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

/*

 *  (C) 2007 by Argonne National Laboratory.

 *      See COPYRIGHT in top-level directory.

 */

#include <stdio.h>

#include <stdlib.h>

#include <mpi.h>

#include "mpitest.h"

/* Test that comm_split fails gracefully when the number of communicators

   is exhausted.  Original version submitted by Paul Sack.

*/

#define MAX_COMMS 2000

/* Define VERBOSE to get an output line for every communicator */

/* #define VERBOSE 1 */

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

{

    int i, rank;

    int rc, maxcomm;

    int errs = 0;

    MPI_Comm comm[MAX_COMMS];

    MTest_Init(&argc, &argv);

    MPI_Comm_rank(MPI_COMM_WORLD, &rank;;

    MPI_Errhandler_set(MPI_COMM_WORLD, MPI_ERRORS_RETURN);

    maxcomm = -1;

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

#ifdef VERBOSE

        if (rank == 0) {

            if (i % 20 == 0) {

                fprintf(stderr, "\n %d: ", i);

                fflush(stdout);

            }

            else {

                fprintf(stderr, ".");

                fflush(stdout);

            }

        }

#endif

        rc = MPI_Comm_split(MPI_COMM_WORLD, 1, rank, &comm[i]);

        if (rc != MPI_SUCCESS) {

            break;

        }

        maxcomm = i;

    }

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

        MPI_Comm_free(&comm[i]);

    }

    /* If we complete, there are no errors */

    MTest_Finalize(errs);

    MPI_Finalize();

    return 0;

}