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) 1991-1994, Florida State University            --
10--                     Copyright (C) 1995-2010, AdaCore                     --
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.       --
29-- Extensive contributions were provided by Ada Core Technologies, Inc.     --
30--                                                                          --
31------------------------------------------------------------------------------
32
33--  This is a GNU/LinuxThreads, Solaris pthread and HP-UX pthread version
34--  of this package.
35
36pragma 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--  This package encapsulates all direct interfaces to OS services
41--  that are needed by children of System.
42
43with Interfaces.C; use Interfaces.C;
44package body System.OS_Interface is
45
46   --------------------
47   -- Get_Stack_Base --
48   --------------------
49
50   function Get_Stack_Base (thread : pthread_t) return Address is
51      pragma Warnings (Off, thread);
52
53   begin
54      return Null_Address;
55   end Get_Stack_Base;
56
57   ------------------
58   -- pthread_init --
59   ------------------
60
61   procedure pthread_init is
62   begin
63      null;
64   end pthread_init;
65
66   -----------------
67   -- To_Duration --
68   -----------------
69
70   function To_Duration (TS : timespec) return Duration is
71   begin
72      return Duration (TS.tv_sec) + Duration (TS.tv_nsec) / 10#1#E9;
73   end To_Duration;
74
75   ------------------------
76   -- To_Target_Priority --
77   ------------------------
78
79   function To_Target_Priority
80     (Prio : System.Any_Priority) return Interfaces.C.int
81   is
82   begin
83      return Interfaces.C.int (Prio);
84   end To_Target_Priority;
85
86   -----------------
87   -- To_Timespec --
88   -----------------
89
90   function To_Timespec (D : Duration) return timespec is
91      S : time_t;
92      F : Duration;
93
94   begin
95      S := time_t (Long_Long_Integer (D));
96      F := D - Duration (S);
97
98      --  If F has negative value due to a round-up, adjust for positive F
99      --  value.
100
101      if F < 0.0 then
102         S := S - 1;
103         F := F + 1.0;
104      end if;
105
106      return timespec'(tv_sec => S,
107                       tv_nsec => long (Long_Long_Integer (F * 10#1#E9)));
108   end To_Timespec;
109
110end System.OS_Interface;
111