occurred to me that we could create a new type of special file, one
intended to help with interprocess synchronization.  It would support
locking (shared or exclusive, blocking or non-blocking) and the poll
system call -- the file would appear to be ready for reading whenever a
shared lock wouldn't block and ready for writing whenever an exclusive
lock wouldn't block.  Actual reads and writes wouldn't have to do 
anything, although maybe someone could suggest a use for them.

Alan Stern

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