openmpi/ompi/mpi/c/win_get_attr.c

/*
 * Copyright (c) 2004-2007 The Trustees of Indiana University and Indiana
 *                         University Research and Technology
 *                         Corporation.  All rights reserved.
 * Copyright (c) 2004-2006 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.
 * $COPYRIGHT$
 * 
 * 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/attribute/attribute.h"
#include "ompi/win/win.h"

#if OPAL_HAVE_WEAK_SYMBOLS && OMPI_PROFILING_DEFINES
#pragma weak MPI_Win_get_attr = PMPI_Win_get_attr
#endif

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

static const char FUNC_NAME[] = "MPI_Win_get_attr";


int MPI_Win_get_attr(MPI_Win win, int win_keyval,
                     void *attribute_val, int *flag) 
{
    int ret;

    if (MPI_PARAM_CHECK) {
       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 ((NULL == attribute_val) || (NULL == flag)) {
           return OMPI_ERRHANDLER_INVOKE(win, MPI_ERR_ARG, FUNC_NAME);
        } else if (MPI_KEYVAL_INVALID == win_keyval) {
            return OMPI_ERRHANDLER_INVOKE(win, MPI_ERR_KEYVAL, FUNC_NAME);
       }
    }

    OPAL_CR_ENTER_LIBRARY();

    /* This stuff is very confusing.  Be sure to see
       src/attribute/attribute.c for a lengthy comment explaining Open
       MPI attribute behavior. */

    ret = ompi_attr_get_c(win->w_keyhash, win_keyval, 
                          (void**)attribute_val, flag);

    /* MPI-2 Section 6.2.2 says that for MPI_WIN_BASE, base will be a
       pointer to the window in C/C++ and an integer representation of
       the base address in Fortran.  The only rational way to do this
       is to store a pointer to the pointer in C (so that the
       attribute code will do the right thing in Fortran) and
       dereference the C attribute here so that it's right for C as
       well. */
    if (win_keyval == MPI_WIN_BASE) {
        *((void**) attribute_val) = *((void**) attribute_val);
    }

    OMPI_ERRHANDLER_RETURN(ret, win, MPI_ERR_OTHER, FUNC_NAME);  
}