1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
|
------------------------------------------------------------------------------
-- --
-- GNAT RUN-TIME LIBRARY (GNARL) COMPONENTS --
-- --
-- A D A . R E A L _ T I M E --
-- --
-- B o d y --
-- --
-- Copyright (C) 1991-1994, Florida State University --
-- Copyright (C) 1995-2010, AdaCore --
-- --
-- GNARL is free software; you can redistribute it and/or modify it under --
-- terms of the GNU General Public License as published by the Free Soft- --
-- ware Foundation; either version 2, or (at your option) any later ver- --
-- sion. GNARL is distributed in the hope that it will be useful, but WITH- --
-- OUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY --
-- or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License --
-- for more details. You should have received a copy of the GNU General --
-- Public License distributed with GNARL; see file COPYING. If not, write --
-- to the Free Software Foundation, 51 Franklin Street, Fifth Floor, --
-- Boston, MA 02110-1301, USA. --
-- --
-- As a special exception, if other files instantiate generics from this --
-- unit, or you link this unit with other files to produce an executable, --
-- this unit does not by itself cause the resulting executable to be --
-- covered by the GNU General Public License. This exception does not --
-- however invalidate any other reasons why the executable file might be --
-- covered by the GNU Public License. --
-- --
-- GNARL was developed by the GNARL team at Florida State University. --
-- Extensive contributions were provided by Ada Core Technologies, Inc. --
-- --
------------------------------------------------------------------------------
with System.Tasking;
package body Ada.Real_Time is
---------
-- "*" --
---------
-- Note that Constraint_Error may be propagated
function "*" (Left : Time_Span; Right : Integer) return Time_Span is
pragma Unsuppress (Overflow_Check);
begin
return Time_Span (Duration (Left) * Right);
end "*";
function "*" (Left : Integer; Right : Time_Span) return Time_Span is
pragma Unsuppress (Overflow_Check);
begin
return Time_Span (Left * Duration (Right));
end "*";
---------
-- "+" --
---------
-- Note that Constraint_Error may be propagated
function "+" (Left : Time; Right : Time_Span) return Time is
pragma Unsuppress (Overflow_Check);
begin
return Time (Duration (Left) + Duration (Right));
end "+";
function "+" (Left : Time_Span; Right : Time) return Time is
pragma Unsuppress (Overflow_Check);
begin
return Time (Duration (Left) + Duration (Right));
end "+";
function "+" (Left, Right : Time_Span) return Time_Span is
pragma Unsuppress (Overflow_Check);
begin
return Time_Span (Duration (Left) + Duration (Right));
end "+";
---------
-- "-" --
---------
-- Note that Constraint_Error may be propagated
function "-" (Left : Time; Right : Time_Span) return Time is
pragma Unsuppress (Overflow_Check);
begin
return Time (Duration (Left) - Duration (Right));
end "-";
function "-" (Left, Right : Time) return Time_Span is
pragma Unsuppress (Overflow_Check);
begin
return Time_Span (Duration (Left) - Duration (Right));
end "-";
function "-" (Left, Right : Time_Span) return Time_Span is
pragma Unsuppress (Overflow_Check);
begin
return Time_Span (Duration (Left) - Duration (Right));
end "-";
function "-" (Right : Time_Span) return Time_Span is
pragma Unsuppress (Overflow_Check);
begin
return Time_Span_Zero - Right;
end "-";
---------
-- "/" --
---------
-- Note that Constraint_Error may be propagated
function "/" (Left, Right : Time_Span) return Integer is
pragma Unsuppress (Overflow_Check);
begin
return Integer (Duration (Left) / Duration (Right));
end "/";
function "/" (Left : Time_Span; Right : Integer) return Time_Span is
pragma Unsuppress (Overflow_Check);
begin
return Time_Span (Duration (Left) / Right);
end "/";
-----------
-- Clock --
-----------
function Clock return Time is
begin
return Time (System.Task_Primitives.Operations.Monotonic_Clock);
end Clock;
------------------
-- Microseconds --
------------------
function Microseconds (US : Integer) return Time_Span is
begin
return Time_Span_Unit * US * 1_000;
end Microseconds;
------------------
-- Milliseconds --
------------------
function Milliseconds (MS : Integer) return Time_Span is
begin
return Time_Span_Unit * MS * 1_000_000;
end Milliseconds;
-------------
-- Minutes --
-------------
function Minutes (M : Integer) return Time_Span is
begin
return Milliseconds (M) * Integer'(60_000);
end Minutes;
-----------------
-- Nanoseconds --
-----------------
function Nanoseconds (NS : Integer) return Time_Span is
begin
return Time_Span_Unit * NS;
end Nanoseconds;
-------------
-- Seconds --
-------------
function Seconds (S : Integer) return Time_Span is
begin
return Milliseconds (S) * Integer'(1000);
end Seconds;
-----------
-- Split --
-----------
procedure Split (T : Time; SC : out Seconds_Count; TS : out Time_Span) is
T_Val : Time;
begin
-- Special-case for Time_First, whose absolute value is anomalous,
-- courtesy of two's complement.
T_Val := (if T = Time_First then abs (Time_Last) else abs (T));
-- Extract the integer part of T, truncating towards zero
SC :=
(if T_Val < 0.5 then 0 else Seconds_Count (Time_Span'(T_Val - 0.5)));
if T < 0.0 then
SC := -SC;
end if;
-- If original time is negative, need to truncate towards negative
-- infinity, to make TS non-negative, as per ARM.
if Time (SC) > T then
SC := SC - 1;
end if;
TS := Time_Span (Duration (T) - Duration (SC));
end Split;
-------------
-- Time_Of --
-------------
function Time_Of (SC : Seconds_Count; TS : Time_Span) return Time is
begin
return Time (SC) + TS;
end Time_Of;
-----------------
-- To_Duration --
-----------------
function To_Duration (TS : Time_Span) return Duration is
begin
return Duration (TS);
end To_Duration;
------------------
-- To_Time_Span --
------------------
function To_Time_Span (D : Duration) return Time_Span is
begin
-- Note regarding AI-00432 requiring range checking on this conversion.
-- In almost all versions of GNAT (and all to which this version of the
-- Ada.Real_Time package apply), the range of Time_Span and Duration are
-- the same, so there is no issue of overflow.
return Time_Span (D);
end To_Time_Span;
begin
-- Ensure that the tasking run time is initialized when using clock and/or
-- delay operations. The initialization routine has the required machinery
-- to prevent multiple calls to Initialize.
System.Tasking.Initialize;
end Ada.Real_Time;
|
