File : s-osinte-posix.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) 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 -- --
20 -- --
21 -- --
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
35 pragma 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
42 with Interfaces.C; use Interfaces.C;
43 package 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
109 end System.OS_Interface;