/* -*- Mode: C; c-basic-offset:4 ; indent-tabs-mode:nil ; -*- */
/*
 *
 *  (C) 2003 by Argonne National Laboratory.
 *      See COPYRIGHT in top-level directory.
 */
#include "mpi.h"
#include <stdio.h>
#include "mpitest.h"

int main(int argc, char *argv[])
{
    int errs = 0;
    int size, rank;
    int dims[2], periods[2];
    MPI_Comm comm;

    MTest_Init(&argc, &argv);

    /* Create a new cartesian communicator in a subset of the processes */
    MPI_Comm_size(MPI_COMM_WORLD, &size);
    MPI_Comm_rank(MPI_COMM_WORLD, &rank);
    if (size < 2) {
        fprintf(stderr, "This test needs at least 2 processes\n");
        MPI_Abort(MPI_COMM_WORLD, 1);
    }
    dims[0] = size - 1;
    periods[0] = 1;
    MPI_Cart_create(MPI_COMM_WORLD, 1, dims, periods, 0, &comm);

    if (comm != MPI_COMM_NULL) {
        int csize;
        MPI_Comm_size(comm, &csize);
        if (csize != dims[0]) {
            errs++;
            fprintf(stderr,
                    "Sizes is wrong in cart communicator.  Is %d, should be %d\n", csize, dims[0]);
        }
        MPI_Barrier(comm);

        MPI_Comm_free(&comm);
    }
    else if (rank < dims[0]) {
        errs++;
        fprintf(stderr, "Communicator returned is null!");
    }

    MTest_Finalize(errs);

    MPI_Finalize();

    return 0;
}
