Am Dienstag, 21. September 2004 19:58 schrieb David Brownell:
> Oliver Neukum wrote:
>
> >
> > IMHO USB is the unusual case because it is a bus and a tree. A
> > generic locking model probably has to lock the whole bus. Or of course,
> > on a higher level. Is there enough contention that a global lock would
> > be impractical?
>
> A generic model has to understand that any computer nowadays is
> built from a tree of busses ... just like USB is built from
> a tree of hubs. Trees are the _normal_ case.
But a tree can be treated as a bus by a lock on the root,
the reverse is not true.
> Contention is curious; something like dpm_sem wouldn't really be
> high-contention if it weren't trying to protect the power lists.
> The problem there is that lock tries to protect too much, with
> resulting self-deadlocks.
What is the alternative?
Regards
Oliver
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