106 строки
3.6 KiB
C
106 строки
3.6 KiB
C
/*
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* Copyright (c) 2004-2007 The Trustees of Indiana University and Indiana
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* University Research and Technology
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* Corporation. All rights reserved.
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* Copyright (c) 2004-2005 The University of Tennessee and The University
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* of Tennessee Research Foundation. All rights
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* reserved.
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* Copyright (c) 2004-2008 High Performance Computing Center Stuttgart,
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* University of Stuttgart. All rights reserved.
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* Copyright (c) 2004-2005 The Regents of the University of California.
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* All rights reserved.
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* $COPYRIGHT$
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*
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* Additional copyrights may follow
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*
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* $HEADER$
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*/
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#include "ompi_config.h"
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#include <stdio.h>
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#include "ompi/mpi/c/bindings.h"
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#include "ompi/runtime/params.h"
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#include "ompi/communicator/communicator.h"
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#include "ompi/errhandler/errhandler.h"
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#include "ompi/datatype/ompi_datatype.h"
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#include "ompi/memchecker.h"
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#if OPAL_HAVE_WEAK_SYMBOLS && OMPI_PROFILING_DEFINES
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#pragma weak MPI_Get_elements = PMPI_Get_elements
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#endif
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#if OMPI_PROFILING_DEFINES
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#include "ompi/mpi/c/profile/defines.h"
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#endif
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static const char FUNC_NAME[] = "MPI_Get_elements";
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int MPI_Get_elements(MPI_Status *status, MPI_Datatype datatype, int *count)
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{
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int i;
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size_t size;
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OPAL_CR_NOOP_PROGRESS();
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MEMCHECKER(
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if (status != MPI_STATUSES_IGNORE) {
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/*
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* Before checking the complete status, we need to reset the definedness
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* of the MPI_ERROR-field (single-completion calls wait/test).
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*/
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opal_memchecker_base_mem_defined(&status->MPI_ERROR, sizeof(int));
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memchecker_status(status);
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memchecker_datatype(datatype);
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}
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);
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if (MPI_PARAM_CHECK) {
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int err = MPI_SUCCESS;
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OMPI_ERR_INIT_FINALIZE(FUNC_NAME);
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if (NULL == status || MPI_STATUSES_IGNORE == status ||
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MPI_STATUS_IGNORE == status || NULL == count) {
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err = MPI_ERR_ARG;
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} else if (NULL == datatype || MPI_DATATYPE_NULL == datatype) {
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err = MPI_ERR_TYPE;
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} else {
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OMPI_CHECK_DATATYPE_FOR_RECV(err, datatype, 1);
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}
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OMPI_ERRHANDLER_CHECK(err, MPI_COMM_WORLD, err, FUNC_NAME);
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}
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*count = 0;
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if( ompi_datatype_type_size( datatype, &size ) == MPI_SUCCESS ) {
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if( size == 0 ) {
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/* If the size of the datatype is zero let's return a count of zero */
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return MPI_SUCCESS;
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}
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*count = (int)(status->_count / size); /* how many full types? */
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size = status->_count - (*count) * size; /* leftover bytes */
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/* if basic type we should return the same result as MPI_Get_count */
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if( ompi_datatype_is_predefined(datatype) ) {
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if( size != 0 ) { /* no leftover is supported for predefined types */
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*count = MPI_UNDEFINED;
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}
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return MPI_SUCCESS;
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}
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if( (*count) != 0 ) {
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int total; /* count the basic elements in the datatype */
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for( i = 4, total = 0; i < OMPI_DATATYPE_MAX_PREDEFINED; i++ )
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total += datatype->super.btypes[i];
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*count = total * (*count);
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}
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if( size > 0 ) {
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/* If there are any leftover bytes, compute the number of predefined
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* types in the datatype that can fit in these bytes.
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*/
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if( (i = ompi_datatype_get_element_count( datatype, size )) != -1 )
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*count += i;
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else
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*count = MPI_UNDEFINED;
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}
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return MPI_SUCCESS;
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}
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return OMPI_ERRHANDLER_INVOKE(MPI_COMM_WORLD, MPI_ERR_ARG, FUNC_NAME);
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}
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