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

/*

 *  (C) 2001 by Argonne National Laboratory.

 *      See COPYRIGHT in top-level directory.

 */

#include "mpi.h"

#include <stdio.h>

#include "mpitest.h"

void addem(int *, int *, int *, MPI_Datatype *);

void addem(int *invec, int *inoutvec, int *len, MPI_Datatype * dtype)

{

    int i;

    for (i = 0; i < *len; i++)

        inoutvec[i] += invec[i];

}

int main(int argc, char **argv)

{

    int rank, size, i;

    int data;

    int errors = 0;

    int result = -100;

    int correct_result;

    MPI_Op op;

    MTest_Init(&argc, &argv);

    MPI_Comm_rank(MPI_COMM_WORLD, &rank;;

    MPI_Comm_size(MPI_COMM_WORLD, &size);

    data = rank;

    MPI_Op_create((MPI_User_function *) addem, 1, &op);

    MPI_Reduce(&data, &result, 1, MPI_INT, op, 0, MPI_COMM_WORLD);

    MPI_Bcast(&result, 1, MPI_INT, 0, MPI_COMM_WORLD);

    MPI_Op_free(&op);

    correct_result = 0;

    for (i = 0; i < size; i++)

        correct_result += i;

    if (result != correct_result)

        errors++;

    MTest_Finalize(errors);

    MPI_Finalize();

    return MTestReturnValue(errors);

}