root/ompi/mca/io/romio321/romio/mpi-io/get_view.c

DEFINITIONS

1. MPI_File_get_view

   1 /* -*- Mode: C; c-basic-offset:4 ; indent-tabs-mode:nil ; -*- */
   2 /* 
   3  *
   4  *   Copyright (C) 1997 University of Chicago. 
   5  *   See COPYRIGHT notice in top-level directory.
   6  */
   7 
   8 #include "mpioimpl.h"
   9 
  10 #ifdef HAVE_WEAK_SYMBOLS
  11 
  12 #if defined(HAVE_PRAGMA_WEAK)
  13 #pragma weak MPI_File_get_view = PMPI_File_get_view
  14 #elif defined(HAVE_PRAGMA_HP_SEC_DEF)
  15 #pragma _HP_SECONDARY_DEF PMPI_File_get_view MPI_File_get_view
  16 #elif defined(HAVE_PRAGMA_CRI_DUP)
  17 #pragma _CRI duplicate MPI_File_get_view as PMPI_File_get_view
  18 /* end of weak pragmas */
  19 #elif defined(HAVE_WEAK_ATTRIBUTE)
  20 int MPI_File_get_view(MPI_File fh, MPI_Offset *disp, MPI_Datatype *etype, MPI_Datatype *filetype,
  21                       char *datarep) __attribute__((weak,alias("PMPI_File_get_view")));
  22 #endif
  23 
  24 /* Include mapping from MPI->PMPI */
  25 #define MPIO_BUILD_PROFILING
  26 #include "mpioprof.h"
  27 #endif
  28 #ifdef MPISGI
  29 #include "mpisgi2.h"
  30 #endif
  31 
  32 /*@
  33     MPI_File_get_view - Returns the file view
  34 
  35 Input Parameters:
  36 . fh - file handle (handle)
  37 
  38 Output Parameters:
  39 . disp - displacement (nonnegative integer)
  40 . etype - elementary datatype (handle)
  41 . filetype - filetype (handle)
  42 . datarep - data representation (string)
  43 
  44 .N fortran
  45 @*/
  46 int MPI_File_get_view(MPI_File fh, MPI_Offset *disp, MPI_Datatype *etype,
  47                       MPI_Datatype *filetype, char *datarep)
  48 {
  49     int error_code;
  50     ADIO_File adio_fh;
  51     static char myname[] = "MPI_FILE_GET_VIEW";
  52     int i, j, k, combiner;
  53     MPI_Datatype copy_etype, copy_filetype;
  54 
  55     ROMIO_THREAD_CS_ENTER();
  56 
  57     adio_fh = MPIO_File_resolve(fh);
  58 
  59     /* --BEGIN ERROR HANDLING-- */
  60     MPIO_CHECK_FILE_HANDLE(adio_fh, myname, error_code);
  61 
  62     if (datarep == NULL)
  63     {
  64         error_code = MPIO_Err_create_code(MPI_SUCCESS, MPIR_ERR_RECOVERABLE,
  65                                           myname, __LINE__, MPI_ERR_ARG, 
  66                                           "**iodatarepnomem", 0);
  67         error_code = MPIO_Err_return_file(adio_fh, error_code);
  68         goto fn_exit;
  69     }
  70     /* --END ERROR HANDLING-- */
  71 
  72     *disp = adio_fh->disp;
  73     ADIOI_Strncpy(datarep, 
  74             (adio_fh->is_external32 ? "external32": "native"), MPI_MAX_DATAREP_STRING);
  75 
  76     MPI_Type_get_envelope(adio_fh->etype, &i, &j, &k, &combiner);
  77     if (combiner == MPI_COMBINER_NAMED) *etype = adio_fh->etype;
  78     else {
  79         /* FIXME: It is wrong to use MPI_Type_contiguous; the user could choose to
  80            re-implement MPI_Type_contiguous in an unexpected way.  Either use 
  81            MPIR_Barrier_impl as in MPICH or PMPI_Type_contiguous */
  82         MPI_Type_contiguous(1, adio_fh->etype, &copy_etype);
  83 
  84         /* FIXME: Ditto for MPI_Type_commit - use NMPI or PMPI */
  85         MPI_Type_commit(&copy_etype);
  86         *etype = copy_etype;
  87     }
  88     /* FIXME: Ditto for MPI_Type_xxx - use NMPI or PMPI */
  89     MPI_Type_get_envelope(adio_fh->filetype, &i, &j, &k, &combiner);
  90     if (combiner == MPI_COMBINER_NAMED) *filetype = adio_fh->filetype;
  91     else {
  92         MPI_Type_contiguous(1, adio_fh->filetype, &copy_filetype);
  93 
  94         MPI_Type_commit(&copy_filetype);
  95         *filetype = copy_filetype;
  96     }
  97 
  98 fn_exit:
  99     ROMIO_THREAD_CS_EXIT();
 100 
 101     return MPI_SUCCESS;
 102 }