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    ------------------------
  52    -- To_Target_Priority --
  53    ------------------------
  54
  55    function To_Target_Priority
  56      (Prio : System.Any_Priority) return Interfaces.C.int
  57    is
  58    begin
  59       return Interfaces.C.int (Prio);
  60    end To_Target_Priority;
  61
  62    -----------------
  63    -- To_Timespec --
  64    -----------------
  65
  66    function To_Timespec (D : Duration) return timespec is
  67       S : time_t;
  68       F : Duration;
  69
  70    begin
  71       S := time_t (Long_Long_Integer (D));
  72       F := D - Duration (S);
  73
  74       --  If F has negative value due to a round-up, adjust for positive F
  75       --  value.
  76
  77       if F < 0.0 then
  78          S := S - 1;
  79          F := F + 1.0;
  80       end if;
  81
  82       return timespec'(tv_sec => S,
  83         tv_nsec => long (Long_Long_Integer (F * 10#1#E9)));
  84    end To_Timespec;
  85
  86    -------------------
  87    -- clock_gettime --
  88    -------------------
  89
  90    function clock_gettime
  91      (clock_id : clockid_t;
  92       tp       : access timespec) return int
  93    is
  94       pragma Unreferenced (clock_id);
  95
  96       --  Darwin Threads don't have clock_gettime, so use gettimeofday
  97
  98       use Interfaces;
  99
 100       type timeval is array (1 .. 2) of C.long;
 101
 102       procedure timeval_to_duration
 103         (T    : not null access timeval;
 104          sec  : not null access C.long;
 105          usec : not null access C.long);
 106       pragma Import (C, timeval_to_duration, "__gnat_timeval_to_duration");
 107
 108       Micro  : constant := 10**6;
 109       sec    : aliased C.long;
 110       usec   : aliased C.long;
 111       TV     : aliased timeval;
 112       Result : int;
 113
 114       function gettimeofday
 115         (Tv : access timeval;
 116          Tz : System.Address := System.Null_Address) return int;
 117       pragma Import (C, gettimeofday, "gettimeofday");
 118
 119    begin
 120       Result := gettimeofday (TV'Access, System.Null_Address);
 121       pragma Assert (Result = 0);
 122       timeval_to_duration (TV'Access, sec'Access, usec'Access);
 123       tp.all := To_Timespec (Duration (sec) + Duration (usec) / Micro);
 124       return Result;
 125    end clock_gettime;
 126
 127    -----------------
 128    -- sched_yield --
 129    -----------------
 130
 131    function sched_yield return int is
 132       procedure sched_yield_base (arg : System.Address);
 133       pragma Import (C, sched_yield_base, "pthread_yield_np");
 134
 135    begin
 136       sched_yield_base (System.Null_Address);
 137       return 0;
 138    end sched_yield;
 139
 140    --------------
 141    -- lwp_self --
 142    --------------
 143
 144    function lwp_self return Address is
 145       function pthread_mach_thread_np (thread : pthread_t) return Address;
 146       pragma Import (C, pthread_mach_thread_np, "pthread_mach_thread_np");
 147    begin
 148       return pthread_mach_thread_np (pthread_self);
 149    end lwp_self;
 150
 151    ------------------
 152    -- pthread_init --
 153    ------------------
 154
 155    procedure pthread_init is
 156    begin
 157       null;
 158    end pthread_init;
 159
 160    ----------------
 161    -- Stack_Base --
 162    ----------------
 163
 164    function Get_Stack_Base (thread : pthread_t) return Address is
 165       pragma Unreferenced (thread);
 166    begin
 167       return System.Null_Address;
 168    end Get_Stack_Base;
 169
 170 end System.OS_Interface;