/* -*- 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 allgather test";

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

{

    int errs = 0;

    int *rbuf = 0, *sbuf = 0;

    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 */

	    /* The left group will send rank to the right group;

	       The right group will send -rank to the left group */

	    rank = comm.Get_rank();

	    rsize = comm.Get_remote_size();

	    rbuf = new int [ count * rsize ];

	    sbuf = new int [ count ];

	    for (i=0; i

	    if (leftGroup) {

		for (i=0; i

	    }

	    else {

		for (i=0; i

	    }

	    try

	    {

		comm.Allgather( sbuf, count, datatype, rbuf, count, datatype );

	    }

	    catch (MPI::Exception e)

	    {

		errs++;

 		MTestPrintError( e.Get_error_code() );

	    }

	    if (leftGroup) {

		for (i=0; i

		    if (rbuf[i] != -i) {

			errs++;

		    }

		}

	    }

	    else {

		for (i=0; i

		    if (rbuf[i] != i) {

			errs++;

		    }

		}

	    }

	    /* Use Allgather in a unidirectional way */

	    for (i=0; i

	    if (leftGroup) {

		try

		{

		    comm.Allgather( sbuf, 0, datatype, rbuf, count, datatype );

		}

		catch (MPI::Exception e)

		{

		    errs++;

		    MTestPrintError( e.Get_error_code() );

		}

		for (i=0; i

		    if (rbuf[i] != -i) {

			errs++;

		    }

		}

	    }

	    else {

		try

		{

		    comm.Allgather( sbuf, count, datatype, rbuf, 0, datatype );

		}

		catch (MPI::Exception e)

		{

		    errs++;

		    MTestPrintError( e.Get_error_code() );

		}

		for (i=0; i

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

			errs++;

		    }

		}

	    }

	    delete [] rbuf;

	    delete [] sbuf;

	}

        MTestFreeComm(comm);

    }

    MTest_Finalize( errs );

    MPI::Finalize();

    return 0;

}