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

DEFINITIONS

1. MPI_File_write_ordered_begin

   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_write_ordered_begin = PMPI_File_write_ordered_begin
  14 #elif defined(HAVE_PRAGMA_HP_SEC_DEF)
  15 #pragma _HP_SECONDARY_DEF PMPI_File_write_ordered_begin MPI_File_write_ordered_begin
  16 #elif defined(HAVE_PRAGMA_CRI_DUP)
  17 #pragma _CRI duplicate MPI_File_write_ordered_begin as PMPI_File_write_ordered_begin
  18 /* end of weak pragmas */
  19 #elif defined(HAVE_WEAK_ATTRIBUTE)
  20 int MPI_File_write_ordered_begin(MPI_File fh, const void *buf, int count, MPI_Datatype datatype)
  21     __attribute__((weak,alias("PMPI_File_write_ordered_begin")));
  22 #endif
  23 
  24 /* Include mapping from MPI->PMPI */
  25 #define MPIO_BUILD_PROFILING
  26 #include "mpioprof.h"
  27 #endif
  28 
  29 /*@
  30     MPI_File_write_ordered_begin - Begin a split collective write using shared file pointer
  31 
  32 Input Parameters:
  33 . fh - file handle (handle)
  34 . count - number of elements in buffer (nonnegative integer)
  35 . datatype - datatype of each buffer element (handle)
  36 
  37 Output Parameters:
  38 . buf - initial address of buffer (choice)
  39 
  40 .N fortran
  41 @*/
  42 int MPI_File_write_ordered_begin(MPI_File fh, ROMIO_CONST void *buf, int count,
  43                                  MPI_Datatype datatype)
  44 {
  45     int error_code, nprocs, myrank;
  46     ADIO_Offset incr;
  47     MPI_Count datatype_size;
  48     int source, dest;
  49     static char myname[] = "MPI_FILE_WRITE_ORDERED_BEGIN";
  50     ADIO_Offset shared_fp;
  51     ADIO_File adio_fh;
  52     void *e32buf = NULL;
  53     const void *xbuf=NULL;
  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     MPIO_CHECK_COUNT(adio_fh, count, myname, error_code);
  62     MPIO_CHECK_DATATYPE(adio_fh, datatype, myname, error_code);
  63 
  64     if (adio_fh->split_coll_count)
  65     {
  66         error_code = MPIO_Err_create_code(MPI_SUCCESS, MPIR_ERR_RECOVERABLE,
  67                                           myname, __LINE__, MPI_ERR_IO, 
  68                                           "**iosplitcoll", 0);
  69         error_code = MPIO_Err_return_file(adio_fh, error_code);
  70         goto fn_exit;
  71     }
  72     /* --END ERROR HANDLING-- */
  73 
  74     adio_fh->split_coll_count = 1;
  75 
  76     MPI_Type_size_x(datatype, &datatype_size);
  77     /* --BEGIN ERROR HANDLING-- */
  78     MPIO_CHECK_INTEGRAL_ETYPE(adio_fh, count, datatype_size, myname, error_code);
  79     MPIO_CHECK_FS_SUPPORTS_SHARED(adio_fh, myname, error_code);
  80     MPIO_CHECK_COUNT_SIZE(adio_fh, count, datatype_size, myname, error_code);
  81     /* --END ERROR HANDLING-- */
  82 
  83     ADIOI_TEST_DEFERRED(adio_fh, myname, &error_code);
  84 
  85     MPI_Comm_size(adio_fh->comm, &nprocs);
  86     MPI_Comm_rank(adio_fh->comm, &myrank);
  87 
  88     incr = (count*datatype_size)/adio_fh->etype_size;
  89     /* Use a message as a 'token' to order the operations */
  90     source = myrank - 1;
  91     dest   = myrank + 1;
  92     if (source < 0) source = MPI_PROC_NULL;
  93     if (dest >= nprocs) dest = MPI_PROC_NULL;
  94     MPI_Recv(NULL, 0, MPI_BYTE, source, 0, adio_fh->comm, MPI_STATUS_IGNORE);
  95 
  96     ADIO_Get_shared_fp(adio_fh, incr, &shared_fp, &error_code);
  97     /* --BEGIN ERROR HANDLING-- */
  98     if (error_code != MPI_SUCCESS)
  99     {
 100         error_code = MPIO_Err_create_code(MPI_SUCCESS, MPIR_ERR_FATAL,
 101                                           myname, __LINE__, MPI_ERR_INTERN, 
 102                                           "**iosharedfailed", 0);
 103         error_code = MPIO_Err_return_file(adio_fh, error_code);
 104         goto fn_exit;
 105     }
 106     /* --END ERROR HANDLING-- */
 107 
 108     MPI_Send(NULL, 0, MPI_BYTE, dest, 0, adio_fh->comm);
 109 
 110     xbuf = buf;
 111     if (adio_fh->is_external32) {
 112         error_code = MPIU_external32_buffer_setup(buf, count, datatype, &e32buf);
 113         if (error_code != MPI_SUCCESS) 
 114             goto fn_exit;
 115 
 116         xbuf = e32buf;
 117     }
 118 
 119     ADIO_WriteStridedColl(adio_fh, xbuf, count, datatype, ADIO_EXPLICIT_OFFSET,
 120                           shared_fp, &adio_fh->split_status, &error_code);
 121 
 122     /* --BEGIN ERROR HANDLING-- */
 123     if (error_code != MPI_SUCCESS)
 124         error_code = MPIO_Err_return_file(adio_fh, error_code);
 125     /* --END ERROR HANDLING-- */
 126 
 127 fn_exit:
 128     ROMIO_THREAD_CS_EXIT();
 129 
 130     /* FIXME: Check for error code from WriteStridedColl? */
 131     return error_code;
 132 }