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/*
* Copyright (c) 2004-2007 The Trustees of Indiana University and Indiana
* University Research and Technology
* Corporation. All rights reserved.
* Copyright (c) 2004-2010 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.
* $COPYRIGHT$
*
* Additional copyrights may follow
*
* $HEADER$
*/
#include "ompi_config.h"
#include <stdio.h>
#include <limits.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 "ompi/memchecker.h"
#if OPAL_HAVE_WEAK_SYMBOLS && OMPI_PROFILING_DEFINES
#pragma weak MPI_Get_elements = PMPI_Get_elements
#endif
#if OMPI_PROFILING_DEFINES
#include "ompi/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)
{
size_t size, internal_count;
int i;
OPAL_CR_NOOP_PROGRESS();
MEMCHECKER(
if (status != MPI_STATUSES_IGNORE) {
/*
* Before checking the complete status, we need to reset the definedness
* of the MPI_ERROR-field (single-completion calls wait/test).
*/
opal_memchecker_base_mem_defined(&status->MPI_ERROR, sizeof(int));
memchecker_status(status);
memchecker_datatype(datatype);
}
);
if (MPI_PARAM_CHECK) {
int err = MPI_SUCCESS;
OMPI_ERR_INIT_FINALIZE(FUNC_NAME);
if (NULL == status || MPI_STATUSES_IGNORE == status ||
MPI_STATUS_IGNORE == status || NULL == count) {
err = MPI_ERR_ARG;
} else if (NULL == datatype || MPI_DATATYPE_NULL == datatype) {
err = MPI_ERR_TYPE;
} else {
OMPI_CHECK_DATATYPE_FOR_RECV(err, datatype, 1);
}
OMPI_ERRHANDLER_CHECK(err, MPI_COMM_WORLD, err, FUNC_NAME);
}
*count = 0;
if( ompi_datatype_type_size( datatype, &size ) == MPI_SUCCESS ) {
if( size == 0 ) {
/* If the size of the datatype is zero let's return a count of zero */
return MPI_SUCCESS;
}
internal_count = status->_ucount / size; /* how many full types? */
size = status->_ucount - internal_count * size; /* leftover bytes */
/* if basic type we should return the same result as MPI_Get_count */
if( ompi_datatype_is_predefined(datatype) ) {
if( size != 0 ) { /* no leftover is supported for predefined types */
*count = MPI_UNDEFINED;
}
goto more_than_int_elements;
}
if( internal_count != 0 ) {
size_t total = 0; /* count the basic elements in the datatype */
for( i = 4; i < OPAL_DATATYPE_MAX_PREDEFINED; i++ ) {
total += datatype->super.btypes[i];
}
internal_count = total * internal_count;
}
if( size > 0 ) {
/* If there are any leftover bytes, compute the number of predefined
* types in the datatype that can fit in these bytes.
*/
if( (i = ompi_datatype_get_element_count( datatype, size )) != -1 )
internal_count += i;
else {
*count = MPI_UNDEFINED;
return MPI_SUCCESS;
}
}
goto more_than_int_elements;
}
return OMPI_ERRHANDLER_INVOKE(MPI_COMM_WORLD, MPI_ERR_ARG, FUNC_NAME);
more_than_int_elements:
if( internal_count > ((size_t)INT_MAX) ) {
/* We have more elements that we can represent with a signed int, and therefore
* we're outside the standard here. I don't see what should we report back
* here to make it useful. So, let's return an untouched *count and trigger
* an MPI_ERR_TRUNCATE.
*/
return MPI_ERR_TRUNCATE;
}
*count = (int)internal_count;
return MPI_SUCCESS;
}
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