[linux-pm] [PATCH 01/13] PM: Add wake lock api.

Matthew Garrett mjg59 at srcf.ucam.org
Fri Feb 13 09:05:18 PST 2009


On Fri, Feb 13, 2009 at 05:46:42PM +0100, Uli Luckas wrote:

> That's racy. By the time the daemon notices that a process crashed, the kernel 
> might already have triggered suspend. userspace might then be frozen before 
> it can accuire the 'process restarting' lock.
> I also wonder, if it is immanently racy to use userspcae communication 
> (client/daemon) for suspend locks. What if the daemon is already frozen when 
> a client sends a lock request request? 

The daemon holds the lock in the first place. There's no race. As for 
issues with the freezer, I think my position on that is fairly well 
known...

-- 
Matthew Garrett | mjg59 at srcf.ucam.org


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