/* -*- 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 reduce test";

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

{

    int errs = 0;

    int *sendbuf = 0, *recvbuf=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) {

	    sendbuf = new int [count];

	    recvbuf = new int [count];

	    /* Get an intercommunicator */

	    for (i=0; i

		sendbuf[i] = -1;

		recvbuf[i] = -1;

	    }

	    if (leftGroup) {

		rank = comm.Get_rank();

		try

		{

		    comm.Reduce( sendbuf, recvbuf, count, datatype, MPI::SUM,

			(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 

		   broadcast, and that we got the right answers */

		if (rank == 0) {

		    int rsize;

		    rsize = comm.Get_remote_size();

		    for (i=0; i

			if (recvbuf[i] != i * rsize) {

			    errs++;

			}

		    }

		}

		else {

		    for (i=0; i

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

			    errs++;

			}

		    }

		}

	    }

	    else {

		/* In the right group */

		for (i=0; i

		try

		{

		    comm.Reduce( sendbuf, recvbuf, count, datatype, MPI::SUM, 0 );

		}

		catch (MPI::Exception e)

		{

		    errs++;

		    MTestPrintError( e.Get_error_code() );

		}

		/* Check that we have received no data */

		for (i=0; i

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

			errs++;

		    }

		}

	    }

	    delete [] sendbuf;

	    delete [] recvbuf;

	}

        MTestFreeComm(comm);

    }

    MTest_Finalize( errs );

    MPI::Finalize();

    return 0;

}