[Mpi3-rma] Fix for win_allocate_shared

[Pavan Balaji]

On 09/23/2011 02:39 AM, Torsten Hoefler wrote:
> "The semantic rules for shared memory windows in the MPI_RMA_SEPARATE
> model allow concurrent load/store accesses from two distinct processes
> to the same target window that is remote to both processes. An
> implementation cannot expose shared memory windows on hardware that does
> not support this access mode."

This seems to suggest that it won't work for non-cache-coherent systems. 
Didn't we decide against that?

-- 
Pavan Balaji
http://www.mcs.anl.gov/~balaji