/*
 * Copyright (c) 2004-2007 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) 2004-2008 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      Cisco Systems, Inc.  All rights reserved.
 * Copyright (c) 2011      Sandia National Laboratories. 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/win/win.h"
#include "ompi/mca/osc/osc.h"
#include "ompi/datatype/ompi_datatype.h"

#if OPAL_HAVE_WEAK_SYMBOLS && OMPI_PROFILING_DEFINES
#pragma weak MPI_Compare_and_swap = PMPI_Compare_and_swap
#endif

#if OMPI_PROFILING_DEFINES
#include "ompi/mpi/c/profile/defines.h"
#endif

static const char FUNC_NAME[] = "MPI_Compare_and_swap";


int MPI_Compare_and_swap(void *origin_addr, void *compare_addr, void *result_addr,
                         MPI_Datatype datatype, int target_rank, MPI_Aint target_disp, MPI_Win win) 
{
    int rc;

    if (MPI_PARAM_CHECK) {
        rc = OMPI_SUCCESS;

        OMPI_ERR_INIT_FINALIZE(FUNC_NAME);

        if (ompi_win_invalid(win)) {
            return OMPI_ERRHANDLER_INVOKE(MPI_COMM_WORLD, MPI_ERR_WIN, FUNC_NAME);
        } else if (ompi_win_peer_invalid(win, target_rank) &&
                   (MPI_PROC_NULL != target_rank)) {
            rc = MPI_ERR_RANK;
        } else if ( target_disp < 0 ) {
            rc = MPI_ERR_DISP;
        } else {
            OMPI_CHECK_DATATYPE_FOR_ONE_SIDED(rc, datatype, 1);
        }
        OMPI_ERRHANDLER_CHECK(rc, win, rc, FUNC_NAME);
    }

    if (MPI_PROC_NULL == target_rank) return MPI_SUCCESS;

    OPAL_CR_ENTER_LIBRARY();

    rc = win->w_osc_module->osc_compare_and_swap(origin_addr, compare_addr, result_addr,
                                                 datatype, target_rank, target_disp, win);
    OMPI_ERRHANDLER_RETURN(rc, win, rc, FUNC_NAME);
}