Re: Uses for memory barriers

[Alan Stern]

On Fri, 8 Sep 2006, Oliver Neukum wrote:

> > Again you have misunderstood.  The original code was _not_ incorrect.  I 
> > was asking: Given the code as stated, would the assertion ever fail?
> 
> I claim the right to call code that fails its own assertions incorrect. :-)

Touche!

> > The code _was_ correct for my purposes, namely, to illustrate a technical 
> > point about the behavior of memory barriers.
> 
> I would say that the code may fail the assertion purely based
> on the formal definition of a memory barrier. And do so in a subtle
> and inobvious way.

But what _is_ the formal definition of a memory barrier?  I've never seen 
one that was complete and correct.

Alan Stern

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