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

/*

 *

 *  (C) 2003 by Argonne National Laboratory.

 *      See COPYRIGHT in top-level directory.

 */

#include "mpi.h"

#include "mpitestconf.h"

#ifdef HAVE_IOSTREAM

// Not all C++ compilers have iostream instead of iostream.h

#include <iostream>

#ifdef HAVE_NAMESPACE_STD

// Those that do often need the std namespace; otherwise, a bare "cout"

// is likely to fail to compile

using namespace std;

#endif

#else

#include <iostream.h>

#endif

#include "mpitestcxx.h"

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

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

{

    int errs = 0;

    int *buf = 0;

    int leftGroup, i, count, rank;

    MPI::Intercomm comm;

    MPI::Datatype datatype;

    MTest_Init( );

    datatype = MPI::INT;

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

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

	for (count = 1; count < 65000; count = 2 * count) {

	    /* Get an intercommunicator */

	    buf = 0;

	    if (leftGroup) {

		int rsize;

		rsize = comm.Get_remote_size();

		rank  = comm.Get_rank();

		buf = new int [ count * rsize ];

		if (rank == 0) {

		    for (i=0; i

		}

		else {

		    for (i=0; i

		}

		try

		{

		    comm.Scatter( buf, count, datatype, 

			NULL, 0, datatype,

			(rank == 0) ? MPI::ROOT : MPI::PROC_NULL );

		}

		catch (MPI::Exception e)

		{

		    errs++;

		    MTestPrintError( e.Get_error_code() );

		}

		/* Test that no other process in this group received the 

		   scatter */

		if (rank != 0) {

		    for (i=0; i

			if (buf[i] != -1) {

			    if (errs < 10) {

				cout << "Received data on root group!\n";

			    }

			    errs++;

			}

		    }

		}

	    }

	    else {

		int rank, size;

		rank = comm.Get_rank();

		size = comm.Get_size();

		buf = new int [ count ];

		/* In the right group */

		for (i=0; i

		try

		{

		    comm.Scatter( NULL, 0, datatype, buf, count, datatype, 0 );

		}

		catch (MPI::Exception e)

		{

		    errs++;

		    MTestPrintError( e.Get_error_code() );

		}

		/* Check that we have received the correct data */

		for (i=0; i

		    if (buf[i] != i + rank * count) {

			if (errs < 10) 

			    cout << "buf[" << i << "] = " << buf[i] <<

				" on " << rank << "\n";

			errs++;

		    }

		}

	    }

	    delete [] buf;

	}

        MTestFreeComm(comm);

    }

    MTest_Finalize( errs );

    MPI::Finalize();

    return 0;

}