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

DEFINITIONS

1. MPI_File_write_ordered

   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 
   9 #include "mpioimpl.h"
  10 
  11 #ifdef HAVE_WEAK_SYMBOLS
  12 
  13 #if defined(HAVE_PRAGMA_WEAK)
  14 #pragma weak MPI_File_write_ordered = PMPI_File_write_ordered
  15 #elif defined(HAVE_PRAGMA_HP_SEC_DEF)
  16 #pragma _HP_SECONDARY_DEF PMPI_File_write_ordered MPI_File_write_ordered
  17 #elif defined(HAVE_PRAGMA_CRI_DUP)
  18 #pragma _CRI duplicate MPI_File_write_ordered as PMPI_File_write_ordered
  19 /* end of weak pragmas */
  20 #elif defined(HAVE_WEAK_ATTRIBUTE)
  21 int MPI_File_write_ordered(MPI_File fh, const void *buf, int count, MPI_Datatype datatype,
  22                            MPI_Status *status) __attribute__((weak,alias("PMPI_File_write_ordered")));
  23 #endif
  24 
  25 /* Include mapping from MPI->PMPI */
  26 #define MPIO_BUILD_PROFILING
  27 #include "mpioprof.h"
  28 #endif
  29 
  30 /* status object not filled currently */
  31 
  32 /*@
  33     MPI_File_write_ordered - Collective write using shared file pointer
  34 
  35 Input Parameters:
  36 . fh - file handle (handle)
  37 . buf - initial address of buffer (choice)
  38 . count - number of elements in buffer (nonnegative integer)
  39 . datatype - datatype of each buffer element (handle)
  40 
  41 Output Parameters:
  42 . status - status object (Status)
  43 
  44 .N fortran
  45 @*/
  46 int MPI_File_write_ordered(MPI_File fh, ROMIO_CONST void *buf, int count,
  47                            MPI_Datatype datatype, MPI_Status *status)
  48 {
  49     int error_code, nprocs, myrank;
  50     ADIO_Offset incr;
  51     MPI_Count datatype_size;
  52     int source, dest;
  53     static char myname[] = "MPI_FILE_WRITE_ORDERED";
  54     ADIO_Offset shared_fp;
  55     ADIO_File adio_fh;
  56     void *e32buf=NULL;
  57     const void *xbuf;
  58 
  59     ROMIO_THREAD_CS_ENTER();
  60 
  61     adio_fh = MPIO_File_resolve(fh);
  62 
  63     /* --BEGIN ERROR HANDLING-- */
  64     MPIO_CHECK_FILE_HANDLE(adio_fh, myname, error_code);
  65     MPIO_CHECK_COUNT(adio_fh, count, myname, error_code);
  66     MPIO_CHECK_DATATYPE(adio_fh, datatype, myname, error_code);
  67     /* --END ERROR HANDLING-- */
  68 
  69     MPI_Type_size_x(datatype, &datatype_size);
  70 
  71     /* --BEGIN ERROR HANDLING-- */
  72     MPIO_CHECK_INTEGRAL_ETYPE(adio_fh, count, datatype_size, myname, error_code);
  73     MPIO_CHECK_FS_SUPPORTS_SHARED(adio_fh, myname, error_code);
  74     MPIO_CHECK_COUNT_SIZE(adio_fh, count, datatype_size, myname, error_code);
  75     /* --END ERROR HANDLING-- */
  76 
  77     ADIOI_TEST_DEFERRED(adio_fh, myname, &error_code);
  78 
  79     MPI_Comm_size(adio_fh->comm, &nprocs);
  80     MPI_Comm_rank(adio_fh->comm, &myrank);
  81 
  82     incr = (count*datatype_size)/adio_fh->etype_size;
  83     /* Use a message as a 'token' to order the operations */
  84     source = myrank - 1;
  85     dest   = myrank + 1;
  86     if (source < 0) source = MPI_PROC_NULL;
  87     if (dest >= nprocs) dest = MPI_PROC_NULL;
  88     MPI_Recv(NULL, 0, MPI_BYTE, source, 0, adio_fh->comm, MPI_STATUS_IGNORE);
  89 
  90     ADIO_Get_shared_fp(adio_fh, incr, &shared_fp, &error_code);
  91 
  92     /* --BEGIN ERROR HANDLING-- */
  93     if (error_code != MPI_SUCCESS) {
  94         error_code = MPIO_Err_create_code(MPI_SUCCESS, MPIR_ERR_FATAL,
  95                                           myname, __LINE__, MPI_ERR_INTERN, 
  96                                           "**iosharedfailed", 0);
  97         error_code = MPIO_Err_return_file(adio_fh, error_code);
  98         goto fn_exit;
  99     }
 100     /* --END ERROR HANDLING-- */
 101 
 102     MPI_Send(NULL, 0, MPI_BYTE, dest, 0, adio_fh->comm);
 103 
 104     xbuf = buf;
 105     if (adio_fh->is_external32) {
 106         error_code = MPIU_external32_buffer_setup(buf, count, datatype, &e32buf);
 107         if (error_code != MPI_SUCCESS) 
 108             goto fn_exit;
 109 
 110         xbuf = e32buf;
 111     }
 112 
 113     ADIO_WriteStridedColl(adio_fh, xbuf, count, datatype, ADIO_EXPLICIT_OFFSET,
 114                           shared_fp, status, &error_code);
 115 
 116     /* --BEGIN ERROR HANDLING-- */
 117     if (error_code != MPI_SUCCESS)
 118         error_code = MPIO_Err_return_file(adio_fh, error_code);
 119     /* --END ERROR HANDLING-- */
 120 
 121 fn_exit:
 122     if (e32buf != NULL) ADIOI_Free(e32buf);
 123     ROMIO_THREAD_CS_EXIT();
 124 
 125     /* FIXME: Check for error code from WriteStridedColl? */
 126     return error_code;
 127 }
 128