ompi/mca/io/romio321/romio/mpi-io/read.c

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This source file includes following definitions.
MPI_File_read
MPIOI_File_read
   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 = PMPI_File_read
  13 #elif defined(HAVE_PRAGMA_HP_SEC_DEF)
  14 #pragma _HP_SECONDARY_DEF PMPI_File_read MPI_File_read
  15 #elif defined(HAVE_PRAGMA_CRI_DUP)
  16 #pragma _CRI duplicate MPI_File_read as PMPI_File_read
  17 /* end of weak pragmas */
  18 #elif defined(HAVE_WEAK_ATTRIBUTE)
  19 int MPI_File_read(MPI_File fh, void *buf, int count, MPI_Datatype datatype, MPI_Status *status)
  20     __attribute__((weak,alias("PMPI_File_read")));
  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 - Read using individual file pointer
  32 
  33 Input Parameters:
  34 . fh - file handle (handle)
  35 . count - number of elements in buffer (nonnegative integer)
  36 . datatype - datatype of each buffer element (handle)
  37 
  38 Output Parameters:
  39 . buf - initial address of buffer (choice)
  40 . status - status object (Status)
  41 
  42 .N fortran
  43 @*/
  44 int MPI_File_read(MPI_File fh, void *buf, int count,
  45                   MPI_Datatype datatype, MPI_Status *status)
  46 {
  47     int error_code;
  48     static char myname[] = "MPI_FILE_READ";
  49 #ifdef MPI_hpux
  50     int fl_xmpi;
  51 
  52     HPMP_IO_START(fl_xmpi, BLKMPIFILEREAD, TRDTBLOCK, fh, datatype, count);
  53 #endif /* MPI_hpux */
  54 
  55     error_code = MPIOI_File_read(fh, (MPI_Offset) 0, ADIO_INDIVIDUAL, buf,
  56                                  count, datatype, myname, status);
  57 
  58 #ifdef MPI_hpux
  59     HPMP_IO_END(fl_xmpi, fh, datatype, count);
  60 #endif /* MPI_hpux */
  61 
  62     return error_code;
  63 }
  64 
  65 /* prevent multiple definitions of this routine */
  66 #ifdef MPIO_BUILD_PROFILING
  67 int MPIOI_File_read(MPI_File fh,
  68                     MPI_Offset offset,
  69                     int file_ptr_type,
  70                     void *buf,
  71                     int count,
  72                     MPI_Datatype datatype,
  73                     char *myname,
  74                     MPI_Status *status)
  75 {
  76     int error_code, buftype_is_contig, filetype_is_contig;
  77     MPI_Count datatype_size;
  78     ADIO_File adio_fh;
  79     ADIO_Offset off, bufsize;
  80     void *xbuf=NULL, *e32_buf=NULL;
  81 
  82     ROMIO_THREAD_CS_ENTER();
  83 
  84     adio_fh = MPIO_File_resolve(fh);
  85 
  86     /* --BEGIN ERROR HANDLING-- */
  87     MPIO_CHECK_FILE_HANDLE(adio_fh, myname, error_code);
  88     MPIO_CHECK_COUNT(adio_fh, count, myname, error_code);
  89     MPIO_CHECK_DATATYPE(adio_fh, datatype, myname, error_code);
  90 
  91     if (file_ptr_type == ADIO_EXPLICIT_OFFSET && offset < 0)
  92     {
  93         error_code = MPIO_Err_create_code(MPI_SUCCESS, MPIR_ERR_RECOVERABLE,
  94                                           myname, __LINE__, MPI_ERR_ARG,
  95                                           "**iobadoffset", 0);
  96         error_code = MPIO_Err_return_file(adio_fh, error_code);
  97         goto fn_exit;
  98     }
  99     /* --END ERROR HANDLING-- */
 100 
 101     MPI_Type_size_x(datatype, &datatype_size);
 102 
 103     /* --BEGIN ERROR HANDLING-- */
 104     MPIO_CHECK_COUNT_SIZE(adio_fh, count, datatype_size, myname, error_code);
 105     /* --END ERROR HANDLING-- */
 106 
 107     if (count*datatype_size == 0)
 108     {
 109 #ifdef HAVE_STATUS_SET_BYTES
 110        MPIR_Status_set_bytes(status, datatype, 0);
 111 #endif
 112         error_code = MPI_SUCCESS;
 113         goto fn_exit;
 114     }
 115 
 116     /* --BEGIN ERROR HANDLING-- */
 117     MPIO_CHECK_INTEGRAL_ETYPE(adio_fh, count, datatype_size, myname, error_code);
 118     MPIO_CHECK_READABLE(adio_fh, myname, error_code);
 119     MPIO_CHECK_NOT_SEQUENTIAL_MODE(adio_fh, myname, error_code);
 120     /* --END ERROR HANDLING-- */
 121 
 122     ADIOI_Datatype_iscontig(datatype, &buftype_is_contig);
 123     ADIOI_Datatype_iscontig(adio_fh->filetype, &filetype_is_contig);
 124 
 125     ADIOI_TEST_DEFERRED(adio_fh, myname, &error_code);
 126 
 127     xbuf = buf;
 128     if (adio_fh->is_external32)
 129     {
 130         MPI_Aint e32_size = 0;
 131         error_code = MPIU_datatype_full_size(datatype, &e32_size);
 132         if (error_code != MPI_SUCCESS)
 133             goto fn_exit;
 134 
 135         e32_buf = ADIOI_Malloc(e32_size*count);
 136         xbuf = e32_buf;
 137     }
 138 
 139     if (buftype_is_contig && filetype_is_contig)
 140     {
 141     /* convert count and offset to bytes */
 142         bufsize = datatype_size * count;
 143         if (file_ptr_type == ADIO_EXPLICIT_OFFSET) {
 144             off = adio_fh->disp + adio_fh->etype_size * offset;
 145         }
 146         else /* ADIO_INDIVIDUAL */ {
 147             off = adio_fh->fp_ind;
 148         }
 149 
 150         /* if atomic mode requested, lock (exclusive) the region, because
 151            there could be a concurrent noncontiguous request.
 152          */
 153         if ((adio_fh->atomicity) && ADIO_Feature(adio_fh, ADIO_LOCKS)) {
 154             ADIOI_WRITE_LOCK(adio_fh, off, SEEK_SET, bufsize);
 155         }
 156 
 157         ADIO_ReadContig(adio_fh, xbuf, count, datatype, file_ptr_type,
 158                         off, status, &error_code); 
 159 
 160         if ((adio_fh->atomicity) && ADIO_Feature(adio_fh, ADIO_LOCKS)) {
 161             ADIOI_UNLOCK(adio_fh, off, SEEK_SET, bufsize);
 162         }
 163     }
 164     else
 165     {
 166         ADIO_ReadStrided(adio_fh, xbuf, count, datatype, file_ptr_type,
 167                           offset, status, &error_code);
 168         /* For strided and atomic mode, locking is done in ADIO_ReadStrided */
 169     }
 170 
 171     /* --BEGIN ERROR HANDLING-- */
 172     if (error_code != MPI_SUCCESS)
 173         error_code = MPIO_Err_return_file(adio_fh, error_code);
 174     /* --END ERROR HANDLING-- */
 175 
 176     if (e32_buf != NULL) {
 177         error_code = MPIU_read_external32_conversion_fn(buf, datatype,
 178                 count, e32_buf);
 179         ADIOI_Free(e32_buf);
 180     }
 181 
 182 fn_exit:
 183     ROMIO_THREAD_CS_EXIT();
 184 
 185     return error_code;
 186 }
 187 #endif
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root/ompi/mca/io/romio321/romio/mpi-io/read.c

DEFINITIONS
