/* -*- 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 "mpitest.h"

#include "mpicolltest.h"

/*

static char MTEST_Descrip[] = "Simple intercomm barrier test";

*/

/* This only checks that the Barrier operation accepts intercommunicators.

   It does not check for the semantics of a intercomm barrier (all processes

   in the local group can exit when (but not before) all processes in the

   remote group enter the barrier */

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

{

    int errs = 0, err;

    int leftGroup;

    MPI_Comm comm;

    MPI_Datatype datatype;

    MTest_Init(&argc, &argv);

    datatype = MPI_INT;

    /* Get an intercommunicator */

    while (MTestGetIntercomm(&comm, &leftGroup, 4)) {

        if (comm == MPI_COMM_NULL)

            continue;

        /* To improve reporting of problems about operations, we

         * change the error handler to errors return */

        MPI_Comm_set_errhandler(comm, MPI_ERRORS_RETURN);

        if (leftGroup) {

            err = MTest_Barrier(comm);

            if (err) {

                errs++;

                MTestPrintError(err);

            }

        } else {

            /* In the right group */

            err = MTest_Barrier(comm);

            if (err) {

                errs++;

                MTestPrintError(err);

            }

        }

        MTestFreeComm(&comm);

    }

    MTest_Finalize(errs);

    return MTestReturnValue(errs);

}