1-- C97201D.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  D:  THE BODY OF THE TASK CONTAINING THE CALLED ENTRY
29--     DOES NOT CONTAIN AN ACCEPT_STATEMENT FOR THAT ENTRY  -
30--     AND THIS FACT IS DETERMINED STATICALLY.
31
32
33-- RM 4/12/82
34
35
36WITH REPORT; USE REPORT;
37PROCEDURE C97201D IS
38
39     ELSE_BRANCH_TAKEN    :  BOOLEAN  :=  FALSE ;
40
41BEGIN
42
43
44     TEST ("C97201D", "CHECK THAT NO RENDEZVOUS REQUESTED BY"      &
45                      " A CONDITIONAL_ENTRY_CALL CAN EVER OCCUR"   &
46                      " IN THE ABSENCE OF A CORRESPONDING "        &
47                      " ACCEPT_STATEMENT "                         );
48
49
50     DECLARE
51
52
53          TASK  T  IS
54               ENTRY  DO_IT_NOW_ORELSE ;
55               ENTRY  KEEP_ALIVE ;
56          END  T ;
57
58
59          TASK BODY  T  IS
60          BEGIN
61
62               -- NO ACCEPT_STATEMENT FOR THE ENTRY_CALL BEING TESTED
63
64               ACCEPT  KEEP_ALIVE ;  -- TO PREVENT THIS SERVER TASK FROM
65                                     --     TERMINATING IF
66                                     --     UPON ACTIVATION
67                                     --     IT GETS TO RUN
68                                     --     AHEAD OF THE CALLER (WHICH
69                                     --     WOULD LEAD TO A SUBSEQUENT
70                                     --     TASKING_ERROR AT THE TIME OF
71                                     --     THE NO-WAIT CALL).
72
73          END ;
74
75
76     BEGIN
77
78          SELECT
79               T.DO_IT_NOW_ORELSE ;
80          ELSE              -- (I.E. CALLER ADOPTS A NO-WAIT POLICY)
81                            --      THEREFORE THIS BRANCH MUST BE CHOSEN
82               ELSE_BRANCH_TAKEN := TRUE ;
83               COMMENT( "ELSE_BRANCH  TAKEN" );
84          END SELECT;
85
86          T.KEEP_ALIVE ;    -- THIS ALSO UPDATES THE NONLOCALS
87
88     END;   -- END OF BLOCK CONTAINING THE ENTRY CALL
89
90
91     -- BY NOW, THE TASK IS TERMINATED
92
93     IF  ELSE_BRANCH_TAKEN  THEN
94          NULL ;
95     ELSE
96          FAILED( "RENDEZVOUS ATTEMPTED?" );
97     END IF;
98
99     RESULT;
100
101
102END  C97201D ;
103