[Mpi3-rma] MPI_Fetch_and_op and predefined datatypes

Jim Dinan dinan at mcs.anl.gov
Fri Oct 26 23:34:10 CDT 2012

Did we also intend to include pair types for F&Op?  They are allowed in 


On 10/26/12 4:07 PM, Torsten Hoefler wrote:
> On Fri, Oct 26, 2012 at 04:22:02PM -0500, Jeff Hammond wrote:
>> I don't want to wait for 3.1.  Are we seriously going to require
>> MPI_WCHAR support in F&Op to be MPI-3 compliant?  That makes no sense.
> I think the intent of "Any of the predefined operations for MPI_REDUCE,
> as well as MPI_NO_OP or MPI_REPLACE, can be specified as op;
> user-defined functions cannot be used." is clear. One could even dream
> up a use-case for MPI_WCHAR if one wants to emulate an atomic read
> (using MPI_NO_OP).
> I will not vote against an errata if you want to propose text and
> initiate the process.
> Best,
>    Torsten

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