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MPI_TYPE_DUP_FN - Built-in MPI function to simple-mindedly copy datatype attributes.
#include <mpi.h>
int MPI_TYPE_DUP_FN(MPI_Datatype dtype, int key,
void *extra, void *attrin, void *attrout,
int *flag)
dtype
- communicator (handle)
key
- key value (integer)
extra
- extra state
attrin
- in value for attribute
attrout
- out value for attribute
flag
- 1 if attribute copied successfully, 0 otherwise (logical)
This function blindly byte-copies attributes on datatypes. It is the default atrribute-copying function for datatypes. This
function will always return MPI_SUCCESS, and flag will always be set to 1.
The actual copy is performed by the code
*((void **) attrout) = attrin;
If this simple assignment is not sufficient for your attributes, you will need to reassign the attribute-copying function
on relevant keyvals on datatypes with the MPI_Type_keyval_create function.
All MPI routines in Fortran (except for MPI_WTIME and MPI_WTICK) have an additional argument ierr at the end of the argument list. ierr is an integer and has the same meaning as the
return value of the routine in C. In Fortran, MPI routines are subroutines, and are invoked with the call statement.
All MPI objects (e.g., MPI_Datatype, MPI_Comm) are of type INTEGER in Fortran.
MPI_Type_keyval_create
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