gcc/ada/libgnarl/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) 1991-2017, Florida State University             --
  10 --          Copyright (C) 1995-2017, Free Software Foundation, Inc.         --
  11 --                                                                          --
  12 -- GNAT 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 3,  or (at your option) any later ver- --
  15 -- sion.  GNAT 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.                                     --
  18 --                                                                          --
  19 -- As a special exception under Section 7 of GPL version 3, you are granted --
  20 -- additional permissions described in the GCC Runtime Library Exception,   --
  21 -- version 3.1, as published by the Free Software Foundation.               --
  22 --                                                                          --
  23 -- You should have received a copy of the GNU General Public License and    --
  24 -- a copy of the GCC Runtime Library Exception along with this program;     --
  25 -- see the files COPYING3 and COPYING.RUNTIME respectively.  If not, see    --
  26 -- <http://www.gnu.org/licenses/>.                                          --
  27 --                                                                          --
  28 -- GNARL was developed by the GNARL team at Florida State University. It is --
  29 -- now maintained by Ada Core Technologies Inc. in cooperation with Florida --
  30 -- State University (http://www.gnat.com).                                  --
  31 --                                                                          --
  32 -- The GNARL files that were developed for RTEMS are maintained by  On-Line --
  33 -- Applications Research Corporation (http://www.oarcorp.com)  in  coopera- --
  34 -- tion with Ada Core Technologies Inc. and Florida State University.       --
  35 --                                                                          --
  36 ------------------------------------------------------------------------------
  37
  38 --  This is the RTEMS version of this package
  39
  40 --  This package encapsulates all direct interfaces to OS services
  41 --  that are needed by children of System.
  42
  43 pragma Polling (Off);
  44 --  Turn off polling, we do not want ATC polling to take place during
  45 --  tasking operations. It causes infinite loops and other problems.
  46
  47 with Interfaces.C; use Interfaces.C;
  48 package body System.OS_Interface is
  49
  50    -----------------
  51    -- To_Duration --
  52    -----------------
  53
  54    function To_Duration (TS : timespec) return Duration is
  55    begin
  56       return Duration (TS.tv_sec) + Duration (TS.tv_nsec) / 10#1#E9;
  57    end To_Duration;
  58
  59    ------------------------
  60    -- To_Target_Priority --
  61    ------------------------
  62
  63    function To_Target_Priority
  64      (Prio : System.Any_Priority) return Interfaces.C.int
  65    is
  66    begin
  67       return Interfaces.C.int (Prio);
  68    end To_Target_Priority;
  69
  70    -----------------
  71    -- To_Timespec --
  72    -----------------
  73
  74    function To_Timespec (D : Duration) return timespec is
  75       S : time_t;
  76       F : Duration;
  77    begin
  78       S := time_t (Long_Long_Integer (D));
  79       F := D - Duration (S);
  80
  81       --  If F has negative value due to round-up, adjust for positive F value
  82
  83       if F < 0.0 then
  84          S := S - 1;
  85          F := F + 1.0;
  86       end if;
  87       return timespec'(tv_sec => S,
  88                        tv_nsec => long (Long_Long_Integer (F * 10#1#E9)));
  89    end To_Timespec;
  90
  91    ------------------
  92    -- pthread_init --
  93    ------------------
  94
  95    procedure pthread_init is
  96    begin
  97       null;
  98    end pthread_init;
  99
 100    --------------------
 101    -- Get_Stack_Base --
 102    --------------------
 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    -----------------
 112    -- sigaltstack --
 113    -----------------
 114
 115    function sigaltstack
 116      (ss  : not null access stack_t;
 117       oss : access stack_t) return int is
 118       pragma Unreferenced (ss);
 119       pragma Unreferenced (oss);
 120    begin
 121       return 0;
 122    end sigaltstack;
 123
 124    -----------------------------------
 125    -- pthread_rwlockattr_setkind_np --
 126    -----------------------------------
 127
 128    function pthread_rwlockattr_setkind_np
 129      (attr : access pthread_rwlockattr_t;
 130       pref : int) return int is
 131       pragma Unreferenced (attr);
 132       pragma Unreferenced (pref);
 133    begin
 134       return 0;
 135    end pthread_rwlockattr_setkind_np;
 136
 137 end System.OS_Interface;