/* -*- 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"

/*

static char MTEST_Descrip[] = "Simple test of intercommunicator send and receive";

*/

int main(int argc, char *argv[])

{

    int errs = 0;

    int leftGroup, buf, rank, remote_size, i;

    MPI_Comm comm;

    MPI_Status status;

    MTest_Init(&argc, &argv);

    while (MTestGetIntercomm(&comm, &leftGroup, 4)) {

        if (comm == MPI_COMM_NULL)

            continue;

        if (leftGroup) {

            MPI_Comm_rank(comm, &rank;;

            buf = rank;

            MPI_Send(&buf, 1, MPI_INT, 0, 0, comm);

        }

        else {

            MPI_Comm_remote_size(comm, &remote_size);

            MPI_Comm_rank(comm, &rank;;

            if (rank == 0) {

                for (i = 0; i < remote_size; i++) {

                    buf = -1;

                    MPI_Recv(&buf, 1, MPI_INT, i, 0, comm, &status);

                    if (buf != i) {

                        errs++;

                        fprintf(stderr, "buf = %d, should be %d\n", buf, i);

                    }

                }

            }

        }

        /* Now, reverse it and send back */

        if (!leftGroup) {

            MPI_Comm_rank(comm, &rank;;

            buf = rank;

            MPI_Send(&buf, 1, MPI_INT, 0, 0, comm);

        }

        else {

            MPI_Comm_remote_size(comm, &remote_size);

            MPI_Comm_rank(comm, &rank;;

            if (rank == 0) {

                for (i = 0; i < remote_size; i++) {

                    buf = -1;

                    MPI_Recv(&buf, 1, MPI_INT, i, 0, comm, &status);

                    if (buf != i) {

                        errs++;

                        fprintf(stderr, "buf = %d, should be %d\n", buf, i);

                    }

                }

            }

        }

        MTestFreeComm(&comm);

    }

    MTest_Finalize(errs);

    MPI_Finalize();

    return 0;

}