/* -*- Mode: C; c-basic-offset:4 ; indent-tabs-mode:nil -*- */
/*
 * Copyright (c) 2004-2007 The Trustees of Indiana University and Indiana
 *                         University Research and Technology
 *                         Corporation.  All rights reserved.
 * Copyright (c) 2004-2020 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) 2006-2009 Cisco Systems, Inc.  All rights reserved.
 * Copyright (c) 2013      Los Alamos National Security, LLC.  All rights
 *                         reserved.
 * Copyright (c) 2015      Research Organization for Information Science
 *                         and Technology (RIST). All rights reserved.
 * Copyright (c) 2016-2017 IBM Corporation.  All rights reserved.
 * $COPYRIGHT$
 *
 * Additional copyrights may follow
 *
 * $HEADER$
 */
#include "ompi_config.h"
#include <stdio.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/op/op.h"
#include "ompi/memchecker.h"

#if OMPI_BUILD_MPI_PROFILING
#if OPAL_HAVE_WEAK_SYMBOLS
#pragma weak MPI_Reduce_local = PMPI_Reduce_local
#endif
#define MPI_Reduce_local PMPI_Reduce_local
#endif

static const char FUNC_NAME[] = "MPI_Reduce_local";


int MPI_Reduce_local(const void *inbuf, void *inoutbuf, int count,
                     MPI_Datatype datatype, MPI_Op op)
{
    int err;

    MEMCHECKER(
        memchecker_datatype(datatype);
    );

    if (MPI_PARAM_CHECK) {
        char *msg;
        err = MPI_SUCCESS;
        OMPI_ERR_INIT_FINALIZE(FUNC_NAME);

        if (MPI_OP_NULL == op || NULL == op) {
            err = MPI_ERR_OP;
        } else if (!ompi_op_is_valid(op, datatype, &msg, FUNC_NAME)) {
            int ret = OMPI_ERRHANDLER_NOHANDLE_INVOKE(MPI_ERR_OP, msg);
            free(msg);
            return ret;
        } else {
            OMPI_CHECK_DATATYPE_FOR_SEND(err, datatype, count);
        }
        OMPI_ERRHANDLER_NOHANDLE_CHECK(err, err, FUNC_NAME);
    }

    /* If the count is 0, just return */
    if (0 == count) {
        return MPI_SUCCESS;
    }

    /* Invoke the op component to perform the back-end operation */
    OBJ_RETAIN(op);
    OBJ_RETAIN(datatype);
    // Since there is no 'comm' parameter to this interface use 'self' since
    // this is a local operation to this process.
    ompi_communicator_t *comm = &ompi_mpi_comm_self.comm;
    err = comm->c_coll->coll_reduce_local(inbuf, inoutbuf, count, datatype, op,
                                         comm->c_coll->coll_reduce_local_module);
    OBJ_RELEASE(datatype);
    OBJ_RELEASE(op);

    OMPI_ERRHANDLER_NOHANDLE_RETURN(err, err, FUNC_NAME);
}