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
34pragma 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
38package 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
170end System.OS_Interface;
171