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From: Markus Schöpflin (markus.schoepflin_at_[hidden])
Date: 2007-11-09 06:52:31

Peter Dimov wrote:

> Markus Schöpflin:
>> Peter,
>> I have read your paper referenced above and a few of the other papers
>> dealing with atomic ops, but I failed to find a clear definition of what
>> 'acquire' and 'release' semantics are supposed to mean. Could you point
>> me into the right direction, please? Also, in your paper you're
>> referring to [intro.concur], where could I find this?
> I think that the relevant paper at the moment is
> Basically, if a thread A load-acquires a memory location that has been
> store-released by thread B, then after the load thread A is guaranteed to
> see the updates that thread B has done prior to the store.

Peter, I have been reading your paper again and I'm puzzled by the
following sentence (section 'Fences'): "Release, ensures that all preceding
operations in program order are performed after all subsequent stores in
program order;".

Shouldn't that read that all preceding operations are performed _before_
all subsequent stores, instead of after?


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