/* -*- 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 rc, result;

    int ranks[1];

    MPI_Group group, outgroup;

    MPI_Comm comm;

    MTest_Init(&argc, &argv);

    /* To improve reporting of problems about operations, we

     * change the error handler to errors return */

    MPI_Comm_set_errhandler(MPI_COMM_WORLD, MPI_ERRORS_RETURN);

    while (MTestGetComm(&comm, 1)) {

        if (comm == MPI_COMM_NULL)

            continue;

        MPI_Comm_group(comm, &group);

        rc = MPI_Group_incl(group, 0, 0, &outgroup);

        if (rc) {

            errs++;

            MTestPrintError(rc);

            printf("Error in creating an empty group with (0,0)\n");

            /* Some MPI implementations may reject a null "ranks" pointer */

            rc = MPI_Group_incl(group, 0, ranks, &outgroup);

            if (rc) {

                errs++;

                MTestPrintError(rc);

                printf("Error in creating an empty group with (0,ranks)\n");

            }

        }

        if (outgroup != MPI_GROUP_EMPTY) {

            /* Is the group equivalent to group empty? */

            rc = MPI_Group_compare(outgroup, MPI_GROUP_EMPTY, &result);

            if (result != MPI_IDENT) {

                errs++;

                MTestPrintError(rc);

                printf("Did not create a group equivalent to an empty group\n");

            }

        }

        rc = MPI_Group_free(&group);

        if (rc) {

            errs++;

            MTestPrintError(rc);

        }

        if (outgroup != MPI_GROUP_NULL) {

            rc = MPI_Group_free(&outgroup);

            if (rc) {

                errs++;

                MTestPrintError(rc);

            }

        }

        MTestFreeComm(&comm);

    }

    MTest_Finalize(errs);

    MPI_Finalize();

    return 0;

}