/* -*- Mode: C++; c-basic-offset:4 ; -*- */

/*

 *  (C) 2003 by Argonne National Laboratory.

 *      See COPYRIGHT in top-level directory.

 */

#include "mpi.h"

#include <iostream>

#include "mpitestconf.h"

#include "mpitestcxx.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;

    int leftGroup;

    MPI::Intercomm comm;

    MPI::Datatype datatype;

    MTest_Init( );

    datatype = MPI::INT;

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

        if (comm == MPI::COMM_NULL) continue;

	/* Get an intercommunicator */

	if (leftGroup) {

	    try

	    {

		comm.Barrier( );

	    }

	    catch (MPI::Exception e)

	    {

		errs++;

		MTestPrintError( e.Get_error_code() );

	    }

	}

	else {

	    /* In the right group */

	    try

	    {

		comm.Barrier();

	    }

	    catch (MPI::Exception e)

	    {

		errs++;

		MTestPrintError( e.Get_error_code() );

	    }

	}

        MTestFreeComm(comm);

    }

    MTest_Finalize( errs );

    MPI::Finalize();

    return 0;

}