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comparison gcc/testsuite/ada/acats/tests/c9/c97201x.ada @ 111:04ced10e8804

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gcc 7
author kono
date Fri, 27 Oct 2017 22:46:09 +0900
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68:561a7518be6b 111:04ced10e8804
1 -- C97201X.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 NO RENDEZVOUS CAN EVER OCCUR IF BOTH PARTNERS REFUSE TO
26 -- WAIT (THAT IS, IF THE ENTRY CALL IS ISSUED BY A
27 -- "CONDITIONAL_ENTRY_CALL" AND THUS FOLLOWS A NO-WAIT POLICY
28 -- (DEMANDING UNCONDITIONALLY THAT "YOU DO IT N O W , OR ELSE"),
29 -- WHILE THE CALLEE IS ALSO COMMITTED TO A NO-WAIT POLICY,
30 -- BY VIRTUE OF A SELECTIVE_WAIT STATEMENT OF THE THIRD KIND
31 -- (WITH AN "ELSE" PART) IN WHICH THE CORRESPONDING ACCEPT_STATEMENT
32 -- IS EMBEDDED).
33 -- ("CLOSE ENCOUNTERS OF THE THIRD KIND" -- ARE THEY POSSIBLE?)
34
35
36 -- THE SEMANTICS OF THIS ENTRY CALL REQUIRES THAT THE CALLING TASK
37 -- N O T ENTER ITSELF ON ANY QUEUE BUT RATHER ATTEMPT AN IMMEDIATE
38 -- RENDEZVOUS WHICH IS TO TAKE PLACE IF AND ONLY IF THE CALLED TASK
39 -- HAS REACHED A POINT WHERE IT IS READY TO ACCEPT THE CALL (I.E.
40 -- IT IS EITHER WAITING AT AN ACCEPT STATEMENT FOR THE CORRESPONDING
41 -- ENTRY OR IT IS WAITING AT A SELECTIVE_WAIT STATEMENT WITH AN OPEN
42 -- ALTERNATIVE STARTING WITH SUCH AN ACCEPT STATEMENT). IT ALSO
43 -- REQUIRES THAT THE ENTRY CALL BE CANCELLED IF THE CALLED TASK
44 -- IS NOT AT SUCH A POINT. ON THE OTHER HAND, THE SEMANTICS OF THE
45 -- SELECTIVE_WAIT STATEMENT WITH AN 'ELSE' PART SPECIFIES THAT
46 -- THE 'ELSE' PART MUST BE SELECTED IF NO 'ACCEPT' ALTERNATIVE
47 -- CAN BE IMMEDIATELY SELECTED, AND THAT SUCH AN ALTERNATIVE
48 -- IS DEEMED TO BE IMMEDIATELY SELECTABLE ("SELECTION OF ONE SUCH
49 -- ALTERNATIVE OCCURS IMMEDIATELY"), AND A CORRESPONDING RENDEZVOUS
50 -- POSSIBLE, IF AND ONLY IF THERE IS A CORRESPONDING ENTRY CALL
51 -- W A I T I N G TO BE ACCCEPTED. A "CONDITIONAL ENTRY CALL"
52 -- NEVER WAITS, AND IS NEVER ENTERED IN WAIT QUEUES; IT TAKES
53 -- THE 'ELSE' PART INSTEAD.
54
55
56 -- NOTE: IF THIS TEST PROGRAM HANGS UP, THE COMPILER WILL BE DEEMED
57 -- TO HAVE FAILED.
58
59
60 -- RM 3/19/82
61
62
63 WITH REPORT; USE REPORT;
64 PROCEDURE C97201X IS
65
66 RENDEZVOUS_OCCURRED : BOOLEAN := FALSE ;
67
68 CALLER_TAKES_WRONG_BRANCH : BOOLEAN := TRUE ;
69 SERVER_TAKES_WRONG_BRANCH : BOOLEAN := TRUE ;
70 QUEUE_NOT_EMPTY : BOOLEAN := FALSE ;
71
72 BEGIN
73
74
75 TEST ("C97201X", "CHECK THAT NO RENDEZVOUS CAN EVER OCCUR IF" &
76 " BOTH PARTNERS REFUSE TO WAIT" );
77
78
79 DECLARE
80
81
82 TASK T IS
83 ENTRY SYNCHRONIZE ;
84 ENTRY DO_IT_NOW_ORELSE( DID_YOU_DO_IT : IN OUT BOOLEAN);
85 ENTRY KEEP_ALIVE ;
86 END T ;
87
88
89 TASK BODY T IS
90 BEGIN
91
92
93 ACCEPT SYNCHRONIZE ;
94
95
96 IF DO_IT_NOW_ORELSE'COUNT /= 0 THEN
97 QUEUE_NOT_EMPTY := TRUE ;
98 END IF;
99
100
101 SELECT
102 ACCEPT DO_IT_NOW_ORELSE
103 ( DID_YOU_DO_IT : IN OUT BOOLEAN )
104 DO
105 DID_YOU_DO_IT := TRUE ;
106 END ;
107 ELSE -- (I.E. TASK ADOPTS NO-WAIT POLICY)
108 -- 'ELSE' BRANCH MUST THEREFORE BE CHOSEN
109 SERVER_TAKES_WRONG_BRANCH := FALSE ;
110 END SELECT;
111
112
113 IF DO_IT_NOW_ORELSE'COUNT /= 0 THEN
114 QUEUE_NOT_EMPTY := TRUE ;
115 END IF;
116
117
118 ACCEPT KEEP_ALIVE ; -- TO PREVENT THIS SERVER TASK FROM
119 -- TERMINATING IF IT GETS TO
120 -- THE NO-WAIT MEETING-PLACE
121 -- AHEAD OF THE CALLER (WHICH
122 -- WOULD LEAD TO A SUBSEQUENT
123 -- TASKING_ERROR AT THE TIME OF
124 -- THE NO-WAIT CALL).
125
126
127 END T ;
128
129
130 BEGIN
131
132
133 T.SYNCHRONIZE ; -- TO MINIMIZE THE N E E D TO WAIT
134
135
136 SELECT
137 T.DO_IT_NOW_ORELSE ( RENDEZVOUS_OCCURRED );
138 ELSE -- (I.E. CALLER TOO ADOPTS A NO-WAIT POLICY)
139 -- MUST THEREFORE CHOOSE THIS BRANCH
140 CALLER_TAKES_WRONG_BRANCH := FALSE ;
141 END SELECT;
142
143
144 T.KEEP_ALIVE ; -- THIS ALSO UPDATES THE NONLOCALS
145
146
147 END; -- END OF BLOCK CONTAINING THE NO-WAIT ENTRY CALL
148
149
150 IF RENDEZVOUS_OCCURRED
151 THEN
152 FAILED( "RENDEZVOUS OCCURRED" );
153 END IF;
154
155 IF CALLER_TAKES_WRONG_BRANCH OR
156 SERVER_TAKES_WRONG_BRANCH
157 THEN
158 FAILED( "WRONG BRANCH TAKEN" );
159 END IF;
160
161 IF QUEUE_NOT_EMPTY
162 THEN
163 FAILED( "ENTRY QUEUE NOT EMPTY" );
164 END IF;
165
166
167 RESULT;
168
169
170 END C97201X ;