1-- C97201G.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-- CHECK THAT A RENDEZVOUS REQUESTED BY A CONDITIONAL_ENTRY_CALL
26--     IS PERFORMED ONLY IF IMMEDIATELY POSSIBLE.
27
28-- CASE  G:  THE CORRESPONDING ACCEPT_STATEMENT IS CLOSED
29--     AND THIS FACT IS STATICALLY DETERMINABLE.
30
31
32-- RM 4/21/82
33
34
35WITH REPORT; USE REPORT;
36PROCEDURE C97201G IS
37
38     ELSE_BRANCH_TAKEN    :  BOOLEAN  :=  FALSE ;
39     RENDEZVOUS_OCCURRED  :  BOOLEAN  :=  FALSE ;
40     QUEUE_NOT_EMPTY      :  BOOLEAN  :=  FALSE ;
41     X                    :  INTEGER  :=  17 ;
42
43BEGIN
44
45
46     TEST ("C97201G", "CHECK THAT NO RENDEZVOUS REQUESTED BY"      &
47                      " A CONDITIONAL_ENTRY_CALL CAN EVER OCCUR"   &
48                      " IF THE CORRESPONDING ACCEPT_STATEMENT IS"  &
49                      " CLOSED"                                    );
50
51
52     -------------------------------------------------------------------
53
54
55     DECLARE
56
57
58          TASK  T  IS
59               ENTRY  DO_IT_NOW_ORELSE( DID_YOU_DO_IT : IN OUT BOOLEAN);
60               ENTRY  KEEP_ALIVE ;
61          END  T ;
62
63
64          TASK BODY  T  IS
65          BEGIN
66
67               IF  DO_IT_NOW_ORELSE'COUNT /= 0  THEN
68                    QUEUE_NOT_EMPTY := TRUE ;
69               END IF;
70
71
72               SELECT
73                    WHEN  3 = 5  =>
74                         ACCEPT  DO_IT_NOW_ORELSE
75                                      ( DID_YOU_DO_IT : IN OUT BOOLEAN)
76                         DO
77                              DID_YOU_DO_IT := TRUE ;
78                         END;
79               OR
80                         ACCEPT  KEEP_ALIVE ; -- TO PREVENT SELECT_ERROR
81               END SELECT;
82
83
84               IF  DO_IT_NOW_ORELSE'COUNT /= 0  THEN
85                    QUEUE_NOT_EMPTY := TRUE ;
86               END IF;
87
88
89          END  T ;
90
91
92     BEGIN
93
94          COMMENT( "PERMANENTLY CLOSED" );
95
96          SELECT
97               T.DO_IT_NOW_ORELSE( RENDEZVOUS_OCCURRED );
98          ELSE              -- (I.E. CALLER ADOPTS A NO-WAIT POLICY)
99                            --      THEREFORE THIS BRANCH MUST BE CHOSEN
100               ELSE_BRANCH_TAKEN := TRUE ;
101               COMMENT( "ELSE_BRANCH  TAKEN" );
102          END SELECT;
103
104          T.KEEP_ALIVE ;    -- THIS ALSO UPDATES THE NONLOCALS
105
106     END;   -- END OF BLOCK CONTAINING THE ENTRY CALL
107
108
109     -------------------------------------------------------------------
110
111
112     -- BY NOW, THE TASK IS TERMINATED
113
114     IF  RENDEZVOUS_OCCURRED
115     THEN
116          FAILED( "RENDEZVOUS OCCURRED" );
117     END IF;
118
119     IF  QUEUE_NOT_EMPTY
120     THEN
121          FAILED( "ENTRY QUEUE NOT EMPTY" );
122     END IF;
123
124     IF  ELSE_BRANCH_TAKEN  THEN
125          NULL ;
126     ELSE
127          FAILED( "RENDEZVOUS ATTEMPTED?" );
128     END IF;
129
130     RESULT;
131
132
133END  C97201G ;
134