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) 1999-2006 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 2,  or (at your option) any later ver- --
  14 -- sion. GNARL 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.  See the GNU General Public License --
  17 -- for  more details.  You should have  received  a copy of the GNU General --
  18 -- Public License  distributed with GNARL; see file COPYING.  If not, write --
  19 -- to  the  Free Software Foundation,  51  Franklin  Street,  Fifth  Floor, --
  20 -- Boston, MA 02110-1301, USA.                                              --
  21 --                                                                          --
  22 -- As a special exception,  if other files  instantiate  generics from this --
  23 -- unit, or you link  this unit with other files  to produce an executable, --
  24 -- this  unit  does not  by itself cause  the resulting  executable  to  be --
  25 -- covered  by the  GNU  General  Public  License.  This exception does not --
  26 -- however invalidate  any other reasons why  the executable file  might be --
  27 -- covered by the  GNU Public License.                                      --
  28 --                                                                          --
  29 -- GNARL was developed by the GNARL team at Florida State University.       --
  30 -- Extensive contributions were provided by Ada Core Technologies, Inc.     --
  31 --                                                                          --
  32 ------------------------------------------------------------------------------
  33
  34 --  This is a Darwin Threads version of this package
  35
  36 pragma Polling (Off);
  37 --  Turn off polling, we do not want ATC polling to take place during
  38 --  tasking operations. It causes infinite loops and other problems.
  39
  40 package body System.OS_Interface is
  41
  42    use Interfaces.C;
  43
  44    -----------------
  45    -- To_Duration --
  46    -----------------
  47
  48    function To_Duration (TS : timespec) return Duration is
  49    begin
  50       return Duration (TS.tv_sec) + Duration (TS.tv_nsec) / 10#1#E9;
  51    end To_Duration;
  52
  53    function To_Duration (TV : struct_timeval) return Duration is
  54    begin
  55       return Duration (TV.tv_sec) + Duration (TV.tv_usec) / 10#1#E6;
  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
  77    begin
  78       S := time_t (Long_Long_Integer (D));
  79       F := D - Duration (S);
  80
  81       --  If F has negative value due to a round-up, adjust for positive F
  82       --  value.
  83
  84       if F < 0.0 then
  85          S := S - 1;
  86          F := F + 1.0;
  87       end if;
  88
  89       return timespec'(tv_sec => S,
  90         tv_nsec => int32_t (Long_Long_Integer (F * 10#1#E9)));
  91    end To_Timespec;
  92
  93    ----------------
  94    -- To_Timeval --
  95    ----------------
  96
  97    function To_Timeval (D : Duration) return struct_timeval is
  98       S : int32_t;
  99       F : Duration;
 100
 101    begin
 102       S := int32_t (D);
 103       F := D - Duration (S);
 104
 105       --  If F has negative value due to a round-up, adjust for positive F
 106       --  value.
 107
 108       if F < 0.0 then
 109          S := S - 1;
 110          F := F + 1.0;
 111       end if;
 112
 113       return struct_timeval'
 114                (Tv_Sec  => S,
 115                 tv_usec => int32_t (Long_Long_Integer (F * 10#1#E6)));
 116    end To_Timeval;
 117
 118    -------------------
 119    -- clock_gettime --
 120    -------------------
 121
 122    function clock_gettime
 123      (clock_id : clockid_t;
 124       tp       : access timespec) return int
 125    is
 126       pragma Unreferenced (clock_id);
 127       Result : int;
 128       tv     : aliased struct_timeval;
 129
 130       function gettimeofday
 131         (tv : access struct_timeval;
 132          tz : System.Address := System.Null_Address) return int;
 133       pragma Import (C, gettimeofday, "gettimeofday");
 134
 135    begin
 136       Result := gettimeofday (tv'Unchecked_Access);
 137       tp.all := To_Timespec (To_Duration (tv));
 138       return Result;
 139    end clock_gettime;
 140
 141    -----------------
 142    -- sched_yield --
 143    -----------------
 144
 145    function sched_yield return int is
 146       procedure sched_yield_base (arg : System.Address);
 147       pragma Import (C, sched_yield_base, "pthread_yield_np");
 148
 149    begin
 150       sched_yield_base (System.Null_Address);
 151       return 0;
 152    end sched_yield;
 153
 154    ------------------
 155    -- pthread_init --
 156    ------------------
 157
 158    procedure pthread_init is
 159    begin
 160       null;
 161    end pthread_init;
 162
 163    ----------------
 164    -- Stack_Base --
 165    ----------------
 166
 167    function Get_Stack_Base (thread : pthread_t) return Address is
 168       pragma Unreferenced (thread);
 169    begin
 170       return System.Null_Address;
 171    end Get_Stack_Base;
 172
 173 end System.OS_Interface;