PR rtl-optimization/79386
[official-gcc.git] / gcc / ada / s-osprim-unix.adb
blob732a15c5c32b2f61bc859d3b4ab1ee34c73cf217
1 ------------------------------------------------------------------------------
2 -- --
3 -- GNAT RUN-TIME LIBRARY (GNARL) COMPONENTS --
4 -- --
5 -- S Y S T E M . O S _ P R I M I T I V E S --
6 -- --
7 -- B o d y --
8 -- --
9 -- Copyright (C) 1998-2015, 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 ------------------------------------------------------------------------------
32 -- This version uses gettimeofday and select
33 -- This file is suitable for OpenNT, Dec Unix and SCO UnixWare.
35 package body System.OS_Primitives is
37 -- ??? These definitions are duplicated from System.OS_Interface
38 -- because we don't want to depend on any package. Consider removing
39 -- these declarations in System.OS_Interface and move these ones in
40 -- the spec.
42 type struct_timeval is record
43 tv_sec : Integer;
44 tv_usec : Integer;
45 end record;
46 pragma Convention (C, struct_timeval);
48 procedure gettimeofday
49 (tv : not null access struct_timeval;
50 tz : Address := Null_Address);
51 pragma Import (C, gettimeofday, "gettimeofday");
53 procedure C_select
54 (n : Integer := 0;
55 readfds,
56 writefds,
57 exceptfds : Address := Null_Address;
58 timeout : not null access struct_timeval);
59 pragma Import (C, C_select, "select");
61 -----------
62 -- Clock --
63 -----------
65 function Clock return Duration is
66 TV : aliased struct_timeval;
68 begin
69 gettimeofday (TV'Access);
70 return Duration (TV.tv_sec) + Duration (TV.tv_usec) / 10#1#E6;
71 end Clock;
73 -----------------
74 -- Timed_Delay --
75 -----------------
77 procedure Timed_Delay
78 (Time : Duration;
79 Mode : Integer)
81 Rel_Time : Duration;
82 Abs_Time : Duration;
83 Base_Time : constant Duration := Clock;
84 Check_Time : Duration := Base_Time;
85 timeval : aliased struct_timeval;
87 begin
88 if Mode = Relative then
89 Rel_Time := Time;
90 Abs_Time := Time + Check_Time;
91 else
92 Rel_Time := Time - Check_Time;
93 Abs_Time := Time;
94 end if;
96 if Rel_Time > 0.0 then
97 loop
98 timeval.tv_sec := Integer (Rel_Time);
100 if Duration (timeval.tv_sec) > Rel_Time then
101 timeval.tv_sec := timeval.tv_sec - 1;
102 end if;
104 timeval.tv_usec :=
105 Integer ((Rel_Time - Duration (timeval.tv_sec)) * 10#1#E6);
107 C_select (timeout => timeval'Unchecked_Access);
108 Check_Time := Clock;
110 exit when Abs_Time <= Check_Time or else Check_Time < Base_Time;
112 Rel_Time := Abs_Time - Check_Time;
113 end loop;
114 end if;
115 end Timed_Delay;
117 ----------------
118 -- Initialize --
119 ----------------
121 procedure Initialize is
122 begin
123 null;
124 end Initialize;
126 end System.OS_Primitives;