Marc, Bill, and Rajeev, Marc, as far as I remember, you are the author of the 6 rules on one-sided semantics on MPI-3.0 page 453 line 39 through page 454 line 21 (in MPI-2.0 the rules were on page 138). At ISC 2014, Pavan Balaji, Hubert Ritzdorf and I met to discuss the unclear RMA synchronization for shared memory, but we had to start with a problem in RMA semantics that exists since MPI-2.0. The outcome was https://svn.mpi-forum.org/trac/mpi-forum-web/ticket/434 Marc as original author, Bill and Rajeev as chapter chairs, please can you check whether we are right with this ticket: - that the gap between the expected behavior and the current semantic rules really exists, and - that our solution is correct, - and hopefully that it is a good way of filling the gap. Best regards Rolf -- Dr. Rolf Rabenseifner . . . . . . . . . .. email [email protected] High Performance Computing Center (HLRS) . phone ++49(0)711/685-65530 University of Stuttgart . . . . . . . . .. fax ++49(0)711 / 685-65832 Head of Dpmt Parallel Computing . . . www.hlrs.de/people/rabenseifner Nobelstr. 19, D-70550 Stuttgart, Germany . . . . (Office: Room 1.307)