[Mpi3-rma] MPI_Fetch_and_op and predefined datatypes

[Hubert Ritzdorf]

Hi,

Page 429, Line 41-42 specifies for MPI_Fetch_and_op:

The datatype argument must be a predefi?ned datatype.

I think it should be:

The datatype argument must be a MPI basic datatype (cf. Section 5.9.2 on page 176).

Reasons:

(*) This would be consistent to the reduce functions and MPI_Compare_and_swap
     and would allow handles returned by MPI_TYPE_CREATE_F90_INTEGER,
     MPI_TYPE_CREATE_F90_REAL, or MPI_TYPE_F90_COMPLEX.

(*) MPI_Compare_and_swap accepts handles created by
     MPI_TYPE_CREATE_F90_INTEGER ( they are contained in Fortran integer category).

(*) Predefined datatypes such as MPI_WCHAR or MPI_PACKED are useless in
    MPI_Fetch_and_op.


Additionally, on   Page 430, Line 39:
               predefined datatypes
should be replaced by
               basic datatypes
since Section 5.9.2 defines the  MPI basic datatypes and not the predefined
datatypes (which are defined in Tables 3.x).

Hubert

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