gcc/ada/s-osinte-darwin.adb

   1 ------------------------------------------------------------------------------
   2 --                                                                          --
   3 --                 GNAT 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) 1999-2009 Free Software Foundation, Inc.         --
  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 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.       --
  28 -- Extensive contributions were provided by Ada Core Technologies, Inc.     --
  29 --                                                                          --
  30 ------------------------------------------------------------------------------
  31
  32 --  This is a Darwin Threads version of this package
  33
  34 pragma Polling (Off);
  35 --  Turn off polling, we do not want ATC polling to take place during
  36 --  tasking operations. It causes infinite loops and other problems.
  37
  38 package body System.OS_Interface is
  39
  40    use Interfaces.C;
  41
  42    -----------------
  43    -- To_Duration --
  44    -----------------
  45
  46    function To_Duration (TS : timespec) return Duration is
  47    begin
  48       return Duration (TS.tv_sec) + Duration (TS.tv_nsec) / 10#1#E9;
  49    end To_Duration;
  50
  51    function To_Duration (TV : struct_timeval) return Duration is
  52    begin
  53       return Duration (TV.tv_sec) + Duration (TV.tv_usec) / 10#1#E6;
  54    end To_Duration;
  55
  56    ------------------------
  57    -- To_Target_Priority --
  58    ------------------------
  59
  60    function To_Target_Priority
  61      (Prio : System.Any_Priority) return Interfaces.C.int
  62    is
  63    begin
  64       return Interfaces.C.int (Prio);
  65    end To_Target_Priority;
  66
  67    -----------------
  68    -- To_Timespec --
  69    -----------------
  70
  71    function To_Timespec (D : Duration) return timespec is
  72       S : time_t;
  73       F : Duration;
  74
  75    begin
  76       S := time_t (Long_Long_Integer (D));
  77       F := D - Duration (S);
  78
  79       --  If F has negative value due to a round-up, adjust for positive F
  80       --  value.
  81
  82       if F < 0.0 then
  83          S := S - 1;
  84          F := F + 1.0;
  85       end if;
  86
  87       return timespec'(tv_sec => S,
  88         tv_nsec => int32_t (Long_Long_Integer (F * 10#1#E9)));
  89    end To_Timespec;
  90
  91    ----------------
  92    -- To_Timeval --
  93    ----------------
  94
  95    function To_Timeval (D : Duration) return struct_timeval is
  96       S : time_t;
  97       F : Duration;
  98
  99    begin
 100       S := time_t (D);
 101       F := D - Duration (S);
 102
 103       --  If F has negative value due to a round-up, adjust for positive F
 104       --  value.
 105
 106       if F < 0.0 then
 107          S := S - 1;
 108          F := F + 1.0;
 109       end if;
 110
 111       return struct_timeval'
 112                (Tv_Sec  => S,
 113                 tv_usec => int32_t (Long_Long_Integer (F * 10#1#E6)));
 114    end To_Timeval;
 115
 116    -------------------
 117    -- clock_gettime --
 118    -------------------
 119
 120    function clock_gettime
 121      (clock_id : clockid_t;
 122       tp       : access timespec) return int
 123    is
 124       pragma Unreferenced (clock_id);
 125       Result : int;
 126       tv     : aliased struct_timeval;
 127
 128       function gettimeofday
 129         (tv : access struct_timeval;
 130          tz : System.Address := System.Null_Address) return int;
 131       pragma Import (C, gettimeofday, "gettimeofday");
 132
 133    begin
 134       Result := gettimeofday (tv'Unchecked_Access);
 135       tp.all := To_Timespec (To_Duration (tv));
 136       return Result;
 137    end clock_gettime;
 138
 139    -----------------
 140    -- sched_yield --
 141    -----------------
 142
 143    function sched_yield return int is
 144       procedure sched_yield_base (arg : System.Address);
 145       pragma Import (C, sched_yield_base, "pthread_yield_np");
 146
 147    begin
 148       sched_yield_base (System.Null_Address);
 149       return 0;
 150    end sched_yield;
 151
 152    ------------------
 153    -- pthread_init --
 154    ------------------
 155
 156    procedure pthread_init is
 157    begin
 158       null;
 159    end pthread_init;
 160
 161    ----------------
 162    -- Stack_Base --
 163    ----------------
 164
 165    function Get_Stack_Base (thread : pthread_t) return Address is
 166       pragma Unreferenced (thread);
 167    begin
 168       return System.Null_Address;
 169    end Get_Stack_Base;
 170
 171 end System.OS_Interface;