request_c2f.c

MPI stands for the Message Passing Interface. Written by the MPI Forum (a large committee comprising

/*
 * Copyright (c) 2004-2005 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/mpi/f77/fint_2_int.h"
#include "ompi/request/request.h"

#if OMPI_HAVE_WEAK_SYMBOLS && OMPI_PROFILING_DEFINES
#pragma weak MPI_Request_c2f = PMPI_Request_c2f
#endif

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

static const char FUNC_NAME[] = "MPI_Request_f2c";


MPI_Fint MPI_Request_c2f(MPI_Request request) 
{
    if ( MPI_PARAM_CHECK ) {
        OMPI_ERR_INIT_FINALIZE(FUNC_NAME);

        if (NULL == request) {
            return OMPI_INT_2_FINT(-1);
        }
    }

    /* We only put requests in the f2c table when this function is
       invoked.  This is because putting requests in the table
       involves locking and unlocking the table, which would incur a
       performance penalty (in the critical performance path) for C
       applications.  In this way, at least only Fortran applications
       are penalized.  :-\

       Modifying this one function neatly fixes up all the Fortran
       bindings because they all call MPI_Request_c2f in order to
       transmorgify the C MPI_Request that they got back into a
       fortran integer.
    */

    if (MPI_UNDEFINED == request->req_f_to_c_index) {
        request->req_f_to_c_index = 
            ompi_pointer_array_add(&ompi_request_f_to_c_table, request);
    }

    return OMPI_INT_2_FINT(request->req_f_to_c_index) ;
}