1-- C910003.A
2--
3--                             Grant of Unlimited Rights
4--
5--     Under contracts F33600-87-D-0337, F33600-84-D-0280, MDA903-79-C-0687 and
6--     F08630-91-C-0015, the U.S. Government obtained unlimited rights in the
7--     software and documentation contained herein.  Unlimited rights are
8--     defined in DFAR 252.227-7013(a)(19).  By making this public release,
9--     the Government intends to confer upon all recipients unlimited rights
10--     equal to those held by the Government.  These rights include rights to
11--     use, duplicate, release or disclose the released technical data and
12--     computer software in whole or in part, in any manner and for any purpose
13--     whatsoever, and to have or permit others to do so.
14--
15--                                    DISCLAIMER
16--
17--     ALL MATERIALS OR INFORMATION HEREIN RELEASED, MADE AVAILABLE OR
18--     DISCLOSED ARE AS IS.  THE GOVERNMENT MAKES NO EXPRESS OR IMPLIED
19--     WARRANTY AS TO ANY MATTER WHATSOEVER, INCLUDING THE CONDITIONS OF THE
20--     SOFTWARE, DOCUMENTATION OR OTHER INFORMATION RELEASED, MADE AVAILABLE
21--     OR DISCLOSED, OR THE OWNERSHIP, MERCHANTABILITY, OR FITNESS FOR A
22--     PARTICULAR PURPOSE OF SAID MATERIAL.
23--*
24--
25-- OBJECTIVE:
26--      Check that task discriminants that have an access subtype may be
27--      dereferenced.
28--
29--      Note that discriminants in Ada 83 never can be dereferenced with
30--      selection or indexing, as they cannot have an access type.
31--
32-- TEST DESCRIPTION:
33--      A protected object is defined to create a simple buffer.
34--      Two task types are defined, one to put values into the buffer,
35--      and one to remove them. The tasks are passed a buffer object as
36--      a discriminant with an access subtype. The producer task type includes
37--      a discriminant to determine the values to product. The consumer task
38--      type includes a value to save the results.
39--      Two producer and one consumer tasks are declared, and the results
40--      are checked.
41--
42-- CHANGE HISTORY:
43--      10 Mar 99   RLB    Created test.
44--
45--!
46
47package C910003_Pack is
48
49    type Item_Type is range 1 .. 100; -- In a real application, this probably
50                                      -- would be a record type.
51
52    type Item_Array is array (Positive range <>) of Item_Type;
53
54    protected type Buffer is
55       entry Put (Item  : in Item_Type);
56       entry Get (Item  : out Item_Type);
57       function TC_Items_Buffered return Item_Array;
58    private
59       Saved_Item : Item_Type;
60       Empty : Boolean := True;
61       TC_Items : Item_Array (1 .. 10);
62       TC_Last  : Natural := 0;
63    end Buffer;
64
65    type Buffer_Access_Type is access Buffer;
66
67    PRODUCE_COUNT : constant := 2; -- Number of items to produce.
68
69    task type Producer (Buffer_Access : Buffer_Access_Type;
70                        Start_At : Item_Type);
71        -- Produces PRODUCE_COUNT items. Starts when activated.
72
73    type TC_Item_Array_Access_Type is access Item_Array (1 .. PRODUCE_COUNT*2);
74
75    task type Consumer (Buffer_Access : Buffer_Access_Type;
76                        Results : TC_Item_Array_Access_Type) is
77        -- Stores PRODUCE_COUNT*2 items consumed in Results. Starts when
78        -- activated.
79        entry Wait_until_Done;
80    end Consumer;
81
82end C910003_Pack;
83
84
85with Report;
86package body C910003_Pack is
87
88    protected body Buffer is
89       entry Put (Item  : in Item_Type) when Empty is
90       begin
91           Empty := False;
92           Saved_Item := Item;
93           TC_Last := TC_Last + 1;
94           TC_Items(TC_Last) := Item;
95       end Put;
96
97       entry Get (Item  : out Item_Type) when not Empty is
98       begin
99           Empty := True;
100           Item := Saved_Item;
101       end Get;
102
103       function TC_Items_Buffered return Item_Array is
104       begin
105           return TC_Items(1..TC_Last);
106       end TC_Items_Buffered;
107
108    end Buffer;
109
110
111    task body Producer is
112        -- Produces PRODUCE_COUNT items. Starts when activated.
113    begin
114        for I in 1 .. Report.Ident_Int(PRODUCE_COUNT) loop
115           Buffer_Access.Put (Start_At + (Item_Type(I)-1)*2);
116        end loop;
117    end Producer;
118
119
120    task body Consumer is
121        -- Stores PRODUCE_COUNT*2 items consumed in Results. Starts when
122        -- activated.
123    begin
124        for I in 1 .. Report.Ident_Int(PRODUCE_COUNT*2) loop
125            Buffer_Access.Get (Results (I));
126            -- Buffer_Access and Results are both dereferenced.
127        end loop;
128
129        -- Check the results (and function call with a prefix dereference).
130        if Results.all(Report.Ident_Int(1)) /= Buffer_Access.all.TC_Items_Buffered(Report.Ident_Int(1)) then
131           Report.Failed ("First item mismatch");
132        end if;
133        if Results(Report.Ident_Int(2)) /= Buffer_Access.TC_Items_Buffered(Report.Ident_Int(2)) then
134           Report.Failed ("Second item mismatch");
135        end if;
136        accept Wait_until_Done; -- Tell main that we're done.
137    end Consumer;
138
139end C910003_Pack;
140
141
142with Report;
143with C910003_Pack;
144
145procedure C910003 is
146
147begin -- C910003
148
149   Report.Test ("C910003", "Check that tasks discriminants of access types can be dereferenced");
150
151
152   declare     -- encapsulate the test
153
154      Buffer_Access : C910003_Pack.Buffer_Access_Type :=
155         new C910003_Pack.Buffer;
156
157      TC_Results : C910003_Pack.TC_Item_Array_Access_Type :=
158         new C910003_Pack.Item_Array (1 .. C910003_Pack.PRODUCE_COUNT*2);
159
160      Producer_1 : C910003_Pack.Producer (Buffer_Access, 12);
161      Producer_2 : C910003_Pack.Producer (Buffer_Access, 23);
162
163      Consumer : C910003_Pack.Consumer (Buffer_Access, TC_Results);
164
165      use type C910003_Pack.Item_Array; -- For /=.
166
167   begin
168      Consumer.Wait_until_Done;
169      if TC_Results.all /= Buffer_Access.TC_Items_Buffered then
170           Report.Failed ("Different items buffered than returned - Main");
171      end if;
172      if (TC_Results.all /= (12, 14, 23, 25) and
173          TC_Results.all /= (12, 23, 14, 25) and
174          TC_Results.all /= (12, 23, 25, 14) and
175          TC_Results.all /= (23, 12, 14, 25) and
176          TC_Results.all /= (23, 12, 25, 14) and
177          TC_Results.all /= (23, 25, 12, 14)) then
178          -- Above are the only legal results.
179           Report.Failed ("Wrong results");
180      end if;
181   end;     -- encapsulation
182
183   Report.Result;
184
185end C910003;
186