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

/*

 *

 *  (C) 2013 by Argonne National Laboratory.

 *      See COPYRIGHT in top-level directory.

 */

#include <mpi.h>

#include <stdio.h>

#include <stdlib.h>

#include "mpitest.h"

/*

 * This test attempts communication between 2 running processes

 * after another process has failed. The communication should complete

 * successfully.

 */

int main(int argc, char **argv)

{

    int rank, size, errs, toterrs = 0;

    char buf[10];

    MPI_Request request;

    MPI_Init(&argc, &argv);

    MPI_Comm_rank(MPI_COMM_WORLD, &rank;;

    MPI_Comm_size(MPI_COMM_WORLD, &size);

    MPI_Comm_set_errhandler(MPI_COMM_WORLD, MPI_ERRORS_RETURN);

    if (size < 4) {

        fprintf(stderr, "Must run with at least 4 processes\n");

        MPI_Abort(MPI_COMM_WORLD, 1);

    }

    if (rank == 1) {

        exit(EXIT_FAILURE);

    }

    if (rank == 0) {

        errs = MPI_Issend("No Errors", 10, MPI_CHAR, 3, 0, MPI_COMM_WORLD, &request);

        errs += MPI_Wait(&request, MPI_STATUS_IGNORE);

        if (errs) {

            toterrs += errs;

            fprintf(stderr, "An error occurred during the send operation\n");

        }

    }

    if (rank == 3) {

        errs = MPI_Irecv(buf, 10, MPI_CHAR, 0, 0, MPI_COMM_WORLD, &request);

        errs += MPI_Wait(&request, MPI_STATUS_IGNORE);

        if (errs) {

            toterrs += errs;

            fprintf(stderr, "An error occurred during the recv operation\n");

        }

    }

    if (rank == 3) {

        exit(EXIT_FAILURE);

    }

    if (rank == 0) {

        errs = MPI_Issend("No Errors", 10, MPI_CHAR, 2, 0, MPI_COMM_WORLD, &request);

        errs += MPI_Wait(&request, MPI_STATUS_IGNORE);

        if (errs) {

            toterrs += errs;

            fprintf(stderr, "An error occurred during the send operation\n");

        }

    }

    if (rank == 2) {

        errs = MPI_Irecv(buf, 10, MPI_CHAR, 0, 0, MPI_COMM_WORLD, &request);

        errs += MPI_Wait(&request, MPI_STATUS_IGNORE);

        if (errs) {

            toterrs += errs;

            fprintf(stderr, "An error occurred during the recv operation\n");

        } else {

            printf(" %s\n", buf);

            fflush(stdout);

        }

    }

    if (rank == 2) {

        exit(EXIT_FAILURE);

    }

    MPI_Finalize();

    return MTestReturnValue(toterrs);

}