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SubjectRe: furwocks: Fast Userspace Read/Write Locks
On Thu, Mar 07, 2002 at 10:33:32AM -0500, Hubertus Franke wrote:
> On Thursday 07 March 2002 07:50 am, Arjan van de Ven wrote:
> > Rusty Russell wrote:
> > > This is a userspace implementation of rwlocks on top of futexes.
> >
> > question: if rwlocks aren't actually slower in the fast path than
> > futexes,
> > would it make sense to only do the rw variant and in some userspace
> > layer
> > map "traditional" semaphores to write locks ?
> > Saves half the implementation and testing....
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>
> I m not in favor of that. The dominant lock will be mutexes.

if there's no extra cost I don't care which is dominant; having one well
tested path is worth it then. If there is extra cost then yes a split is
better.
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