1
1
openmpi/src/mpi/c/get_elements.c

69 строки
2.0 KiB
C
Исходник Обычный вид История

/*
* Copyright (c) 2004-2005 The Trustees of Indiana University.
* All rights reserved.
* Copyright (c) 2004-2005 The Trustees of the University of Tennessee.
* All rights reserved.
* Copyright (c) 2004-2005 High Performance Computing Center Stuttgart,
* University of Stuttgart. All rights reserved.
* $COPYRIGHT$
*
* Additional copyrights may follow
*
* $HEADER$
*/
#include "ompi_config.h"
#include <stdio.h>
#include "mpi.h"
#include "mpi/c/bindings.h"
#include "communicator/communicator.h"
#include "datatype/datatype.h"
#if OMPI_HAVE_WEAK_SYMBOLS && OMPI_PROFILING_DEFINES
#pragma weak MPI_Get_elements = PMPI_Get_elements
#endif
#if OMPI_PROFILING_DEFINES
#include "mpi/c/profile/defines.h"
#endif
static const char FUNC_NAME[] = "MPI_Get_elements";
int MPI_Get_elements(MPI_Status *status, MPI_Datatype datatype, int *count)
{
int size, i;
if (MPI_PARAM_CHECK) {
OMPI_ERR_INIT_FINALIZE(FUNC_NAME);
}
*count = 0;
if( ompi_ddt_type_size( datatype, &size ) == MPI_SUCCESS ) {
if( size == 0 ) {
return MPI_SUCCESS;
}
*count = status->_count / size;
size = status->_count - (*count) * size;
/* if basic type we should return the same result as MPI_Get_count */
if( (datatype->flags & DT_FLAG_BASIC) == DT_FLAG_BASIC ) {
if( size != 0 ) {
*count = MPI_UNDEFINED;
return OMPI_ERRHANDLER_INVOKE(MPI_COMM_WORLD, MPI_ERR_ARG, FUNC_NAME);
}
return MPI_SUCCESS;
}
if( (*count) != 0 ) {
int total; /* count the basic elements in the datatype */
for( i = 4, total = 0; i < DT_MAX_PREDEFINED; i++ )
total += datatype->btypes[i];
*count = total * (*count);
}
if( size > 0 ) {
*count += ompi_ddt_get_element_count( datatype, size );
}
return MPI_SUCCESS;
}
return OMPI_ERRHANDLER_INVOKE(MPI_COMM_WORLD, MPI_ERR_ARG, FUNC_NAME);
}