openmpi/ompi/mpi/c/pack_size.c

/*
 * Copyright (c) 2004-2007 The Trustees of Indiana University and Indiana
 *                         University Research and Technology
 *                         Corporation.  All rights reserved.
 * Copyright (c) 2004-2005 The University of Tennessee and The University
 *                         of Tennessee Research Foundation.  All rights
 *                         reserved.
 * Copyright (c) 2004-2008 High Performance Computing Center Stuttgart, 
 *                         University of Stuttgart.  All rights reserved.
 * Copyright (c) 2004-2005 The Regents of the University of California.
 *                         All rights reserved.
 * Copyright (c) 2006      Cisco Systems, Inc.  All rights reserved.
 * $COPYRIGHT$
 * 
 * Additional copyrights may follow
 * 
 * $HEADER$
 */
#include "ompi_config.h"
#include <stdio.h>

#include "ompi/mpi/c/bindings.h"
#include "ompi/runtime/params.h"
#include "ompi/communicator/communicator.h"
#include "ompi/errhandler/errhandler.h"
#include "ompi/datatype/ompi_datatype.h"
#include "opal/datatype/opal_convertor.h"
#include "ompi/memchecker.h"

#if OPAL_HAVE_WEAK_SYMBOLS && OMPI_PROFILING_DEFINES
#pragma weak MPI_Pack_size = PMPI_Pack_size
#endif

#if OMPI_PROFILING_DEFINES
#include "ompi/mpi/c/profile/defines.h"
#endif

static const char FUNC_NAME[] = "MPI_Pack_size";

int MPI_Pack_size(int incount, MPI_Datatype datatype, MPI_Comm comm,
                  int *size) 
{
    opal_convertor_t local_convertor;
    size_t length;

    MEMCHECKER(
        memchecker_datatype(datatype);
        memchecker_comm(comm);
    );

    if (MPI_PARAM_CHECK) {
        OMPI_ERR_INIT_FINALIZE(FUNC_NAME);
        if (ompi_comm_invalid(comm)) {
            return OMPI_ERRHANDLER_INVOKE(MPI_COMM_WORLD, MPI_ERR_COMM,
                                          FUNC_NAME);
        } else if (NULL == size) {
            return OMPI_ERRHANDLER_INVOKE(comm, MPI_ERR_ARG, FUNC_NAME);
        } else if (MPI_DATATYPE_NULL == datatype || NULL == datatype) {
            return OMPI_ERRHANDLER_INVOKE(comm, MPI_ERR_TYPE, FUNC_NAME);
        }
    }

    OPAL_CR_ENTER_LIBRARY();

    OBJ_CONSTRUCT( &local_convertor, opal_convertor_t );
    /* the resulting convertor will be set to the position ZERO */
    opal_convertor_copy_and_prepare_for_send( ompi_mpi_local_convertor, &(datatype->super),
                                              incount, NULL, 0, &local_convertor );

    opal_convertor_get_packed_size( &local_convertor, &length );
    *size = (int)length;
    OBJ_DESTRUCT( &local_convertor );

    OPAL_CR_EXIT_LIBRARY();

    return MPI_SUCCESS;
}