PR rtl-optimization/79386
[official-gcc.git] / gcc / ada / s-osprim-x32.adb
blobb457f5b3201132e6dc931649b1a1e7cf36826600
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) 2013-2015, 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 is for Linux/x32
34 package body System.OS_Primitives is
36 -- ??? These definitions are duplicated from System.OS_Interface
37 -- because we don't want to depend on any package. Consider removing
38 -- these declarations in System.OS_Interface and move these ones in
39 -- the spec.
41 type time_t is new Long_Long_Integer;
43 type timespec is record
44 tv_sec : time_t;
45 tv_nsec : Long_Long_Integer;
46 end record;
47 pragma Convention (C, timespec);
49 function nanosleep (rqtp, rmtp : not null access timespec) return Integer;
50 pragma Import (C, nanosleep, "nanosleep");
52 -----------
53 -- Clock --
54 -----------
56 function Clock return Duration is
57 type timeval is array (1 .. 2) of Long_Long_Integer;
59 procedure timeval_to_duration
60 (T : not null access timeval;
61 sec : not null access Long_Integer;
62 usec : not null access Long_Integer);
63 pragma Import (C, timeval_to_duration, "__gnat_timeval_to_duration");
65 Micro : constant := 10**6;
66 sec : aliased Long_Integer;
67 usec : aliased Long_Integer;
68 TV : aliased timeval;
69 Result : Integer;
70 pragma Unreferenced (Result);
72 function gettimeofday
73 (Tv : access timeval;
74 Tz : System.Address := System.Null_Address) return Integer;
75 pragma Import (C, gettimeofday, "gettimeofday");
77 begin
78 -- The return codes for gettimeofday are as follows (from man pages):
79 -- EPERM settimeofday is called by someone other than the superuser
80 -- EINVAL Timezone (or something else) is invalid
81 -- EFAULT One of tv or tz pointed outside accessible address space
83 -- None of these codes signal a potential clock skew, hence the return
84 -- value is never checked.
86 Result := gettimeofday (TV'Access, System.Null_Address);
87 timeval_to_duration (TV'Access, sec'Access, usec'Access);
88 return Duration (sec) + Duration (usec) / Micro;
89 end Clock;
91 -----------------
92 -- To_Timespec --
93 -----------------
95 function To_Timespec (D : Duration) return timespec;
97 function To_Timespec (D : Duration) return timespec is
98 S : time_t;
99 F : Duration;
101 begin
102 S := time_t (Long_Long_Integer (D));
103 F := D - Duration (S);
105 -- If F has negative value due to a round-up, adjust for positive F
106 -- value.
108 if F < 0.0 then
109 S := S - 1;
110 F := F + 1.0;
111 end if;
113 return
114 timespec'(tv_sec => S,
115 tv_nsec => Long_Long_Integer (F * 10#1#E9));
116 end To_Timespec;
118 -----------------
119 -- Timed_Delay --
120 -----------------
122 procedure Timed_Delay
123 (Time : Duration;
124 Mode : Integer)
126 Request : aliased timespec;
127 Remaind : aliased timespec;
128 Rel_Time : Duration;
129 Abs_Time : Duration;
130 Base_Time : constant Duration := Clock;
131 Check_Time : Duration := Base_Time;
133 Result : Integer;
134 pragma Unreferenced (Result);
136 begin
137 if Mode = Relative then
138 Rel_Time := Time;
139 Abs_Time := Time + Check_Time;
140 else
141 Rel_Time := Time - Check_Time;
142 Abs_Time := Time;
143 end if;
145 if Rel_Time > 0.0 then
146 loop
147 Request := To_Timespec (Rel_Time);
148 Result := nanosleep (Request'Access, Remaind'Access);
149 Check_Time := Clock;
151 exit when Abs_Time <= Check_Time or else Check_Time < Base_Time;
153 Rel_Time := Abs_Time - Check_Time;
154 end loop;
155 end if;
156 end Timed_Delay;
158 ----------------
159 -- Initialize --
160 ----------------
162 procedure Initialize is
163 begin
164 null;
165 end Initialize;
167 end System.OS_Primitives;