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

DEFINITIONS

1. MPI_File_iread
2. MPIOI_File_iread

   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_iread = PMPI_File_iread
  14 #elif defined(HAVE_PRAGMA_HP_SEC_DEF)
  15 #pragma _HP_SECONDARY_DEF PMPI_File_iread MPI_File_iread
  16 #elif defined(HAVE_PRAGMA_CRI_DUP)
  17 #pragma _CRI duplicate MPI_File_iread as PMPI_File_iread
  18 /* end of weak pragmas */
  19 #elif defined(HAVE_WEAK_ATTRIBUTE)
  20 int MPI_File_iread(MPI_File fh, void *buf, int count, MPI_Datatype datatype, MPIO_Request *request)
  21     __attribute__((weak,alias("PMPI_File_iread")));
  22 #endif
  23 
  24 /* Include mapping from MPI->PMPI */
  25 #define MPIO_BUILD_PROFILING
  26 #include "mpioprof.h"
  27 #endif
  28 
  29 #ifdef HAVE_MPI_GREQUEST
  30 #include "mpiu_greq.h"
  31 #endif
  32 
  33 /*@
  34     MPI_File_iread - Nonblocking read using individual file pointer
  35 
  36 Input Parameters:
  37 . fh - file handle (handle)
  38 . count - number of elements in buffer (nonnegative integer)
  39 . datatype - datatype of each buffer element (handle)
  40 
  41 Output Parameters:
  42 . buf - initial address of buffer (choice)
  43 . request - request object (handle)
  44 
  45 .N fortran
  46 @*/
  47 int MPI_File_iread(MPI_File fh, void *buf, int count, MPI_Datatype datatype, MPI_Request *request)
  48 {
  49     int error_code=MPI_SUCCESS;
  50     static char myname[] = "MPI_FILE_IREAD";
  51 #ifdef MPI_hpux
  52     int fl_xmpi;
  53 
  54     HPMP_IO_START(fl_xmpi, BLKMPIFILEIREAD, TRDTSYSTEM, fh, datatype,
  55                   count);
  56 #endif /* MPI_hpux */
  57 
  58 
  59     error_code = MPIOI_File_iread(fh, (MPI_Offset) 0, ADIO_INDIVIDUAL,
  60                                   buf, count, datatype, myname, request);
  61     
  62     /* --BEGIN ERROR HANDLING-- */
  63     if (error_code != MPI_SUCCESS)
  64         error_code = MPIO_Err_return_file(fh, error_code);
  65     /* --END ERROR HANDLING-- */
  66 
  67 #ifdef MPI_hpux
  68     HPMP_IO_END(fl_xmpi, fh, datatype, count);
  69 #endif /* MPI_hpux */
  70 
  71     return error_code;
  72 }
  73 
  74 /* prevent multiple definitions of this routine */
  75 #ifdef MPIO_BUILD_PROFILING
  76 int MPIOI_File_iread(MPI_File fh, MPI_Offset offset, int file_ptr_type, void *buf, int count,
  77                      MPI_Datatype datatype, char *myname, MPI_Request *request)
  78 {
  79     int error_code, buftype_is_contig, filetype_is_contig;
  80     MPI_Count datatype_size;
  81     ADIO_Status status;
  82     ADIO_File adio_fh;
  83     ADIO_Offset off, bufsize;
  84     MPI_Offset nbytes=0;
  85 
  86     ROMIO_THREAD_CS_ENTER();
  87 
  88     adio_fh = MPIO_File_resolve(fh);
  89 
  90     /* --BEGIN ERROR HANDLING-- */
  91     MPIO_CHECK_FILE_HANDLE(adio_fh, myname, error_code);
  92     MPIO_CHECK_COUNT(adio_fh, count, myname, error_code);
  93     MPIO_CHECK_DATATYPE(adio_fh, datatype, myname, error_code);
  94 
  95     if (file_ptr_type == ADIO_EXPLICIT_OFFSET && offset < 0) {
  96         error_code = MPIO_Err_create_code(MPI_SUCCESS, MPIR_ERR_RECOVERABLE,
  97                                           myname, __LINE__, MPI_ERR_ARG,
  98                                           "**iobadoffset", 0);
  99         error_code = MPIO_Err_return_file(adio_fh, error_code);
 100         goto fn_exit;
 101     }
 102     /* --END ERROR HANDLING-- */
 103 
 104     MPI_Type_size_x(datatype, &datatype_size);
 105 
 106     /* --BEGIN ERROR HANDLING-- */
 107     MPIO_CHECK_INTEGRAL_ETYPE(adio_fh, count, datatype_size, myname, error_code);
 108     MPIO_CHECK_READABLE(adio_fh, myname, error_code);
 109     MPIO_CHECK_NOT_SEQUENTIAL_MODE(adio_fh, myname, error_code);
 110     MPIO_CHECK_COUNT_SIZE(adio_fh, count, datatype_size, myname, error_code);
 111     /* --END ERROR HANDLING-- */
 112 
 113     ADIOI_Datatype_iscontig(datatype, &buftype_is_contig);
 114     ADIOI_Datatype_iscontig(adio_fh->filetype, &filetype_is_contig);
 115 
 116     ADIOI_TEST_DEFERRED(adio_fh, myname, &error_code);
 117 
 118     if (buftype_is_contig && filetype_is_contig) {
 119         /* convert count and offset to bytes */
 120         bufsize = datatype_size * count;
 121 
 122         if (file_ptr_type == ADIO_EXPLICIT_OFFSET) {
 123             off = adio_fh->disp + adio_fh->etype_size * offset;
 124         }
 125         else {
 126             off = adio_fh->fp_ind;
 127         }
 128 
 129         if (!(adio_fh->atomicity))
 130             ADIO_IreadContig(adio_fh, buf, count, datatype, file_ptr_type,
 131                         off, request, &error_code); 
 132         else {
 133             /* to maintain strict atomicity semantics with other concurrent
 134               operations, lock (exclusive) and call blocking routine */
 135             if (ADIO_Feature(adio_fh, ADIO_LOCKS))
 136             {
 137                 ADIOI_WRITE_LOCK(adio_fh, off, SEEK_SET, bufsize);
 138             }
 139 
 140             ADIO_ReadContig(adio_fh, buf, count, datatype, file_ptr_type,
 141                             off, &status, &error_code);
 142 
 143             if (ADIO_Feature(adio_fh, ADIO_LOCKS))
 144             {
 145                 ADIOI_UNLOCK(adio_fh, off, SEEK_SET, bufsize);
 146             }
 147             if (error_code == MPI_SUCCESS) {
 148                 nbytes = count*datatype_size;
 149             }
 150             MPIO_Completed_request_create(&adio_fh, nbytes, &error_code, request);
 151         }
 152     }
 153     else ADIO_IreadStrided(adio_fh, buf, count, datatype, file_ptr_type,
 154                            offset, request, &error_code); 
 155 
 156 fn_exit:
 157     ROMIO_THREAD_CS_EXIT();
 158 
 159     return error_code;
 160 }
 161 #endif