root/ompi/mpi/c/file_read_at.c

DEFINITIONS

1. MPI_File_read_at

   1 /*
   2  * Copyright (c) 2004-2007 The Trustees of Indiana University and Indiana
   3  *                         University Research and Technology
   4  *                         Corporation.  All rights reserved.
   5  * Copyright (c) 2004-2005 The University of Tennessee and The University
   6  *                         of Tennessee Research Foundation.  All rights
   7  *                         reserved.
   8  * Copyright (c) 2004-2008 High Performance Computing Center Stuttgart,
   9  *                         University of Stuttgart.  All rights reserved.
  10  * Copyright (c) 2004-2005 The Regents of the University of California.
  11  *                         All rights reserved.
  12  * Copyright (c) 2008      Sun Microsystems, Inc.  All rights reserved.
  13  * Copyright (c) 2015      Research Organization for Information Science
  14  *                         and Technology (RIST). All rights reserved.
  15  * $COPYRIGHT$
  16  *
  17  * Additional copyrights may follow
  18  *
  19  * $HEADER$
  20  */
  21 
  22 #include "ompi_config.h"
  23 
  24 #include "ompi/mpi/c/bindings.h"
  25 #include "ompi/runtime/params.h"
  26 #include "ompi/errhandler/errhandler.h"
  27 #include "ompi/file/file.h"
  28 #include "ompi/datatype/ompi_datatype.h"
  29 #include "ompi/memchecker.h"
  30 
  31 #if OMPI_BUILD_MPI_PROFILING
  32 #if OPAL_HAVE_WEAK_SYMBOLS
  33 #pragma weak MPI_File_read_at = PMPI_File_read_at
  34 #endif
  35 #define MPI_File_read_at PMPI_File_read_at
  36 #endif
  37 
  38 static const char FUNC_NAME[] = "MPI_File_read_at";
  39 
  40 
  41 int MPI_File_read_at(MPI_File fh, MPI_Offset offset, void *buf,
  42                      int count, MPI_Datatype datatype, MPI_Status *status)
  43 {
  44     int rc;
  45 
  46     MEMCHECKER(
  47         memchecker_datatype(datatype);
  48     );
  49 
  50     if (MPI_PARAM_CHECK) {
  51         rc = MPI_SUCCESS;
  52         OMPI_ERR_INIT_FINALIZE(FUNC_NAME);
  53         if (ompi_file_invalid(fh)) {
  54             fh = MPI_FILE_NULL;
  55             rc = MPI_ERR_FILE;
  56         } else if (count < 0) {
  57             rc = MPI_ERR_COUNT;
  58         } else {
  59            OMPI_CHECK_DATATYPE_FOR_RECV(rc, datatype, count);
  60         }
  61         OMPI_ERRHANDLER_CHECK(rc, fh, rc, FUNC_NAME);
  62     }
  63 
  64     OPAL_CR_ENTER_LIBRARY();
  65 
  66     /* Call the back-end io component function */
  67 
  68     switch (fh->f_io_version) {
  69     case MCA_IO_BASE_V_2_0_0:
  70         rc = fh->f_io_selected_module.v2_0_0.
  71             io_module_file_read_at(fh, offset, buf, count, datatype, status);
  72         break;
  73 
  74     default:
  75         rc = MPI_ERR_INTERN;
  76         break;
  77     }
  78 
  79     /* All done */
  80 
  81     OMPI_ERRHANDLER_RETURN(rc, fh, rc, FUNC_NAME);
  82 }