/* -*- 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 <stdlib.h>

#include <string.h>

#include "mpitest.h"

/*

 * This test attempts collective communication after a process in

 * the communicator has failed.

 */

int main(int argc, char **argv)

{

    int rank, size, i, rc, errclass, toterrs, errs = 0;

    char rbuf[100000];

    char *sendbuf;

    int deadprocs[1] = { 1 };

    MPI_Group world, newgroup;

    MPI_Comm newcomm;

    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 < 3) {

        fprintf(stderr, "Must run with at least 3 processes\n");

        MPI_Abort(MPI_COMM_WORLD, 1);

    }

    MPI_Comm_group(MPI_COMM_WORLD, &world);

    MPI_Group_excl(world, 1, deadprocs, &newgroup);

    MPI_Comm_create_group(MPI_COMM_WORLD, newgroup, 0, &newcomm);

    if (rank == 1) {

        exit(EXIT_FAILURE);

    }

    /* try a small send first */

    sendbuf = (char *) malloc(10 * size * sizeof(char));

    if (rank == 0) {

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

            strcpy(sendbuf + i * 10, "No Errors");

        }

    }

    rc = MPI_Scatter(sendbuf, 10, MPI_CHAR, rbuf, 10, MPI_CHAR, 0, MPI_COMM_WORLD);

#if defined (MPICH) && (MPICH_NUMVERSION >= 30100102)

    MPI_Error_class(rc, &errclass);

    if ((rc) && (errclass != MPIX_ERR_PROC_FAILED)) {

        fprintf(stderr, "Wrong error code (%d) returned. Expected MPIX_ERR_PROC_FAILED\n",

                errclass);

        errs++;

    }

#endif

    /* reset the buffers and try a larger scatter */

    free(sendbuf);

    memset(rbuf, 0, sizeof(rbuf));

    sendbuf = (char *) malloc(100000 * size * sizeof(char));

    if (rank == 0) {

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

            strcpy(sendbuf + i * 100000, "No Errors");

        }

    }

    rc = MPI_Scatter(sendbuf, 100000, MPI_CHAR, rbuf, 100000, MPI_CHAR, 0, MPI_COMM_WORLD);

#if defined (MPICH) && (MPICH_NUMVERSION >= 30100102)

    MPI_Error_class(rc, &errclass);

    if ((rc) && (errclass != MPIX_ERR_PROC_FAILED)) {

        fprintf(stderr, "Wrong error code (%d) returned. Expected MPIX_ERR_PROC_FAILED\n",

                errclass);

        errs++;

    }

#endif

    rc = MPI_Reduce(&errs, &toterrs, 1, MPI_INT, MPI_SUM, 0, newcomm);

    if (rc)

        fprintf(stderr, "Failed to get errors from other processes\n");

    if (rank == 0) {

        if (toterrs) {

            printf(" Found %d errors\n", toterrs);

        } else {

            printf(" No Errors\n");

        }

        fflush(stdout);

    }

    free(sendbuf);

    MPI_Comm_free(&newcomm);

    MPI_Group_free(&newgroup);

    MPI_Group_free(&world);

    MPI_Finalize();

    return MTestReturnValue(errs);

}