gcc/ada/s-osinte-rtems.adb

   1 ------------------------------------------------------------------------------
   2 --                                                                          --
   3 --                GNU ADA RUN-TIME LIBRARY (GNARL) COMPONENTS               --
   4 --                                                                          --
   5 --                   S Y S T E M . O S _ I N T E R F A C E                  --
   6 --                                                                          --
   7 --                                  B o d y                                 --
   8 --                                                                          --
   9 --            Copyright (C) 1991-2002 Florida State University              --
  10 --                                                                          --
  11 -- GNARL is free software; you can  redistribute it  and/or modify it under --
  12 -- terms of the  GNU General Public License as published  by the Free Soft- --
  13 -- ware  Foundation;  either version 2,  or (at your option) any later ver- --
  14 -- sion. GNARL is distributed in the hope that it will be useful, but WITH- --
  15 -- OUT ANY WARRANTY;  without even the  implied warranty of MERCHANTABILITY --
  16 -- or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License --
  17 -- for  more details.  You should have  received  a copy of the GNU General --
  18 -- Public License  distributed with GNARL; see file COPYING.  If not, write --
  19 -- to  the  Free Software Foundation,  51  Franklin  Street,  Fifth  Floor, --
  20 -- Boston, MA 02110-1301, USA.                                              --
  21 --                                                                          --
  22 -- As a special exception,  if other files  instantiate  generics from this --
  23 -- unit, or you link  this unit with other files  to produce an executable, --
  24 -- this  unit  does not  by itself cause  the resulting  executable  to  be --
  25 -- covered  by the  GNU  General  Public  License.  This exception does not --
  26 -- however invalidate  any other reasons why  the executable file  might be --
  27 -- covered by the  GNU Public License.                                      --
  28 --                                                                          --
  29 -- GNARL was developed by the GNARL team at Florida State University. It is --
  30 -- now maintained by Ada Core Technologies Inc. in cooperation with Florida --
  31 -- State University (http://www.gnat.com).                                  --
  32 --                                                                          --
  33 -- The GNARL files that were developed for RTEMS are maintained by  On-Line --
  34 -- Applications Research Corporation (http://www.oarcorp.com)  in  coopera- --
  35 -- tion with Ada Core Technologies Inc. and Florida State University.       --
  36 --                                                                          --
  37 ------------------------------------------------------------------------------
  38
  39 --  This is the RTEMS version of this package
  40
  41 --  This package encapsulates all direct interfaces to OS services
  42 --  that are needed by children of System.
  43
  44 pragma Polling (Off);
  45 --  Turn off polling, we do not want ATC polling to take place during
  46 --  tasking operations. It causes infinite loops and other problems.
  47
  48 with Interfaces.C; use Interfaces.C;
  49 package body System.OS_Interface is
  50
  51    -----------------
  52    -- To_Duration --
  53    -----------------
  54
  55    function To_Duration (TS : timespec) return Duration is
  56    begin
  57       return Duration (TS.tv_sec) + Duration (TS.tv_nsec) / 10#1#E9;
  58    end To_Duration;
  59
  60    -----------------
  61    -- To_Timespec --
  62    -----------------
  63
  64    function To_Timespec (D : Duration) return timespec is
  65       S : time_t;
  66       F : Duration;
  67    begin
  68       S := time_t (Long_Long_Integer (D));
  69       F := D - Duration (S);
  70
  71       --  If F has negative value due to round-up, adjust for positive F value
  72
  73       if F < 0.0 then S := S - 1; F := F + 1.0; end if;
  74       return timespec'(tv_sec => S,
  75                        tv_nsec => long (Long_Long_Integer (F * 10#1#E9)));
  76    end To_Timespec;
  77
  78    function To_Duration (TV : struct_timeval) return Duration is
  79    begin
  80       return Duration (TV.tv_sec) + Duration (TV.tv_usec) / 10#1#E6;
  81    end To_Duration;
  82
  83    function To_Timeval (D : Duration) return struct_timeval is
  84       S : int;
  85       F : Duration;
  86    begin
  87       S := int (Long_Long_Integer (D));
  88       F := D - Duration (S);
  89
  90       --  If F has negative value due to a round-up, adjust for positive F
  91       --  value.
  92       if F < 0.0 then S := S - 1; F := F + 1.0; end if;
  93       return
  94         struct_timeval'
  95           (tv_sec  => S,
  96            tv_usec => int (Long_Long_Integer (F * 10#1#E6)));
  97    end To_Timeval;
  98
  99    procedure pthread_init is
 100    begin
 101       null;
 102    end pthread_init;
 103
 104    function Get_Stack_Base (thread : pthread_t) return Address is
 105       pragma Warnings (Off, thread);
 106
 107    begin
 108       return Null_Address;
 109    end Get_Stack_Base;
 110
 111    function Get_Page_Size return size_t is
 112    begin
 113       return 0;
 114    end Get_Page_Size;
 115
 116    function Get_Page_Size return Address is
 117    begin
 118       return 0;
 119    end Get_Page_Size;
 120
 121 end System.OS_Interface;