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