1-- C97116A.ADA
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-- OBJECTIVE:
26--     CHECK THAT THE GUARD CONDITIONS IN A SELECTIVE WAIT STATEMENT
27--     ARE NOT RE-EVALUATED DURING THE WAIT.
28
29-- HISTORY:
30--     WRG 7/10/86  CREATED ORIGINAL TEST.
31--     RJW 5/15/90  REMOVED SHARED VARIABLES.
32
33with Impdef;
34WITH REPORT; USE REPORT;
35PROCEDURE C97116A IS
36
37     GUARD_EVALUATIONS : NATURAL := 0;
38
39     FUNCTION GUARD RETURN BOOLEAN IS
40     BEGIN
41          GUARD_EVALUATIONS := GUARD_EVALUATIONS + 1;
42          RETURN FALSE;
43     END GUARD;
44
45     FUNCTION SO_LONG RETURN DURATION IS
46     BEGIN
47          RETURN 20.0;
48     END SO_LONG;
49
50BEGIN
51
52     TEST ("C97116A", "CHECK THAT THE GUARD CONDITIONS IN A " &
53                      "SELECTIVE WAIT STATEMENT ARE NOT RE-EVALUATED " &
54                      "DURING THE WAIT");
55
56     DECLARE
57
58          TASK T IS
59               ENTRY E;
60          END T;
61
62          TASK BODY T IS
63          BEGIN
64               SELECT
65                    ACCEPT E;
66                    FAILED ("ACCEPTED NONEXISTENT CALL TO E");
67               OR WHEN GUARD     =>
68                    DELAY 0.0;
69                    FAILED ("EXECUTED ALTERNATIVE CLOSED BY FALSE " &
70                            "GUARD FUNCTION" );
71               OR
72                    DELAY SO_LONG * Impdef.One_Second;
73               END SELECT;
74          EXCEPTION
75               WHEN OTHERS =>
76                    FAILED ("EXCEPTION RAISED");
77          END T;
78
79          TASK GET_CPU;
80
81          TASK BODY GET_CPU IS
82          BEGIN
83               WHILE NOT T'TERMINATED LOOP
84                    DELAY 1.0 * Impdef.One_Second;
85               END LOOP;
86
87          END GET_CPU;
88
89     BEGIN
90
91          NULL;
92
93     END;
94
95     IF GUARD_EVALUATIONS /= 1 THEN
96          FAILED ("GUARD EVALUATED" &
97                  NATURAL'IMAGE(GUARD_EVALUATIONS) & " TIMES");
98     END IF;
99
100     RESULT;
101
102END C97116A;
103