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/*
* Copyright (c) 2004-2006 The Trustees of Indiana University and Indiana
* University Research and Technology
* Corporation. All rights reserved.
* Copyright (c) 2004-2005 The University of Tennessee and The University
* of Tennessee Research Foundation. All rights
* reserved.
* Copyright (c) 2004-2005 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) 2006 Cisco Systems, Inc. All rights reserved.
* $COPYRIGHT$
*
* Additional copyrights may follow
*
* $HEADER$
*/
#include "ompi_config.h"
#include <stdio.h>
#include "ompi/mpi/c/bindings.h"
#include "ompi/datatype/datatype.h"
#include "ompi/op/op.h"
#if OMPI_HAVE_WEAK_SYMBOLS && OMPI_PROFILING_DEFINES
#pragma weak MPI_Reduce = PMPI_Reduce
#endif
#if OMPI_PROFILING_DEFINES
#include "ompi/mpi/c/profile/defines.h"
#endif
static const char FUNC_NAME[] = "MPI_Reduce";
int MPI_Reduce(void *sendbuf, void *recvbuf, int count,
MPI_Datatype datatype, MPI_Op op, int root, MPI_Comm comm)
{
int err;
if (MPI_PARAM_CHECK) {
char *msg;
err = MPI_SUCCESS;
OMPI_ERR_INIT_FINALIZE(FUNC_NAME);
if (ompi_comm_invalid(comm)) {
return OMPI_ERRHANDLER_INVOKE(MPI_COMM_WORLD, MPI_ERR_COMM,
FUNC_NAME);
}
/* Checks for all ranks */
else if (MPI_OP_NULL == op) {
err = MPI_ERR_OP;
} else if (!ompi_op_is_valid(op, datatype, &msg, FUNC_NAME)) {
int ret = OMPI_ERRHANDLER_INVOKE(comm, MPI_ERR_OP, msg);
free(msg);
return ret;
} else if ((ompi_comm_rank(comm) != root && MPI_IN_PLACE == sendbuf) ||
(ompi_comm_rank(comm) == root && MPI_IN_PLACE == recvbuf)) {
err = MPI_ERR_ARG;
} else {
OMPI_CHECK_DATATYPE_FOR_SEND(err, datatype, count);
}
OMPI_ERRHANDLER_CHECK(err, comm, err, FUNC_NAME);
/* Intercommunicator errors */
if (!OMPI_COMM_IS_INTRA(comm)) {
if (! ((root >= 0 && root < ompi_comm_remote_size(comm)) ||
MPI_ROOT == root || MPI_PROC_NULL == root)) {
return OMPI_ERRHANDLER_INVOKE(comm, MPI_ERR_ROOT, FUNC_NAME);
}
}
/* Intracommunicator errors */
else {
if (root < 0 || root >= ompi_comm_size(comm)) {
return OMPI_ERRHANDLER_INVOKE(comm, MPI_ERR_ROOT, FUNC_NAME);
}
}
}
/* Do we need to do anything? (MPI says that reductions have to
have a count of at least 1, but at least IMB calls reduce with
a count of 0 -- blah!) */
if (0 == count) {
return MPI_SUCCESS;
}
/* Invoke the coll component to perform the back-end operation */
OBJ_RETAIN(op);
err = comm->c_coll.coll_reduce(sendbuf, recvbuf, count,
datatype, op, root, comm);
OBJ_RELEASE(op);
OMPI_ERRHANDLER_RETURN(err, comm, err, FUNC_NAME);
}
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