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
|
-- C97201G.ADA
-- Grant of Unlimited Rights
--
-- Under contracts F33600-87-D-0337, F33600-84-D-0280, MDA903-79-C-0687,
-- F08630-91-C-0015, and DCA100-97-D-0025, the U.S. Government obtained
-- unlimited rights in the software and documentation contained herein.
-- Unlimited rights are defined in DFAR 252.227-7013(a)(19). By making
-- this public release, the Government intends to confer upon all
-- recipients unlimited rights equal to those held by the Government.
-- These rights include rights to use, duplicate, release or disclose the
-- released technical data and computer software in whole or in part, in
-- any manner and for any purpose whatsoever, and to have or permit others
-- to do so.
--
-- DISCLAIMER
--
-- ALL MATERIALS OR INFORMATION HEREIN RELEASED, MADE AVAILABLE OR
-- DISCLOSED ARE AS IS. THE GOVERNMENT MAKES NO EXPRESS OR IMPLIED
-- WARRANTY AS TO ANY MATTER WHATSOEVER, INCLUDING THE CONDITIONS OF THE
-- SOFTWARE, DOCUMENTATION OR OTHER INFORMATION RELEASED, MADE AVAILABLE
-- OR DISCLOSED, OR THE OWNERSHIP, MERCHANTABILITY, OR FITNESS FOR A
-- PARTICULAR PURPOSE OF SAID MATERIAL.
--*
-- CHECK THAT A RENDEZVOUS REQUESTED BY A CONDITIONAL_ENTRY_CALL
-- IS PERFORMED ONLY IF IMMEDIATELY POSSIBLE.
-- CASE G: THE CORRESPONDING ACCEPT_STATEMENT IS CLOSED
-- AND THIS FACT IS STATICALLY DETERMINABLE.
-- RM 4/21/82
WITH REPORT; USE REPORT;
PROCEDURE C97201G IS
ELSE_BRANCH_TAKEN : BOOLEAN := FALSE ;
RENDEZVOUS_OCCURRED : BOOLEAN := FALSE ;
QUEUE_NOT_EMPTY : BOOLEAN := FALSE ;
X : INTEGER := 17 ;
BEGIN
TEST ("C97201G", "CHECK THAT NO RENDEZVOUS REQUESTED BY" &
" A CONDITIONAL_ENTRY_CALL CAN EVER OCCUR" &
" IF THE CORRESPONDING ACCEPT_STATEMENT IS" &
" CLOSED" );
-------------------------------------------------------------------
DECLARE
TASK T IS
ENTRY DO_IT_NOW_ORELSE( DID_YOU_DO_IT : IN OUT BOOLEAN);
ENTRY KEEP_ALIVE ;
END T ;
TASK BODY T IS
BEGIN
IF DO_IT_NOW_ORELSE'COUNT /= 0 THEN
QUEUE_NOT_EMPTY := TRUE ;
END IF;
SELECT
WHEN 3 = 5 =>
ACCEPT DO_IT_NOW_ORELSE
( DID_YOU_DO_IT : IN OUT BOOLEAN)
DO
DID_YOU_DO_IT := TRUE ;
END;
OR
ACCEPT KEEP_ALIVE ; -- TO PREVENT SELECT_ERROR
END SELECT;
IF DO_IT_NOW_ORELSE'COUNT /= 0 THEN
QUEUE_NOT_EMPTY := TRUE ;
END IF;
END T ;
BEGIN
COMMENT( "PERMANENTLY CLOSED" );
SELECT
T.DO_IT_NOW_ORELSE( RENDEZVOUS_OCCURRED );
ELSE -- (I.E. CALLER ADOPTS A NO-WAIT POLICY)
-- THEREFORE THIS BRANCH MUST BE CHOSEN
ELSE_BRANCH_TAKEN := TRUE ;
COMMENT( "ELSE_BRANCH TAKEN" );
END SELECT;
T.KEEP_ALIVE ; -- THIS ALSO UPDATES THE NONLOCALS
END; -- END OF BLOCK CONTAINING THE ENTRY CALL
-------------------------------------------------------------------
-- BY NOW, THE TASK IS TERMINATED
IF RENDEZVOUS_OCCURRED
THEN
FAILED( "RENDEZVOUS OCCURRED" );
END IF;
IF QUEUE_NOT_EMPTY
THEN
FAILED( "ENTRY QUEUE NOT EMPTY" );
END IF;
IF ELSE_BRANCH_TAKEN THEN
NULL ;
ELSE
FAILED( "RENDEZVOUS ATTEMPTED?" );
END IF;
RESULT;
END C97201G ;
|
