/* -*- 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 rank, size, wrank, wsize, dest, a, b;

    MPI_Comm newcomm;

    MPI_Status status;

    MTest_Init(&argc, &argv);

    /* Can we run comm dup at all? */

    MPI_Comm_dup(MPI_COMM_WORLD, &newcomm);

    /* Check basic properties */

    MPI_Comm_size(MPI_COMM_WORLD, &wsize);

    MPI_Comm_rank(MPI_COMM_WORLD, &wrank);

    MPI_Comm_size(newcomm, &size);

    MPI_Comm_rank(newcomm, &rank;;

    if (size != wsize || rank != wrank) {

        errs++;

        fprintf(stderr, "Size (%d) or rank (%d) wrong\n", size, rank);

        fflush(stderr);

    }

    /* Can we communicate with this new communicator? */

    dest = MPI_PROC_NULL;

    if (rank == 0) {

        dest = size - 1;

        a = rank;

        b = -1;

        MPI_Sendrecv(&a, 1, MPI_INT, dest, 0, &b, 1, MPI_INT, dest, 0, newcomm, &status);

        if (b != dest) {

            errs++;

            fprintf(stderr, "Received %d expected %d on %d\n", b, dest, rank);

            fflush(stderr);

        }

        if (status.MPI_SOURCE != dest) {

            errs++;

            fprintf(stderr, "Source not set correctly in status on %d\n", rank);

            fflush(stderr);

        }

    } else if (rank == size - 1) {

        dest = 0;

        a = rank;

        b = -1;

        MPI_Sendrecv(&a, 1, MPI_INT, dest, 0, &b, 1, MPI_INT, dest, 0, newcomm, &status);

        if (b != dest) {

            errs++;

            fprintf(stderr, "Received %d expected %d on %d\n", b, dest, rank);

            fflush(stderr);

        }

        if (status.MPI_SOURCE != dest) {

            errs++;

            fprintf(stderr, "Source not set correctly in status on %d\n", rank);

            fflush(stderr);

        }

    }

    MPI_Comm_free(&newcomm);

    MTest_Finalize(errs);

    return MTestReturnValue(errs);

}