146 строки
5.1 KiB
C
146 строки
5.1 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 (c) 2006-2007 Cisco Systems, Inc. All rights reserved.
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* Copyright (c) 2008 University of Houston. All rights reserved.
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* Copyright (c) 2008 Sun Microsystems, 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/datatype/datatype.h"
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#include "ompi/memchecker.h"
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#if OMPI_HAVE_WEAK_SYMBOLS && OMPI_PROFILING_DEFINES
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#pragma weak MPI_Gather = PMPI_Gather
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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_Gather";
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int MPI_Gather(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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MEMCHECKER(
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memchecker_datatype(sendtype);
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memchecker_datatype(recvtype);
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memchecker_call(&opal_memchecker_base_isdefined, sendbuf, sendcount, sendtype);
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memchecker_comm(comm);
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);
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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 == sendbuf) ||
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(ompi_comm_rank(comm) == root && MPI_IN_PLACE == recvbuf)) {
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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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return OMPI_ERRHANDLER_INVOKE(comm, MPI_ERR_ROOT, FUNC_NAME);
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}
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if (MPI_IN_PLACE != sendbuf) {
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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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/* 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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if (ompi_comm_rank(comm) == root) {
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if (MPI_DATATYPE_NULL == recvtype || NULL == recvtype) {
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return OMPI_ERRHANDLER_INVOKE(comm, MPI_ERR_TYPE, FUNC_NAME);
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}
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if (recvcount < 0) {
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return OMPI_ERRHANDLER_INVOKE(comm, MPI_ERR_COUNT, FUNC_NAME);
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}
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}
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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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return OMPI_ERRHANDLER_INVOKE(comm, MPI_ERR_ROOT, FUNC_NAME);
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}
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/* Errors for the senders */
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if (MPI_ROOT != root && MPI_PROC_NULL != root) {
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OMPI_CHECK_DATATYPE_FOR_SEND(err, sendtype, sendcount);
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OMPI_ERRHANDLER_CHECK(err, comm, err, FUNC_NAME);
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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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if (recvcount < 0) {
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return OMPI_ERRHANDLER_INVOKE(comm, MPI_ERR_COUNT, FUNC_NAME);
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}
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if (MPI_DATATYPE_NULL == recvtype || NULL == recvtype) {
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return OMPI_ERRHANDLER_INVOKE(comm, MPI_ERR_TYPE, FUNC_NAME);
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}
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}
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}
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}
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/* Do we need to do anything? */
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if ((0 == sendcount && MPI_ROOT != root &&
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(ompi_comm_rank(comm) != root ||
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(ompi_comm_rank(comm) == root && MPI_IN_PLACE != sendbuf))) ||
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(ompi_comm_rank(comm) == root && MPI_IN_PLACE == sendbuf &&
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0 == recvcount) ||
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(0 == recvcount && (MPI_ROOT == root || MPI_PROC_NULL == root))) {
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return MPI_SUCCESS;
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}
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OPAL_CR_ENTER_LIBRARY();
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/* Invoke the coll component to perform the back-end operation */
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err = comm->c_coll.coll_gather(sendbuf, sendcount, sendtype, recvbuf,
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recvcount, recvtype, root, comm,
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comm->c_coll.coll_gather_module);
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OMPI_ERRHANDLER_RETURN(err, comm, err, FUNC_NAME);
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}
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