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From: Alexander Terekhov (terekhov_at_[hidden])
Date: 2006-09-20 06:26:38

Anthony Williams wrote:
> Alexander Terekhov <terekhov_at_[hidden]> writes:
> > Anthony Williams wrote:
> > [...]
> >> He claims that the second A: lock takes the slow path, when it could have
> >> taken the fast path because the lock is free. I disagree. The lock is NOT
> >> free, since B is waiting on it. If A can take the fast path here, that's
> >> opening the door for B to be starved.
> >
> > That's not a problem as long what we need is efficient low level
> > exclusive lock. If starvation is a problem, one can solve it with
> > custom scheduling monitor on top of "grab if you can" low level
> > exclusive lock without handoff. Low level, all pigs are equal. ;-)
> So let them compete equally. If A doesn't wait on the semaphore, it has an
> unfair advantage.

If you can make them both "wait" on something but without really bad
consequence of handoff, I'd have no problems... except that it would
simply add totally pointless overhead.


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