Re: [Xen-devel] Xen scripts rewrite

[Marek Marczykowski <marmarek@xxxxxxxxxxxxxxxxxxxxxx>]

On 01.03.2012 13:38, Mark wrote:
> Greetings,
> 
> I am trying to wrap my head around the xen scripts in /etc/xen/scripts.
> I am currently looking at locking.sh but I don't really understand what
> it is doing.
> 
> I see that claim_lock has a while loop, it seems to wait until it can
> write its own PID to $lockdir/owner. If the file $lockdir/owner exists,
> check if the pid is still running. If it's still running when the
> loop is done, steal the lock by writing $$ to $lockdir/owner anyway.
> 
> Anyway. Can someone please further explain this file in plain English
> and detail. Am I right with my above assumptions, and when are locks
> even used?
> 
> As said, I request as much detail as possible - the rewrite is to
> improve efficiency, readability and user customisation. As it is now
> you have too much functions that confuse me silly.
> 
> If I am succesful I will share the outcome, so there's an incentive if
> you need one.

Current locking mechanism have some problems. I've written about it here:
http://lists.xen.org/archives/html/xen-devel/2011-07/msg00182.html

-- 
Best Regards / Pozdrawiam,
Marek Marczykowski
Invisible Things Lab

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