openmpi/src/mpi/c/cart_shift.c

/*
 * $HEADERS$
 */
#include "ompi_config.h"
#include <stdio.h>

#include "mpi.h"
#include "mpi/c/bindings.h"
#include "communicator/communicator.h"
#include "mca/topo/topo.h"
#include "errhandler/errhandler.h"

#if OMPI_HAVE_WEAK_SYMBOLS && OMPI_PROFILING_DEFINES
#pragma weak MPI_Cart_shift = PMPI_Cart_shift
#endif

#if OMPI_PROFILING_DEFINES
#include "mpi/c/profile/defines.h"
#endif

int MPI_Cart_shift(MPI_Comm comm, int direction, int disp,
                   int *rank_source, int *rank_dest) {
    int err;
    mca_topo_base_cart_shift_fn_t func;

    /* check the arguments */
    if (MPI_PARAM_CHECK) {
        if (MPI_COMM_NULL == comm) {
            return OMPI_ERRHANDLER_INVOKE (MPI_COMM_WORLD, MPI_ERR_COMM,
                                          "MPI_Cart_shift");
        }
        if (OMPI_COMM_IS_INTER(comm)) { 
            return OMPI_ERRHANDLER_INVOKE (MPI_COMM_WORLD, MPI_ERR_COMM,
                                          "MPI_Cart_shift");
        }
        if (!OMPI_COMM_IS_CART(comm)) {
            return OMPI_ERRHANDLER_INVOKE (MPI_COMM_WORLD, MPI_ERR_TOPOLOGY,
                                          "MPI_Cart_shift");
        }
        if (0 > direction) { /* yet to detect direction >= comm->c_topo_ndims */
            return OMPI_ERRHANDLER_INVOKE (MPI_COMM_WORLD, MPI_ERR_DIMS,
                                          "MPI_Cart_shift");
        }
        if (NULL == rank_source || NULL == rank_dest) {
            return OMPI_ERRHANDLER_INVOKE (MPI_COMM_WORLD, MPI_ERR_ARG,
                                          "MPI_Cart_shift");
        }
    }

    /* get the function pointer on this communicator */
    func = comm->c_topo.topo_cart_shift;
    if (NULL == func) {
        return OMPI_ERRHANDLER_INVOKE(MPI_COMM_WORLD, MPI_ERR_OTHER, 
                                     "MPI_Cart_shift");
    }
    /* call the function */
    if ( MPI_SUCCESS != 
            (err = func(comm, direction, disp, rank_source, rank_dest))) {
        return OMPI_ERRHANDLER_INVOKE(MPI_COMM_WORLD, err, "MPI_Cart_shift");
    }

    /* all done */
    return MPI_SUCCESS;
}