[Omp] atomic directive semantics

[Sven Karlsson]

Hi again,

Sven Karlsson wrote:
> implementations, like mine, revert to locks if there is no hardware 

To avoid confusion. I did mean locks and flush regions. Without the 
flush regions the atomic directive loose semantics. Also, you will 
probably use multiple locks to allow concurrency between different 
atomic directives operating on different storage locations although this 
is implementation defined.

And sorry about the double posting. The local mailserver seems to be 
playing tricks on me...

Best regards
  Sven