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    SubjectRe: MM deadlock [was: Re: arca-vm-8...]
    > The problem is that "owner" can be stale, and can be updated outside the
    > semaphore spinlock by a successful down() - which means that there are no
    > synchronizing primitives there to guarantee that the slow part sees the
    > new owner.

    The only instruction I can see that can adjust both the count and owner
    together is cmpxchg8, and I don't see a good way to use it.


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