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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) 1992-2009 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 the IRIX version of this package
33
34 -- This package encapsulates all direct interfaces to OS services that are
35 -- needed by children of System.
36
37 pragma Polling (Off);
38 -- Turn off polling, we do not want ATC polling to take place during tasking
39 -- operations. It causes infinite loops and other problems.
40
41 with Interfaces.C; use Interfaces.C;
42
43 package body System.OS_Interface is
44
45 ------------------
46 -- pthread_init --
47 ------------------
48
49 procedure pthread_init is
50 begin
51 null;
52 end pthread_init;
53
54 -----------------
55 -- To_Duration --
56 -----------------
57
58 function To_Duration (TS : timespec) return Duration is
59 begin
60 return Duration (TS.tv_sec) + Duration (TS.tv_nsec) / 10#1#E9;
61 end To_Duration;
62
63 function To_Duration (TV : struct_timeval) return Duration is
64 begin
65 return Duration (TV.tv_sec) + Duration (TV.tv_usec) / 10#1#E6;
66 end To_Duration;
67
68 -----------------
69 -- To_Timespec --
70 -----------------
71
72 function To_Timespec (D : Duration) return timespec is
73 S : time_t;
74 F : Duration;
75
76 begin
77 S := time_t (Long_Long_Integer (D));
78 F := D - Duration (S);
79
80 -- If F has negative value due to a round-up, adjust for positive F
81 -- value.
82
83 if F < 0.0 then
84 S := S - 1;
85 F := F + 1.0;
86 end if;
87
88 return timespec'(tv_sec => S,
89 tv_nsec => long (Long_Long_Integer (F * 10#1#E9)));
90 end To_Timespec;
91
92 ----------------
93 -- To_Timeval --
94 ----------------
95
96 function To_Timeval (D : Duration) return struct_timeval is
97 S : time_t;
98 F : Duration;
99
100 begin
101 S := time_t (Long_Long_Integer (D));
102 F := D - Duration (S);
103
104 -- If F has negative value due to a round-up, adjust for positive F
105 -- value.
106
107 if F < 0.0 then
108 S := S - 1;
109 F := F + 1.0;
110 end if;
111
112 return
113 struct_timeval'
114 (tv_sec => S,
115 tv_usec => time_t (Long_Long_Integer (F * 10#1#E6)));
116 end To_Timeval;
117
118 end System.OS_Interface;