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) 1991-2009 Florida State University              --
  10 --                                                                          --
  11 -- GNAT 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 3,  or (at your option) any later ver- --
  14 -- sion.  GNAT 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.                                     --
  17 --                                                                          --
  18 -- As a special exception under Section 7 of GPL version 3, you are granted --
  19 -- additional permissions described in the GCC Runtime Library Exception,   --
  20 -- version 3.1, as published by the Free Software Foundation.               --
  21 --                                                                          --
  22 -- You should have received a copy of the GNU General Public License and    --
  23 -- a copy of the GCC Runtime Library Exception along with this program;     --
  24 -- see the files COPYING3 and COPYING.RUNTIME respectively.  If not, see    --
  25 -- <http://www.gnu.org/licenses/>.                                          --
  26 --                                                                          --
  27 -- GNARL was developed by the GNARL team at Florida State University. It is --
  28 -- now maintained by Ada Core Technologies Inc. in cooperation with Florida --
  29 -- State University (http://www.gnat.com).                                  --
  30 --                                                                          --
  31 -- The GNARL files that were developed for RTEMS are maintained by  On-Line --
  32 -- Applications Research Corporation (http://www.oarcorp.com)  in  coopera- --
  33 -- tion with Ada Core Technologies Inc. and Florida State University.       --
  34 --                                                                          --
  35 ------------------------------------------------------------------------------
  36
  37 --  This is the RTEMS version of this package
  38
  39 --  This package encapsulates all direct interfaces to OS services
  40 --  that are needed by children of System.
  41
  42 pragma Polling (Off);
  43 --  Turn off polling, we do not want ATC polling to take place during
  44 --  tasking operations. It causes infinite loops and other problems.
  45
  46 with Interfaces.C; use Interfaces.C;
  47 package body System.OS_Interface is
  48
  49    -----------------
  50    -- To_Duration --
  51    -----------------
  52
  53    function To_Duration (TS : timespec) return Duration is
  54    begin
  55       return Duration (TS.tv_sec) + Duration (TS.tv_nsec) / 10#1#E9;
  56    end To_Duration;
  57
  58    ------------------------
  59    -- To_Target_Priority --
  60    ------------------------
  61
  62    function To_Target_Priority
  63      (Prio : System.Any_Priority) return Interfaces.C.int
  64    is
  65    begin
  66       return Interfaces.C.int (Prio);
  67    end To_Target_Priority;
  68
  69    -----------------
  70    -- To_Timespec --
  71    -----------------
  72
  73    function To_Timespec (D : Duration) return timespec is
  74       S : time_t;
  75       F : Duration;
  76    begin
  77       S := time_t (Long_Long_Integer (D));
  78       F := D - Duration (S);
  79
  80       --  If F has negative value due to round-up, adjust for positive F value
  81
  82       if F < 0.0 then
  83          S := S - 1;
  84          F := F + 1.0;
  85       end if;
  86       return timespec'(tv_sec => S,
  87                        tv_nsec => long (Long_Long_Integer (F * 10#1#E9)));
  88    end To_Timespec;
  89
  90    ------------------
  91    -- pthread_init --
  92    ------------------
  93
  94    procedure pthread_init is
  95    begin
  96       null;
  97    end pthread_init;
  98
  99    --------------------
 100    -- Get_Stack_Base --
 101    --------------------
 102
 103    function Get_Stack_Base (thread : pthread_t) return Address is
 104       pragma Warnings (Off, thread);
 105
 106    begin
 107       return Null_Address;
 108    end Get_Stack_Base;
 109
 110    -----------------
 111    -- sigaltstack --
 112    -----------------
 113
 114    function sigaltstack
 115      (ss  : not null access stack_t;
 116       oss : access stack_t) return int is
 117       pragma Unreferenced (ss);
 118       pragma Unreferenced (oss);
 119    begin
 120       return 0;
 121    end sigaltstack;
 122
 123    -----------------------------------
 124    -- pthread_rwlockattr_setkind_np --
 125    -----------------------------------
 126
 127    function pthread_rwlockattr_setkind_np
 128      (attr : access pthread_rwlockattr_t;
 129       pref : int) return int is
 130       pragma Unreferenced (attr);
 131       pragma Unreferenced (pref);
 132    begin
 133       return 0;
 134    end pthread_rwlockattr_setkind_np;
 135
 136 end System.OS_Interface;