e08c6e81f5
recvbuf in MPI_GATHER). * Minor style updates (constants on the left of == and !=) * Fix a minor buglet that crept in r11904: had a recvbuf where it should have been recvcount. Thankfully, this would have only affected erroneous programs. ;-) This commit was SVN r11980. The following SVN revision numbers were found above: r11904 --> open-mpi/ompi@17539dc154 The following Trac tickets were found above: Ticket 338 --> https://svn.open-mpi.org/trac/ompi/ticket/338
127 строки
4.3 KiB
C
127 строки
4.3 KiB
C
/*
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* Copyright (c) 2004-2005 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) 2004-2005 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 (c) 2006 Cisco Systems, Inc. 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/mca/coll/coll.h"*/
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#include "ompi/datatype/datatype.h"
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#if OMPI_HAVE_WEAK_SYMBOLS && OMPI_PROFILING_DEFINES
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#pragma weak MPI_Scatter = PMPI_Scatter
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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_Scatter";
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int MPI_Scatter(void *sendbuf, int sendcount, MPI_Datatype sendtype,
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void *recvbuf, int recvcount, MPI_Datatype recvtype,
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int root, MPI_Comm comm)
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{
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int err;
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if (MPI_PARAM_CHECK) {
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err = MPI_SUCCESS;
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OMPI_ERR_INIT_FINALIZE(FUNC_NAME);
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if (ompi_comm_invalid(comm)) {
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return OMPI_ERRHANDLER_INVOKE(MPI_COMM_WORLD, MPI_ERR_COMM,
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FUNC_NAME);
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} else if ((ompi_comm_rank(comm) != root && MPI_IN_PLACE == recvbuf) ||
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(ompi_comm_rank(comm) == root && MPI_IN_PLACE == sendbuf)) {
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return OMPI_ERRHANDLER_INVOKE(comm, MPI_ERR_ARG, FUNC_NAME);
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}
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/* Errors for intracommunicators */
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if (OMPI_COMM_IS_INTRA(comm)) {
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/* Errors for all ranks */
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if ((root >= ompi_comm_size(comm)) || (root < 0)) {
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err = MPI_ERR_ROOT;
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} else if (MPI_IN_PLACE != recvbuf) {
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if (recvcount < 0) {
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err = MPI_ERR_COUNT;
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} else if (MPI_DATATYPE_NULL == recvtype) {
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err = MPI_ERR_TYPE;
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}
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}
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/* Errors for the root. Some of these could have been
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combined into compound if statements above, but since
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this whole section can be compiled out (or turned off at
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run time) for efficiency, it's more clear to separate
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them out into individual tests. */
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else if (ompi_comm_rank(comm) == root) {
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OMPI_CHECK_DATATYPE_FOR_SEND(err, sendtype, sendcount);
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}
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OMPI_ERRHANDLER_CHECK(err, comm, err, FUNC_NAME);
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}
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/* Errors for intercommunicators */
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else {
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if (! ((root >= 0 && root < ompi_comm_remote_size(comm)) ||
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MPI_ROOT == root || MPI_PROC_NULL == root)) {
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err = MPI_ERR_ROOT;
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}
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/* Errors for the receivers */
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else if (MPI_ROOT != root && MPI_PROC_NULL != root) {
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if (recvcount < 0) {
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err = MPI_ERR_COUNT;
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} else if (MPI_DATATYPE_NULL == recvtype) {
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err = MPI_ERR_TYPE;
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}
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}
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/* Errors for the root. Ditto on the comment above -- these
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error checks could have been combined above, but let's
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make the code easier to read. */
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else if (MPI_ROOT == root) {
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OMPI_CHECK_DATATYPE_FOR_SEND(err, sendtype, sendcount);
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}
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OMPI_ERRHANDLER_CHECK(err, comm, err, FUNC_NAME);
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}
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}
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/* Do we need to do anything? */
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if ((0 == recvcount &&
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(ompi_comm_rank(comm) != root ||
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(ompi_comm_rank(comm) == root && MPI_IN_PLACE != recvbuf))) ||
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(ompi_comm_rank(comm) == root && MPI_IN_PLACE == recvbuf &&
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0 == sendcount)) {
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return MPI_SUCCESS;
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}
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/* Invoke the coll component to perform the back-end operation */
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err = comm->c_coll.coll_scatter(sendbuf, sendcount, sendtype, recvbuf,
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recvcount, recvtype, root, comm);
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OMPI_ERRHANDLER_RETURN(err, comm, err, FUNC_NAME);
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}
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