(j3.2006) (SC22WG5.3719) [ukfortran] Atomic stuff

[N.M. Maclaren]

On Dec 3 2008, Jim Xia wrote:
>
>Nick, I don't see how that note (5.42) covers my example.

Sorry - written in too much haste.  It doesn't, if ATOMIC_INTEGER_KIND takes
the same space as two INTEGER(KIND=2) variables.

> Then it is clobbered by constraint C589, C590, C591 and 4.5.2.3.

That does it, though.

>Atomic loads and stores on mis-aligned variables are nearly impossible on 
>many hardwares (The solution to fix up the mis-alignment by either 
>hardware or OS causes the operation become non-atomic, let along the 
>performance hit).

Yes, but I think that those constraints already exclude it.

Regards,
Nick Maclaren,
University of Cambridge Computing Service,
New Museums Site, Pembroke Street, Cambridge CB2 3QH, England.
Email:  nmm1 at cam.ac.uk
Tel.:  +44 1223 334761    Fax:  +44 1223 334679