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) 1995-2014, 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 version is for POSIX-like operating systems
34
35pragma Polling (Off);
36--  Turn off polling, we do not want ATC polling to take place during
37--  tasking operations. It causes infinite loops and other problems.
38
39--  This package encapsulates all direct interfaces to OS services
40--  that are needed by children of System.
41
42with Interfaces.C; use Interfaces.C;
43package body System.OS_Interface is
44
45   --------------------
46   -- Get_Stack_Base --
47   --------------------
48
49   function Get_Stack_Base (thread : pthread_t) return Address is
50      pragma Warnings (Off, thread);
51
52   begin
53      return Null_Address;
54   end Get_Stack_Base;
55
56   ------------------
57   -- pthread_init --
58   ------------------
59
60   procedure pthread_init is
61   begin
62      null;
63   end pthread_init;
64
65   -----------------
66   -- To_Duration --
67   -----------------
68
69   function To_Duration (TS : timespec) return Duration is
70   begin
71      return Duration (TS.tv_sec) + Duration (TS.tv_nsec) / 10#1#E9;
72   end To_Duration;
73
74   ------------------------
75   -- To_Target_Priority --
76   ------------------------
77
78   function To_Target_Priority
79     (Prio : System.Any_Priority) return Interfaces.C.int
80   is
81   begin
82      return Interfaces.C.int (Prio);
83   end To_Target_Priority;
84
85   -----------------
86   -- To_Timespec --
87   -----------------
88
89   function To_Timespec (D : Duration) return timespec is
90      S : time_t;
91      F : Duration;
92
93   begin
94      S := time_t (Long_Long_Integer (D));
95      F := D - Duration (S);
96
97      --  If F has negative value due to a round-up, adjust for positive F
98      --  value.
99
100      if F < 0.0 then
101         S := S - 1;
102         F := F + 1.0;
103      end if;
104
105      return timespec'(tv_sec => S,
106                       tv_nsec => long (Long_Long_Integer (F * 10#1#E9)));
107   end To_Timespec;
108
109end System.OS_Interface;
110