gcc/ada/5rosinte.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 --                             $Revision: 1.7 $
  10 --                                                                          --
  11 --            Copyright (C) 1991-2000 Florida State University              --
  12 --                                                                          --
  13 -- GNARL is free software; you can  redistribute it  and/or modify it under --
  14 -- terms of the  GNU General Public License as published  by the Free Soft- --
  15 -- ware  Foundation;  either version 2,  or (at your option) any later ver- --
  16 -- sion. GNARL is distributed in the hope that it will be useful, but WITH- --
  17 -- OUT ANY WARRANTY;  without even the  implied warranty of MERCHANTABILITY --
  18 -- or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License --
  19 -- for  more details.  You should have  received  a copy of the GNU General --
  20 -- Public License  distributed with GNARL; see file COPYING.  If not, write --
  21 -- to  the Free Software Foundation,  59 Temple Place - Suite 330,  Boston, --
  22 -- MA 02111-1307, USA.                                                      --
  23 --                                                                          --
  24 -- As a special exception,  if other files  instantiate  generics from this --
  25 -- unit, or you link  this unit with other files  to produce an executable, --
  26 -- this  unit  does not  by itself cause  the resulting  executable  to  be --
  27 -- covered  by the  GNU  General  Public  License.  This exception does not --
  28 -- however invalidate  any other reasons why  the executable file  might be --
  29 -- covered by the  GNU Public License.                                      --
  30 --                                                                          --
  31 -- GNARL was developed by the GNARL team at Florida State University. It is --
  32 -- now maintained by Ada Core Technologies Inc. in cooperation with Florida --
  33 -- State University (http://www.gnat.com).                                  --
  34 --                                                                          --
  35 -- The GNARL files that were developed for RTEMS are maintained by  On-Line --
  36 -- Applications Research Corporation (http://www.oarcorp.com)  in  coopera- --
  37 -- tion with Ada Core Technologies Inc. and Florida State University.       --
  38 --                                                                          --
  39 ------------------------------------------------------------------------------
  40
  41 --  This is the RTEMS version of this package
  42
  43 --  This package encapsulates all direct interfaces to OS services
  44 --  that are needed by children of System.
  45
  46 pragma Polling (Off);
  47 --  Turn off polling, we do not want ATC polling to take place during
  48 --  tasking operations. It causes infinite loops and other problems.
  49
  50 with Interfaces.C; use Interfaces.C;
  51 package body System.OS_Interface is
  52
  53    -----------------
  54    -- To_Duration --
  55    -----------------
  56
  57    function To_Duration (TS : timespec) return Duration is
  58    begin
  59       return Duration (TS.tv_sec) + Duration (TS.tv_nsec) / 10#1#E9;
  60    end To_Duration;
  61
  62    -----------------
  63    -- To_Timespec --
  64    -----------------
  65
  66    function To_Timespec (D : Duration) return timespec is
  67       S : time_t;
  68       F : Duration;
  69    begin
  70       S := time_t (Long_Long_Integer (D));
  71       F := D - Duration (S);
  72
  73       --  If F has negative value due to a round-up, adjust for positive F
  74       --  value.
  75       if F < 0.0 then S := S - 1; F := F + 1.0; end if;
  76       return timespec' (tv_sec => S,
  77         tv_nsec => long (Long_Long_Integer (F * 10#1#E9)));
  78    end To_Timespec;
  79
  80
  81    function To_Duration (TV : struct_timeval) return Duration is
  82    begin
  83       return Duration (TV.tv_sec) + Duration (TV.tv_usec) / 10#1#E6;
  84    end To_Duration;
  85
  86    function To_Timeval (D : Duration) return struct_timeval is
  87       S : int;
  88       F : Duration;
  89    begin
  90       S := int (Long_Long_Integer (D));
  91       F := D - Duration (S);
  92
  93       --  If F has negative value due to a round-up, adjust for positive F
  94       --  value.
  95       if F < 0.0 then S := S - 1; F := F + 1.0; end if;
  96       return struct_timeval' (tv_sec => S,
  97         tv_usec => int (Long_Long_Integer (F * 10#1#E6)));
  98    end To_Timeval;
  99
 100    procedure pthread_init is
 101    begin
 102       null;
 103    end pthread_init;
 104
 105    function Get_Stack_Base (thread : pthread_t) return Address is
 106    begin
 107       return Null_Address;
 108    end Get_Stack_Base;
 109
 110    function Get_Page_Size return size_t is
 111    begin
 112       return 0;
 113    end Get_Page_Size;
 114
 115    function Get_Page_Size return Address is
 116    begin
 117       return 0;
 118    end Get_Page_Size;
 119
 120    function mprotect
 121      (addr : Address; len : size_t; prot : int) return int is
 122    begin
 123       return 0;
 124    end mprotect;
 125
 126 end System.OS_Interface;