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comparison gcc/ada/libgnat/s-osprim__rtems.adb @ 131:84e7813d76e9

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gcc-8.2
author mir3636
date Thu, 25 Oct 2018 07:37:49 +0900
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children 1830386684a0
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111:04ced10e8804 131:84e7813d76e9
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) 1998-2018, 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 version is for POSIX-like operating systems
33
34 package body System.OS_Primitives is
35
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.
40
41 type time_t is new Long_Long_Integer;
42
43 type timespec is record
44 tv_sec : time_t;
45 tv_nsec : Long_Integer;
46 end record;
47 pragma Convention (C, timespec);
48
49 function nanosleep (rqtp, rmtp : not null access timespec) return Integer;
50 pragma Import (C, nanosleep, "nanosleep");
51
52 -----------
53 -- Clock --
54 -----------
55
56 function Clock return Duration is
57
58 type timeval is record
59 tv_sec : time_t;
60 tv_usec : Long_Integer;
61 end record;
62 pragma Convention (C, timeval);
63
64 procedure timeval_to_duration
65 (T : not null access timeval;
66 sec : not null access Long_Long_Integer;
67 usec : not null access Long_Integer);
68 pragma Import (C, timeval_to_duration, "__gnat_timeval_to_duration");
69
70 Micro : constant := 10**6;
71 sec : aliased Long_Long_Integer;
72 usec : aliased Long_Integer;
73 TV : aliased timeval;
74 Result : Integer;
75 pragma Unreferenced (Result);
76
77 function gettimeofday
78 (Tv : access timeval;
79 Tz : System.Address := System.Null_Address) return Integer;
80 pragma Import (C, gettimeofday, "gettimeofday");
81
82 begin
83 -- The return codes for gettimeofday are as follows (from man pages):
84 -- EPERM settimeofday is called by someone other than the superuser
85 -- EINVAL Timezone (or something else) is invalid
86 -- EFAULT One of tv or tz pointed outside accessible address space
87
88 -- None of these codes signal a potential clock skew, hence the return
89 -- value is never checked.
90
91 Result := gettimeofday (TV'Access, System.Null_Address);
92 timeval_to_duration (TV'Access, sec'Access, usec'Access);
93 return Duration (sec) + Duration (usec) / Micro;
94 end Clock;
95
96 -----------------
97 -- To_Timespec --
98 -----------------
99
100 function To_Timespec (D : Duration) return timespec;
101
102 function To_Timespec (D : Duration) return timespec is
103 S : time_t;
104 F : Duration;
105
106 begin
107 S := time_t (Long_Long_Integer (D));
108 F := D - Duration (S);
109
110 -- If F has negative value due to a round-up, adjust for positive F
111 -- value.
112
113 if F < 0.0 then
114 S := S - 1;
115 F := F + 1.0;
116 end if;
117
118 return
119 timespec'(tv_sec => S,
120 tv_nsec => Long_Integer (Long_Long_Integer (F * 10#1#E9)));
121 end To_Timespec;
122
123 -----------------
124 -- Timed_Delay --
125 -----------------
126
127 procedure Timed_Delay
128 (Time : Duration;
129 Mode : Integer)
130 is
131 Request : aliased timespec;
132 Remaind : aliased timespec;
133 Rel_Time : Duration;
134 Abs_Time : Duration;
135 Base_Time : constant Duration := Clock;
136 Check_Time : Duration := Base_Time;
137
138 Result : Integer;
139 pragma Unreferenced (Result);
140
141 begin
142 if Mode = Relative then
143 Rel_Time := Time;
144 Abs_Time := Time + Check_Time;
145 else
146 Rel_Time := Time - Check_Time;
147 Abs_Time := Time;
148 end if;
149
150 if Rel_Time > 0.0 then
151 loop
152 Request := To_Timespec (Rel_Time);
153 Result := nanosleep (Request'Access, Remaind'Access);
154 Check_Time := Clock;
155
156 exit when Abs_Time <= Check_Time or else Check_Time < Base_Time;
157
158 Rel_Time := Abs_Time - Check_Time;
159 end loop;
160 end if;
161 end Timed_Delay;
162
163 ----------------
164 -- Initialize --
165 ----------------
166
167 procedure Initialize is
168 begin
169 null;
170 end Initialize;
171
172 end System.OS_Primitives;