2006/1/18, Daniel Eischen <[EMAIL PROTECTED]>: > I assume we already know how to propagate priority for mutexes, so > once you know how to propagate for RWlocks, it all just works. As I can see, propagate priority for mutex needs a little modify to turnstiles code, that's not a great deal.
> Yes, once you choose a thread to propagate, you have to keep > propagating through whatever it is blocked on or until you > reach a point where the propagated priority is <= the priority > of the next thread in the heirarchy. I never questioned that > part of it, just the need to do it for all threads owning the > RW lock at the same time. Maybe it's not "strictly" necessary but please consider that "blocking hierarchies" are never too long and a total priority propagation would be quicker (you however need to propagate to every owner in the end so doing it at the same time could craft a bottleneck if the hierarchy is too long, but it's a rare case and in the opposite way you need to rule 'what thread needs to be update' every time a blocking thread is unblocked). Cheers, Attilio -- Peace can only be achieved by understanding - A. Einstein _______________________________________________ freebsd-hackers@freebsd.org mailing list http://lists.freebsd.org/mailman/listinfo/freebsd-hackers To unsubscribe, send any mail to "[EMAIL PROTECTED]"
