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1 294 jeremybenn
-- C954012.A
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
--
26
-- OBJECTIVE:
27
--     Check a requeue within an accept body to another entry in the same task
28
--     Specifically, check a call with parameters and a requeue with abort.
29
--
30
-- TEST DESCRIPTION:
31
--      One transaction is sent through to check the paths. After
32
--      processing this the Credit task sets the "overloaded" indicator.  Once
33
--      this indicator is set the Distributor queues low priority transactions
34
--      on a Wait_for_Underload queue in the same task using a requeue.  The
35
--      Distributor still delivers high priority transactions.  After two high
36
--      priority transactions have been processed by the Credit task it clears
37
--      the overload condition.  The low priority transactions should now be
38
--      delivered.
39
--
40
--      This series of tests uses a simulation of a transaction driven
41
--      processing system.  Line Drivers accept input from an external source
42
--      and build them into transaction records.  These records are then
43
--      encapsulated in message tasks which remain extant for the life of the
44
--      transaction in the system.  The message tasks put themselves on the
45
--      input queue of a Distributor which, from information in the
46
--      transaction and/or system load conditions forwards them to other
47
--      operating tasks. These in turn might forward the transactions to yet
48
--      other tasks for further action.  The routing is, in real life, dynamic
49
--      and unpredictable at the time of message generation.  All rerouting in
50
--      this  model is done by means of requeues.
51
--
52
--
53
-- CHANGE HISTORY:
54
--      06 Dec 94   SAIC    ACVC 2.0
55
--      25 Nov 95   SAIC    Fixed shared global variable problem for
56
--                          ACVC 2.0.1
57
--      14 Mar 03   RLB     Fixed a race condition and an incorrect termination
58
--                          condition in the test.
59
--!
60
 
61
with Report;
62
with ImpDef;
63
with Ada.Calendar;
64
 
65
procedure C954012 is
66
 
67
   function "=" (X,Y: Ada.Calendar.Time) return Boolean
68
                                                   renames Ada.Calendar."=";
69
 
70
   -- Arbitrary test values
71
   Credit_Return : constant := 1;
72
   Debit_Return  : constant := 2;
73
 
74
 
75
   -- This is used as an "initializing" time for the messages as they are
76
   -- created.  As they pass through the Distributor they get a time_stamp
77
   -- of the current time. An arbitrary base time is chosen.
78
   --    TC: this fact is used, incidentally, to check that the messages have,
79
   --    indeed, passed through the Distributor as expected.
80
   --
81
   Base_Time : Ada.Calendar.Time := Ada.Calendar.Time_of(1959,3,9);
82
 
83
 
84
   -- Mechanism to count the number of Credit Message tasks completed
85
   protected TC_Tasks_Completed is
86
      procedure Increment;
87
      function  Count return integer;
88
   private
89
      Number_Complete : integer := 0;
90
   end TC_Tasks_Completed;
91
 
92
   protected type Shared_Boolean (Initial_Value : Boolean := False) is
93
      procedure Set_True;
94
      procedure Set_False;
95
      function  Value return Boolean;
96
   private
97
      Current_Value : Boolean := Initial_Value;
98
   end Shared_Boolean;
99
 
100
   protected body Shared_Boolean is
101
      procedure Set_True is
102
      begin
103
         Current_Value := True;
104
      end Set_True;
105
 
106
      procedure Set_False is
107
      begin
108
         Current_Value := False;
109
      end Set_False;
110
 
111
      function Value return Boolean is
112
      begin
113
         return Current_Value;
114
      end Value;
115
   end Shared_Boolean;
116
 
117
   TC_Debit_Message_Complete    : Shared_Boolean (False);
118
   -- Handshaking mechanism between the Line Driver and the Credit task
119
   TC_First_Message_Has_Arrived : Shared_Boolean (False);
120
   Credit_Overloaded : Shared_Boolean (False);
121
 
122
   TC_Credit_Messages_Expected  : constant integer := 5;
123
 
124
   type Transaction_Code is (Credit, Debit);
125
   type Transaction_Priority is (High, Low);
126
 
127
   type Transaction_Record;
128
   type acc_Transaction_Record is access Transaction_Record;
129
   type Transaction_Record is
130
      record
131
         ID               : integer := 0;
132
         Code             : Transaction_Code := Debit;
133
         Priority         : Transaction_Priority := High;
134
         Account_Number   : integer := 0;
135
         Stock_Number     : integer := 0;
136
         Quantity         : integer := 0;
137
         Return_Value     : integer := 0;
138
         Message_Count    : integer := 0;          -- for test
139
         Time_Stamp       : Ada.Calendar.Time := Base_Time;
140
      end record;
141
 
142
 
143
   task type Message_Task is
144
      entry Accept_Transaction (In_Transaction : acc_Transaction_Record);
145
   end Message_Task;
146
   type acc_Message_Task is access Message_Task;
147
 
148
   task Line_Driver is
149
      entry Start;
150
   end Line_Driver;
151
 
152
   task Distributor is
153
      entry Input (Transaction : acc_Transaction_Record);
154
      entry Wait_for_Underload (Transaction : acc_Transaction_Record);
155
      entry TC_Credit_OK;
156
   end Distributor;
157
 
158
   task Credit_Computation is
159
      entry Input(Transaction : acc_Transaction_Record);
160
   end Credit_Computation;
161
 
162
   task Debit_Computation is
163
      entry Input(Transaction : acc_Transaction_Record);
164
   end Debit_Computation;
165
 
166
 
167
   -- Mechanism to count the number of Message tasks completed (Credit)
168
   protected body TC_Tasks_Completed is
169
      procedure Increment is
170
      begin
171
         Number_Complete := Number_Complete + 1;
172
      end Increment;
173
 
174
      function Count return integer is
175
      begin
176
         return Number_Complete;
177
      end Count;
178
   end TC_Tasks_Completed;
179
 
180
 
181
   -- Assemble messages received from an external source
182
   --   Creates a message task for each. The message tasks remain extant
183
   --   for the life of the messages in the system.
184
   --      The Line Driver task would normally be designed to loop continuously
185
   --      creating the messages as input is received.  Simulate this
186
   --      but limit it to the required number of dummy messages needed for
187
   --      this test and allow it to terminate at that point.  Artificially
188
   --      alternate High and Low priority Credit transactions for this test.
189
   --
190
   task body Line_Driver is
191
      Current_ID       : integer := 1;
192
      Current_Priority : Transaction_Priority := High;
193
 
194
      -- Artificial: number of messages required for this test
195
      type TC_Trans_Range is range 1..6;
196
 
197
      procedure Build_Credit_Record
198
                              ( Next_Transaction : acc_Transaction_Record ) is
199
         Dummy_Account : constant integer := 100;
200
      begin
201
            Next_Transaction.ID := Current_ID;
202
            Next_Transaction.Code := Credit;
203
            Next_Transaction.Priority := Current_Priority;
204
 
205
            Next_Transaction.Account_Number := Dummy_Account;
206
            Current_ID := Current_ID + 1;
207
      end Build_Credit_Record;
208
 
209
 
210
      procedure Build_Debit_Record
211
                              ( Next_Transaction : acc_Transaction_Record ) is
212
         Dummy_Account : constant integer := 200;
213
      begin
214
            Next_Transaction.ID := Current_ID;
215
            Next_Transaction.Code := Debit;
216
 
217
            Next_Transaction.Account_Number := Dummy_Account;
218
            Current_ID := Current_ID + 1;
219
      end Build_Debit_Record;
220
 
221
   begin
222
 
223
      accept Start;   -- Wait for trigger from Main
224
 
225
      for Transaction_Numb in TC_Trans_Range loop  -- TC: limit the loop
226
         declare
227
            -- Create a task for the next message
228
            Next_Message_Task : acc_Message_Task := new Message_Task;
229
            -- Create a record for it
230
            Next_Transaction : acc_Transaction_Record
231
                                                 := new Transaction_Record;
232
         begin
233
            if Transaction_Numb = TC_Trans_Range'first then
234
               -- Send the first Credit message
235
               Build_Credit_Record ( Next_Transaction );
236
               Next_Message_Task.Accept_Transaction ( Next_Transaction );
237
               -- TC: Wait until the first message has been received by the
238
               -- Credit task and it has set the Overload indicator for the
239
               -- Distributor
240
               while not TC_First_Message_Has_Arrived.Value loop
241
                  delay ImpDef.Minimum_Task_Switch;
242
               end loop;
243
            elsif Transaction_Numb = TC_Trans_Range'last then
244
               -- For this test send the last transaction to the Debit task
245
               -- to improve the mix
246
               Build_Debit_Record( Next_Transaction );
247
               Next_Message_Task.Accept_Transaction ( Next_Transaction );
248
            else
249
               -- TC: Alternate high and low priority transactions
250
               if Current_Priority = High then
251
                  Current_Priority := Low;
252
               else
253
                  Current_Priority := High;
254
               end if;
255
               Build_Credit_Record( Next_Transaction );
256
               Next_Message_Task.Accept_Transaction ( Next_Transaction );
257
            end if;
258
         end;   -- declare
259
      end loop;
260
 
261
      -- TC: Wait for Credit_Overloaded to be cleared, then insure that the
262
      -- Distributor has evalated all tasks. Otherwise, some tasks may never
263
      -- be evaluated.
264
      while Credit_Overloaded.Value loop
265
        delay ImpDef.Minimum_Task_Switch;
266
      end loop;
267
      Distributor.TC_Credit_OK;
268
 
269
   exception
270
      when others =>
271
         Report.Failed ("Unexpected exception in Line_Driver");
272
   end Line_Driver;
273
 
274
 
275
 
276
 
277
   task body Message_Task is
278
 
279
      TC_Original_Transaction_Code : Transaction_Code;
280
      This_Transaction : acc_Transaction_Record := new Transaction_Record;
281
 
282
   begin
283
 
284
      accept Accept_Transaction (In_Transaction : acc_Transaction_Record) do
285
         This_Transaction.all := In_Transaction.all;
286
      end Accept_Transaction;
287
 
288
      -- Note the original code to ensure correct return
289
      TC_Original_Transaction_Code := This_Transaction.Code;
290
 
291
      -- Queue up on Distributor's Input queue
292
      Distributor.Input ( This_Transaction );
293
      -- This task will now wait for the requeued rendezvous
294
      -- to complete before proceeding
295
 
296
      -- After the required computations have been performed
297
      -- return the Transaction_Record appropriately (probably to an output
298
      -- line driver)
299
      null;            -- stub
300
 
301
      -- For the test check that the return values are as expected
302
      if TC_Original_Transaction_Code /= This_Transaction.Code then
303
         -- Incorrect rendezvous
304
         Report.Failed ("Message Task: Incorrect code returned");
305
      end if;
306
 
307
      if This_Transaction.Code = Credit then
308
         if This_Transaction.Return_Value  /= Credit_Return or
309
            This_Transaction.Time_Stamp     = Base_Time     then
310
               Report.Failed ("Expected path not traversed");
311
         end if;
312
            TC_Tasks_Completed.Increment;
313
      else
314
         if This_Transaction.Return_Value  /= Debit_Return or
315
            This_Transaction.Message_Count /= 1             or
316
            This_Transaction.Time_Stamp     = Base_Time     then
317
               Report.Failed ("Expected path not traversed");
318
         end if;
319
         TC_Debit_Message_Complete.Set_True;
320
      end if;
321
 
322
   exception
323
      when others =>
324
         Report.Failed ("Unexpected exception in Message_Task");
325
 
326
   end Message_Task;
327
 
328
 
329
 
330
 
331
   -- Dispose each input Transaction_Record to the appropriate
332
   -- computation tasks
333
   --
334
   task body Distributor is
335
   begin
336
      loop
337
         select
338
            accept Input (Transaction : acc_Transaction_Record) do
339
               -- Time_Stamp the messages with the current time
340
               --    TC: Used, incidentally, by the test to check that the
341
               --    message did pass through the Distributor Task
342
               Transaction.Time_Stamp := Ada.Calendar.Clock;
343
 
344
               -- Pass this transaction on to the appropriate computation
345
               -- task but temporarily hold low-priority transactions under
346
               -- overload conditions
347
               case Transaction.Code is
348
                  when Credit =>
349
                     if Credit_Overloaded.Value and
350
                        Transaction.Priority = Low then
351
                        requeue Wait_for_Underload with abort;
352
                     else
353
                        requeue Credit_Computation.Input with abort;
354
                     end if;
355
                  when Debit =>
356
                     requeue Debit_Computation.Input with abort;
357
               end case;
358
            end Input;
359
         or
360
            when not Credit_Overloaded.Value =>
361
            accept Wait_for_Underload (Transaction : acc_Transaction_Record) do
362
               requeue Credit_Computation.Input with abort;
363
            end Wait_for_Underload;
364
         or
365
            accept TC_Credit_OK;
366
               -- We need this to insure that we evaluate the guards at least
367
               -- once when Credit_Overloaded is False. Otherwise, tasks
368
               -- could stay queued on Wait_for_Underload forever (starvation).
369
         or
370
            terminate;
371
         end select;
372
      end loop;
373
 
374
   exception
375
      when others =>
376
         Report.Failed ("Unexpected exception in Distributor");
377
   end Distributor;
378
 
379
 
380
 
381
   -- Computation task.  After the computation is performed the rendezvous
382
   -- in the original message task is completed.
383
   --
384
   task body Credit_Computation is
385
 
386
      Message_Count   : integer := 0;
387
 
388
   begin
389
      loop
390
         select
391
            accept Input ( Transaction : acc_Transaction_Record) do
392
               if Credit_Overloaded.Value and
393
                  Transaction.Priority = Low then
394
                  -- We should not be getting any Low Priority messages. They
395
                  -- should be waiting on the Distributor's Wait_for_Underload
396
                  -- queue
397
                  Report.Failed
398
                     ("Credit Task: Low priority transaction during overload");
399
               end if;
400
               -- Perform the computations required for this transaction
401
               null; -- stub
402
 
403
               -- For the test:
404
               if Transaction.Time_Stamp = Base_Time then
405
                  Report.Failed
406
                         ("Credit Task: Wrong queue, Distributor bypassed");
407
               end if;
408
               if Transaction.code /= Credit then
409
                  Report.Failed
410
                         ("Credit Task: Requeue delivered to the wrong queue");
411
               end if;
412
 
413
               -- The following is all Test Control code:
414
               Transaction.Return_Value := Credit_Return;
415
               Message_Count := Message_Count + 1;
416
               --
417
               -- Now take special action depending on which Message
418
               if Message_Count = 1 then
419
                  -- After the first message :
420
                  Credit_Overloaded.Set_True;
421
                  -- Now flag the Line_Driver that the second and subsequent
422
                  -- messages may now be sent
423
                  TC_First_Message_Has_Arrived.Set_True;
424
               end if;
425
               if Message_Count = 3 then
426
                  -- The two high priority transactions created subsequent
427
                  -- to the overload have now been processed
428
                  Credit_Overloaded.Set_False;
429
               end if;
430
            end Input;
431
         or
432
            terminate;
433
         end select;
434
      end loop;
435
   exception
436
      when others =>
437
         Report.Failed ("Unexpected exception in Credit_Computation");
438
   end Credit_Computation;
439
 
440
 
441
 
442
   -- Computation task.  After the computation is performed the rendezvous
443
   -- in the original message task is completed.
444
   --
445
   task body Debit_Computation is
446
      Message_Count   : integer := 0;
447
   begin
448
      loop
449
         select
450
            accept Input (Transaction : acc_Transaction_Record) do
451
               -- Perform the computations required for this message
452
               null;      -- stub
453
 
454
               -- For the test:
455
               if Transaction.Time_Stamp = Base_Time then
456
                  Report.Failed
457
                         ("Debit Task: Wrong queue, Distributor bypassed");
458
               end if;
459
               if Transaction.code /= Debit then
460
                  Report.Failed
461
                         ("Debit Task: Requeue delivered to the wrong queue");
462
               end if;
463
 
464
               -- for the test plug a known value and count
465
               Transaction.Return_Value := Debit_Return;
466
               -- one, and only one, message should pass through
467
               Message_Count := Message_Count + 1;
468
               Transaction.Message_Count := Message_Count;
469
            end Input;
470
         or
471
            terminate;
472
         end select;
473
      end loop;
474
   exception
475
      when others =>
476
         Report.Failed ("Unexpected exception in Debit_Computation");
477
 
478
 
479
   end Debit_Computation;
480
 
481
 
482
begin -- c954012
483
   Report.Test ("C954012", "Requeue within an accept body" &
484
                           " to another entry in the same task");
485
 
486
   Line_Driver.Start;  -- Start the test
487
 
488
   -- Ensure that the message tasks complete before reporting the result
489
   while (TC_Tasks_Completed.Count < TC_Credit_Messages_Expected)
490
         or (not TC_Debit_Message_Complete.Value) loop
491
      delay ImpDef.Minimum_Task_Switch;
492
   end loop;
493
 
494
   Report.Result;
495
 
496
end C954012;

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