1-- C97201E.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  E:  THE BODY OF THE TASK CONTAINING THE CALLED ENTRY
29--     DOES NOT CONTAIN AN ACCEPT_STATEMENT FOR THAT ENTRY  -
30--     AND THIS FACT CAN NOT BE DETERMINED STATICALLY.
31--     (THE ENTRY BELONGS TO AN ENTRY FAMILY; SOME FAMILY MEMBERS
32--     ARE "ACCEPTABLE", BUT NOT THE CALLED ONE.)
33
34
35-- RM 4/13/82
36
37
38WITH REPORT; USE REPORT;
39PROCEDURE C97201E IS
40
41     ELSE_BRANCH_TAKEN    :  BOOLEAN  :=  FALSE ;
42
43BEGIN
44
45
46     TEST ("C97201E", "CHECK THAT NO RENDEZVOUS REQUESTED BY"      &
47                      " A CONDITIONAL_ENTRY_CALL CAN EVER OCCUR"   &
48                      " IN THE ABSENCE OF A CORRESPONDING "        &
49                      " ACCEPT_STATEMENT "                         );
50
51
52     DECLARE
53
54          SUBTYPE  SHORT  IS  INTEGER RANGE 10..20 ;
55
56          KEEP_ALIVE  :  INTEGER  := 15 ;
57
58          TASK  T  IS
59               ENTRY  DO_IT_NOW_ORELSE ( SHORT ) ;
60          END  T ;
61
62
63          TASK BODY  T  IS
64          BEGIN
65
66               -- NO ACCEPT_STATEMENT FOR THE ENTRY_CALL BEING TESTED
67               ACCEPT  DO_IT_NOW_ORELSE ( IDENT_INT(15) );
68
69                                     -- THIS ALSO PREVENTS THIS SERVER
70                                     --     TASK FROM TERMINATING IF
71                                     --     UPON ACTIVATION
72                                     --     IT GETS TO RUN
73                                     --     AHEAD OF THE CALLER (WHICH
74                                     --     WOULD LEAD TO A SUBSEQUENT
75                                     --     TASKING_ERROR AT THE TIME OF
76                                     --     THE NO-WAIT CALL).
77
78          END ;
79
80
81     BEGIN
82
83          SELECT
84               T.DO_IT_NOW_ORELSE (10) ;  -- ACCEPT_STATEMENT HAS  15
85          ELSE              -- (I.E. CALLER ADOPTS A NO-WAIT POLICY)
86                            --      THEREFORE THIS BRANCH MUST BE CHOSEN
87               ELSE_BRANCH_TAKEN := TRUE ;
88               COMMENT( "ELSE_BRANCH  TAKEN" );
89          END SELECT;
90
91          T.DO_IT_NOW_ORELSE(KEEP_ALIVE) ;-- THIS ALSO UPDATES NONLOCALS
92
93     END;   -- END OF BLOCK CONTAINING THE ENTRY CALL
94
95
96     -- BY NOW, THE TASK IS TERMINATED
97
98     IF  ELSE_BRANCH_TAKEN  THEN
99          NULL ;
100     ELSE
101          FAILED( "RENDEZVOUS ATTEMPTED?" );
102     END IF;
103
104     RESULT;
105
106
107END  C97201E ;
108