[0.18][#109169][merge] add lock debugging, remove unnecessary lock peeks

[Robert Collins]

On Thu, 2007-07-05 at 13:31 +1000, Martin Pool wrote:
> 
> we could only rarely avoid peeking twice, so we do it unconditionally.
>  If that's unclear I can change the comment, or if we observe it
> actually happens often we can change it.
> 
> So for now I'd like to leave this, it could be tweaked more but I've
> basically done what I wanted which is to make it possible to see
> what's going on, and to fix the cruft-leaving bug. 

Ok.

-Rob
-- 
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