/* -*- 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 gatherv test";

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

{

    int errs = 0;

    int *buf = 0;

    int *recvcounts;

    int *recvdispls;

    int leftGroup, i, count, rank, rsize;

    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 */

	    rsize = comm.Get_remote_size();

	    recvcounts = new int [ rsize ];

	    recvdispls = new int [ rsize ];

	    /* This simple test duplicates the Gather test, 

	       using the same lengths for all messages */

	    for (i=0; i

		recvcounts[i] = count;

		recvdispls[i] = count * i;

	    }

	    if (leftGroup) {

		rank = comm.Get_rank();

		buf = new int [count * rsize];

		for (i=0; i

		try

		{

    		    comm.Gatherv( NULL, 0, datatype,

    				  buf, recvcounts, recvdispls, 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 

		   broadcast */

		if (rank != 0) {

		    for (i=0; i

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

			    errs++;

			}

		    }

		}

		else {

		    /* Check for the correct data */

		    for (i=0; i

			if (buf[i] != i) {

			    errs++;

			}

		    }

		}

	    }

	    else {

		int size;

		/* In the right group */

		rank = comm.Get_rank();

		size = comm.Get_size();

		buf = new int [count];

		for (i=0; i

		try

		{

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

		}

		catch (MPI::Exception e)

		{

		    errs++;

		    MTestPrintError( e.Get_error_code() );

		}

	    }

	    delete [] buf;

	    delete [] recvcounts;

	    delete [] recvdispls;

	}

        MTestFreeComm(comm);

    }

    MTest_Finalize( errs );

    MPI::Finalize();

    return 0;

}