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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 (c) 2010 Cisco Systems, Inc. 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_count = PMPI_Get_count
#endif
#if OMPI_PROFILING_DEFINES
#include "ompi/mpi/c/profile/defines.h"
#endif
static const char FUNC_NAME[] = "MPI_Get_count";
int MPI_Get_count(MPI_Status *status, MPI_Datatype datatype, int *count)
{
size_t size = 0, internal_count;
int rc = MPI_SUCCESS;
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) {
OMPI_ERR_INIT_FINALIZE(FUNC_NAME);
OMPI_CHECK_DATATYPE_FOR_RECV(rc, datatype, 1);
OMPI_ERRHANDLER_CHECK(rc, MPI_COMM_WORLD, rc, FUNC_NAME);
}
if( ompi_datatype_type_size( datatype, &size ) == MPI_SUCCESS ) {
if( size == 0 ) {
*count = 0;
} else {
internal_count = status->_ucount / size; /* count the number of complete datatypes */
if( (internal_count * size) != status->_ucount ) {
*count = MPI_UNDEFINED;
} else 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 OMPI_ERRHANDLER_INVOKE(MPI_COMM_WORLD, MPI_ERR_TRUNCATE, FUNC_NAME);
} else {
*count = (int)internal_count;
}
}
}
return MPI_SUCCESS;
}
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