/* -*- Mode: C; c-basic-offset:4 ; indent-tabs-mode:nil ; -*- */

/*

 *  (C) 2008 by Argonne National Laboratory.

 *      See COPYRIGHT in top-level directory.

 */

#include "mpi.h"

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

{

    int myrank, size, src = 0, dest = 1;

    int buf[20];

    MPI_Init(0, 0);

    MPI_Comm_size(MPI_COMM_WORLD, &size);

    MPI_Comm_rank(MPI_COMM_WORLD, &myrank);

    if (myrank == src || myrank == dest) {

        int partner = src;

        if (myrank == partner)

            partner = dest;

        MPI_Sendrecv(MPI_BOTTOM, 0, MPI_INT, partner, 0,

                     MPI_BOTTOM, 0, MPI_INT, partner, 0, MPI_COMM_WORLD, MPI_STATUS_IGNORE);

    }

    if (myrank == src) {

        MPI_Send(buf, 20, MPI_INT, dest, 0, MPI_COMM_WORLD);

    } else if (myrank == dest) {

        MPI_Recv(buf, 20, MPI_INT, src, 0, MPI_COMM_WORLD, MPI_STATUS_IGNORE);

    }

    MPI_Finalize();

    return 0;

}