Re: JavaMemoryModel: fusing synch blocks

From: Doug Lea (
Date: Fri Feb 02 2001 - 12:21:36 EST

> * At a point where a thread releases a lock (in the original
> program), if another thread of equal or higher priority is waiting on
> the lock, the other thread should be allowed to obtain (perhaps we
> need to limited this to "compete for") the lock within a short
> interval.

Well, I hope not to be too cynical or pessimistic about this, but I
am. Last I knew, there are JVM providers who absolutely will not
accept such rules. (I believe that similar issues arose in POSIX.) I
think the best we could hope for universal acceptance of is
probablistic weak fairness. ("probablistic" because anything based in
part on spinlocks will rely in part on effectively random hardware


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