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author kono
date Fri, 27 Oct 2017 22:46:09 +0900
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1 -- C974002.A
2 --
3 -- Grant of Unlimited Rights
4 --
5 -- Under contracts F33600-87-D-0337, F33600-84-D-0280, MDA903-79-C-0687,
6 -- F08630-91-C-0015, and DCA100-97-D-0025, the U.S. Government obtained
7 -- unlimited rights in the software and documentation contained herein.
8 -- Unlimited rights are defined in DFAR 252.227-7013(a)(19). By making
9 -- this public release, the Government intends to confer upon all
10 -- recipients unlimited rights equal to those held by the Government.
11 -- These rights include rights to use, duplicate, release or disclose the
12 -- released technical data and computer software in whole or in part, in
13 -- any manner and for any purpose whatsoever, and to have or permit others
14 -- to do so.
15 --
16 -- DISCLAIMER
17 --
18 -- ALL MATERIALS OR INFORMATION HEREIN RELEASED, MADE AVAILABLE OR
19 -- DISCLOSED ARE AS IS. THE GOVERNMENT MAKES NO EXPRESS OR IMPLIED
20 -- WARRANTY AS TO ANY MATTER WHATSOEVER, INCLUDING THE CONDITIONS OF THE
21 -- SOFTWARE, DOCUMENTATION OR OTHER INFORMATION RELEASED, MADE AVAILABLE
22 -- OR DISCLOSED, OR THE OWNERSHIP, MERCHANTABILITY, OR FITNESS FOR A
23 -- PARTICULAR PURPOSE OF SAID MATERIAL.
24 --*
25 --
26 -- OBJECTIVE:
27 -- Check that the sequence of statements of the triggering alternative
28 -- of an asynchronous select statement is executed if the triggering
29 -- statement is a delay_until statement, and the specified time has
30 -- already passed. Check that the abortable part is not executed after
31 -- the sequence of statements of the triggering alternative is left.
32 --
33 -- Check that the sequence of statements of the triggering alternative
34 -- of an asynchronous select statement is not executed if the abortable
35 -- part completes before the triggering statement, and the triggering
36 -- statement is a delay_until statement.
37 --
38 -- TEST DESCRIPTION:
39 -- Declare a task with an accept statement containing an asynchronous
40 -- select with a delay_until triggering statement. Parameterize
41 -- the accept statement with the time to be used in the delay. Simulate
42 -- a quick calculation by declaring a procedure which sets a Boolean
43 -- flag. Call this procedure in the abortable part.
44 --
45 -- Make two calls to the task entry: (1) with a time that has already
46 -- expired, and (2) with a time that will not expire before the quick
47 -- calculation completes.
48 --
49 -- For (1), the sequence of statements following the triggering statement
50 -- is executed, and the abortable part never starts.
51 --
52 -- For (2), the abortable part completes before the triggering statement,
53 -- the delay is canceled, and the sequence of statements following the
54 -- triggering statement never starts.
55 --
56 --
57 -- CHANGE HISTORY:
58 -- 06 Dec 94 SAIC ACVC 2.0
59 -- 26 Nov 95 SAIC Bug fix for ACVC 2.0.1.
60 --
61 --!
62
63 with Report;
64 with Ada.Calendar;
65 with ImpDef;
66 procedure C974002 is
67
68 function "-" (Left: Ada.Calendar.Time; Right: Duration )
69 return Ada.Calendar.Time renames Ada.Calendar."-";
70 function "+" (Left: Ada.Calendar.Time; Right: Duration )
71 return Ada.Calendar.Time renames Ada.Calendar."+";
72
73 Abortable_Part_Executed : Boolean;
74 Triggering_Alternative_Executed : Boolean;
75
76
77 --========================================================--
78
79
80 procedure Quick_Calculation is
81 begin
82 if Report.Equal (1, 1) then
83 Abortable_Part_Executed := True;
84 end if;
85 end Quick_Calculation;
86
87
88 --========================================================--
89
90
91 task type Timed_Calculation_Task is
92 entry Calculation (Time_Out : in Ada.Calendar.Time);
93 end Timed_Calculation_Task;
94
95
96 task body Timed_Calculation_Task is
97 begin
98 loop
99 select
100 accept Calculation (Time_Out : in Ada.Calendar.Time) do
101
102 -- --
103 -- Asynchronous select is tested here --
104 -- --
105
106 select
107 delay until Time_Out; -- Triggering
108 -- statement.
109
110 Triggering_Alternative_Executed := True; -- Triggering
111 -- alternative.
112 then abort
113 Quick_Calculation; -- Abortable part.
114 end select;
115 end Calculation;
116 or
117 terminate;
118 end select;
119 end loop;
120 exception
121 when others =>
122 Report.Failed ("Unexpected exception in Timed_Calculation_Task");
123 end Timed_Calculation_Task;
124
125
126 --========================================================--
127
128
129 Start_Time : constant Ada.Calendar.Time :=
130 Ada.Calendar.Time_of (1901,1,1);
131 Minute : constant Duration := 60.0;
132
133
134 --========================================================--
135
136
137 begin -- Main program.
138
139 Report.Test ("C974002", "Asynchronous Select with Delay_Until");
140
141 -- take care of implementations that start the clock at 1/1/01
142 delay ImpDef.Delay_For_Time_Past;
143
144
145 Abortable_Part_Executed := False;
146 Triggering_Alternative_Executed := False;
147
148 NO_DELAY_SUBTEST:
149
150 declare
151 -- Set Expiry to a time which has already passed
152 Expiry : constant Ada.Calendar.Time := Start_Time;
153 Timed : Timed_Calculation_Task;
154 begin
155
156 -- Expiry is the time to be specified in the delay_until statement
157 -- of the asynchronous select. Since it has already passed, the
158 -- abortable part should not execute, and the sequence of statements
159 -- of the triggering alternative should be executed.
160
161 Timed.Calculation (Time_Out => Expiry); -- Asynchronous select
162 -- inside accept block.
163 if Abortable_Part_Executed then
164 Report.Failed ("No delay: Abortable part was executed");
165 end if;
166
167 if not Triggering_Alternative_Executed then
168 Report.Failed ("No delay: triggering alternative sequence " &
169 "of statements was not executed");
170 end if;
171 end No_Delay_Subtest;
172
173
174 Abortable_Part_Executed := False;
175 Triggering_Alternative_Executed := False;
176
177 LONG_DELAY_SUBTEST:
178
179 declare
180
181 -- Quick_Calculation should finish before expiry.
182 Expiry : constant Ada.Calendar.Time :=
183 Ada.Calendar.Clock + Minute;
184 Timed : Timed_Calculation_Task;
185
186 begin
187
188 -- Expiry is the time to be specified in the delay_until statement
189 -- of the asynchronous select. It should not pass before the abortable
190 -- part completes, at which time control should return to the caller;
191 -- the sequence of statements of the triggering alternative should
192 -- not be executed.
193
194 Timed.Calculation (Time_Out => Expiry); -- Asynchronous select.
195
196 if not Abortable_Part_Executed then
197 Report.Failed ("Long delay: Abortable part was not executed");
198 end if;
199
200 if Triggering_Alternative_Executed then
201 Report.Failed ("Long delay: triggering alternative sequence " &
202 "of statements was executed");
203 end if;
204 end Long_Delay_Subtest;
205
206
207 Report.Result;
208
209 end C974002;