Re: MM deadlock [was: Re: arca-vm-8...]
Alan Cox (alan@lxorguk.ukuu.org.uk)
Tue, 12 Jan 1999 12:55:22 +0000 (GMT)
> 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.
Alan
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