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

DEFINITIONS

1. MPI_File_set_size

   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_set_size = PMPI_File_set_size
  14 #elif defined(HAVE_PRAGMA_HP_SEC_DEF)
  15 #pragma _HP_SECONDARY_DEF PMPI_File_set_size MPI_File_set_size
  16 #elif defined(HAVE_PRAGMA_CRI_DUP)
  17 #pragma _CRI duplicate MPI_File_set_size as PMPI_File_set_size
  18 /* end of weak pragmas */
  19 #elif defined(HAVE_WEAK_ATTRIBUTE)
  20 int MPI_File_set_size(MPI_File fh, MPI_Offset size) __attribute__((weak,alias("PMPI_File_set_size")));
  21 #endif
  22 
  23 /* Include mapping from MPI->PMPI */
  24 #define MPIO_BUILD_PROFILING
  25 #include "mpioprof.h"
  26 #endif
  27 
  28 /*@
  29     MPI_File_set_size - Sets the file size
  30 
  31 Input Parameters:
  32 . fh - file handle (handle)
  33 . size - size to truncate or expand file (nonnegative integer)
  34 
  35 .N fortran
  36 @*/
  37 int MPI_File_set_size(MPI_File fh, MPI_Offset size)
  38 {
  39     int error_code;
  40     ADIO_File adio_fh;
  41     static char myname[] = "MPI_FILE_SET_SIZE";
  42     MPI_Offset tmp_sz, max_sz, min_sz;
  43 
  44 #ifdef MPI_hpux
  45     int fl_xmpi;
  46 
  47     HPMP_IO_START(fl_xmpi, BLKMPIFILESETSIZE, TRDTBLOCK, adio_fh,
  48                   MPI_DATATYPE_NULL, -1);
  49 #endif /* MPI_hpux */
  50 
  51     ROMIO_THREAD_CS_ENTER();
  52 
  53     adio_fh = MPIO_File_resolve(fh);
  54 
  55     /* --BEGIN ERROR HANDLING-- */
  56     MPIO_CHECK_FILE_HANDLE(adio_fh, myname, error_code);
  57     MPIO_CHECK_NOT_SEQUENTIAL_MODE(adio_fh, myname, error_code);
  58 
  59     if (size < 0) {
  60         error_code = MPIO_Err_create_code(MPI_SUCCESS, MPIR_ERR_RECOVERABLE,
  61                                           myname, __LINE__, MPI_ERR_ARG,
  62                                           "**iobadsize", 0);
  63         error_code = MPIO_Err_return_file(adio_fh, error_code);
  64         goto fn_exit;
  65     }
  66     MPIO_CHECK_WRITABLE(fh, myname, error_code);
  67     /* --END ERROR HANDLING-- */
  68 
  69     tmp_sz = size;
  70     MPI_Allreduce(&tmp_sz, &max_sz, 1, ADIO_OFFSET, MPI_MAX, adio_fh->comm);
  71     MPI_Allreduce(&tmp_sz, &min_sz, 1, ADIO_OFFSET, MPI_MIN, adio_fh->comm);
  72 
  73     /* --BEGIN ERROR HANDLING-- */
  74     if (max_sz != min_sz) {
  75         error_code = MPIO_Err_create_code(MPI_SUCCESS, MPIR_ERR_RECOVERABLE,
  76                                           myname, __LINE__, MPI_ERR_ARG,
  77                                           "**notsame", 0);
  78         error_code = MPIO_Err_return_file(adio_fh, error_code);
  79         goto fn_exit;
  80     }
  81     /* --END ERROR HANDLING-- */
  82 
  83     if (!ADIO_Feature(adio_fh, ADIO_SCALABLE_RESIZE)) {
  84         /* rare stupid file systems (like NFS) need to carry out resize on all
  85          * processes */
  86         ADIOI_TEST_DEFERRED(adio_fh, "MPI_File_set_size", &error_code);
  87     }
  88 
  89     ADIO_Resize(adio_fh, size, &error_code);
  90     /* TODO: what to do with error code? */
  91     
  92     /* --BEGIN ERROR HANDLING-- */
  93     if (error_code != MPI_SUCCESS)
  94         error_code = MPIO_Err_return_file(adio_fh, error_code);
  95     /* --END ERROR HANDLING-- */
  96 
  97 #ifdef MPI_hpux
  98     HPMP_IO_END(fl_xmpi, adio_fh, MPI_DATATYPE_NULL, -1);
  99 #endif /* MPI_hpux */
 100 
 101 fn_exit:
 102     ROMIO_THREAD_CS_EXIT();
 103 
 104     return error_code;
 105 }