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

DEFINITIONS

1. MPI_File_read_at

   1 /* -*- Mode: C; c-basic-offset:4 ; indent-tabs-mode:nil ; -*- */
   2 /* 
   3  *   Copyright (C) 1997 University of Chicago. 
   4  *   See COPYRIGHT notice in top-level directory.
   5  */
   6 
   7 #include "mpioimpl.h"
   8 
   9 #ifdef HAVE_WEAK_SYMBOLS
  10 
  11 #if defined(HAVE_PRAGMA_WEAK)
  12 #pragma weak MPI_File_read_at = PMPI_File_read_at
  13 #elif defined(HAVE_PRAGMA_HP_SEC_DEF)
  14 #pragma _HP_SECONDARY_DEF PMPI_File_read_at MPI_File_read_at
  15 #elif defined(HAVE_PRAGMA_CRI_DUP)
  16 #pragma _CRI duplicate MPI_File_read_at as PMPI_File_read_at
  17 /* end of weak pragmas */
  18 #elif defined(HAVE_WEAK_ATTRIBUTE)
  19 int MPI_File_read_at(MPI_File fh, MPI_Offset offset, void *buf, int count, MPI_Datatype datatype,
  20                      MPI_Status *status) __attribute__((weak,alias("PMPI_File_read_at")));
  21 #endif
  22 
  23 /* Include mapping from MPI->PMPI */
  24 #define MPIO_BUILD_PROFILING
  25 #include "mpioprof.h"
  26 #endif
  27 
  28 /* status object not filled currently */
  29 
  30 /*@
  31     MPI_File_read_at - Read using explicit offset
  32 
  33 Input Parameters:
  34 . fh - file handle (handle)
  35 . offset - file offset (nonnegative integer)
  36 . count - number of elements in buffer (nonnegative integer)
  37 . datatype - datatype of each buffer element (handle)
  38 
  39 Output Parameters:
  40 . buf - initial address of buffer (choice)
  41 . status - status object (Status)
  42 
  43 .N fortran
  44 @*/
  45 int MPI_File_read_at(MPI_File fh, MPI_Offset offset, void *buf,
  46                      int count, MPI_Datatype datatype, MPI_Status *status)
  47 {
  48     int error_code;
  49     static char myname[] = "MPI_FILE_READ_AT";
  50 #ifdef MPI_hpux
  51     int fl_xmpi;
  52 
  53     HPMP_IO_START(fl_xmpi, BLKMPIFILEREADAT, TRDTBLOCK, fh, datatype,
  54                   count);
  55 #endif /* MPI_hpux */
  56 
  57     /* ADIOI_File_read() defined in mpi-io/read.c */
  58     error_code = MPIOI_File_read(fh, offset, ADIO_EXPLICIT_OFFSET, buf,
  59                                  count, datatype, myname, status);
  60 
  61 #ifdef MPI_hpux
  62     HPMP_IO_END(fl_xmpi, fh, datatype, count);
  63 #endif /* MPI_hpux */
  64 
  65     return error_code;
  66 }