1-- C954011.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 that a requeue is placed on the correct entry; that the 28-- original caller waits for the completion of the requeued rendezvous; 29-- that the original caller continues after the rendezvous. 30-- Specifically, this test checks requeue to an entry in a different 31-- task, requeue where the entry has parameters, and requeue with 32-- abort. 33-- 34-- TEST DESCRIPTION: 35-- In the Distributor task, requeue two successive calls on the entries 36-- of two separate target tasks. Each task in each of the paths adds 37-- identifying information in the transaction being passed. This 38-- information is checked by the Message tasks on completion ensuring that 39-- the requeues have been placed on the correct queues. 40-- 41-- This series of tests uses a simulation of a transaction driven 42-- processing system. Line Drivers accept input from an external source 43-- and build them into transaction records. These records are then 44-- encapsulated in message tasks which remain extant for the life of the 45-- transaction in the system. The message tasks put themselves on the 46-- input queue of a Distributor which, from information in the 47-- transaction and/or system load conditions forwards them to other 48-- operating tasks. These in turn might forward the transactions to yet 49-- other tasks for further action. The routing is, in real life, 50-- dynamic and unpredictable at the time of message generation. All 51-- rerouting in this model is done by means of requeues. 52-- 53-- 54-- CHANGE HISTORY: 55-- 06 Dec 94 SAIC ACVC 2.0 56-- 26 Nov 95 SAIC Fixed problems with shared global variables 57-- for ACVC 2.0.1 58-- 59--! 60 61with Report; 62with ImpDef; 63 64procedure C954011 is 65 66 67 -- Arbitrary test values 68 Credit_Return : constant := 1; 69 Debit_Return : constant := 2; 70 71 type Transaction_Code is (Credit, Debit); 72 73 type Transaction_Record; 74 type acc_Transaction_Record is access Transaction_Record; 75 type Transaction_Record is 76 record 77 ID : integer := 0; 78 Code : Transaction_Code := Debit; 79 Account_Number : integer := 0; 80 Stock_Number : integer := 0; 81 Quantity : integer := 0; 82 Return_Value : integer := 0; 83 TC_Message_Count : integer := 0; 84 TC_Thru_Distrib : Boolean := false; 85 end record; 86 87 protected type Message_Mgr is 88 procedure Mark_Complete; 89 function Is_Complete return Boolean; 90 private 91 Complete : Boolean := False; 92 end Message_Mgr; 93 94 protected body Message_Mgr is 95 procedure Mark_Complete is 96 begin 97 Complete := True; 98 end Mark_Complete; 99 100 Function Is_Complete return Boolean is 101 begin 102 return Complete; 103 end Is_Complete; 104 end Message_Mgr; 105 106 TC_Debit_Message : Message_Mgr; 107 TC_Credit_Message : Message_Mgr; 108 109 110 task type Message_Task is 111 entry Accept_Transaction (In_Transaction : acc_Transaction_Record); 112 end Message_Task; 113 type acc_Message_Task is access Message_Task; 114 115 task Line_Driver is 116 entry Start; 117 end Line_Driver; 118 119 task Distributor is 120 entry Input(Transaction : acc_Transaction_Record); 121 end Distributor; 122 123 task Credit_Computation is 124 entry Input(Transaction : acc_Transaction_Record); 125 end Credit_Computation; 126 127 task Debit_Computation is 128 entry Input(Transaction : acc_Transaction_Record); 129 end Debit_Computation; 130 131 132 133 -- Assemble messages received from an external source 134 -- Creates a message task for each. The message tasks remain extant 135 -- for the life of the messages in the system. 136 -- The Line Driver task would normally be designed to loop continuously 137 -- creating the messages as input is received. Simulate this 138 -- but limit it to two dummy messages for this test and allow it 139 -- to terminate at that point 140 -- 141 task body Line_Driver is 142 Current_ID : integer := 1; 143 TC_Last_was_for_credit : Boolean := false; 144 145 procedure Build_Credit_Record 146 ( Next_Transaction : acc_Transaction_Record ) is 147 Dummy_Account : constant integer := 100; 148 begin 149 Next_Transaction.ID := Current_ID; 150 Next_Transaction.Code := Credit; 151 152 Next_Transaction.Account_Number := Dummy_Account; 153 Current_ID := Current_ID + 1; 154 end Build_Credit_Record; 155 156 157 procedure Build_Debit_Record 158 ( Next_Transaction : acc_Transaction_Record ) is 159 Dummy_Account : constant integer := 200; 160 begin 161 Next_Transaction.ID := Current_ID; 162 Next_Transaction.Code := Debit; 163 164 Next_Transaction.Account_Number := Dummy_Account; 165 Current_ID := Current_ID + 1; 166 end Build_Debit_Record; 167 168 begin 169 170 accept Start; -- Wait for trigger from Main 171 172 for i in 1..2 loop -- arbitrarily limit to two messages for the test 173 declare 174 -- Create a task for the next message 175 Next_Message_Task : acc_Message_Task := new Message_Task; 176 -- Create a record for it 177 Next_Transaction : acc_Transaction_Record 178 := new Transaction_Record; 179 begin 180 if TC_Last_was_for_credit then 181 Build_Debit_Record ( Next_Transaction ); 182 else 183 Build_Credit_Record( Next_Transaction ); 184 TC_Last_was_for_credit := true; 185 end if; 186 Next_Message_Task.Accept_Transaction ( Next_Transaction ); 187 end; -- declare 188 end loop; 189 190 exception 191 when others => 192 Report.Failed ("Unexpected exception in Line_Driver"); 193 end Line_Driver; 194 195 196 197 198 task body Message_Task is 199 200 TC_Original_Transaction_Code : Transaction_Code; 201 This_Transaction : acc_Transaction_Record := new Transaction_Record; 202 203 begin 204 accept Accept_Transaction (In_Transaction : acc_Transaction_Record) do 205 This_Transaction.all := In_Transaction.all; 206 end Accept_Transaction; 207 208 -- Note the original code to ensure correct return 209 TC_Original_Transaction_Code := This_Transaction.Code; 210 211 -- Queue up on Distributor's Input queue 212 Distributor.Input ( This_Transaction ); 213 -- This task will now wait for the requeued rendezvous 214 -- to complete before proceeding 215 216 -- After the required computations have been performed 217 -- return the Transaction_Record appropriately (probably to an output 218 -- line driver) 219 null; -- stub 220 221 222 -- The following is all Test Control Code 223 224 -- Check that the return values are as expected 225 if TC_Original_Transaction_Code /= This_Transaction.Code then 226 -- Incorrect rendezvous 227 Report.Failed ("Message Task: Incorrect code returned"); 228 end if; 229 230 if This_Transaction.Code = Credit then 231 if This_Transaction.Return_Value /= Credit_Return or 232 This_Transaction.TC_Message_Count /= 1 or not 233 This_Transaction.TC_Thru_Distrib then 234 Report.Failed ("Expected path not traversed"); 235 end if; 236 TC_Credit_Message.Mark_Complete; 237 else 238 if This_Transaction.Return_Value /= Debit_Return or 239 This_Transaction.TC_Message_Count /= 1 or not 240 This_Transaction.TC_Thru_Distrib then 241 Report.Failed ("Expected path not traversed"); 242 end if; 243 TC_Debit_Message.Mark_Complete; 244 end if; 245 246 exception 247 when others => 248 Report.Failed ("Unexpected exception in Message_Task"); 249 250 end Message_Task; 251 252 253 254 -- Dispose each input Transaction_Record to the appropriate 255 -- computation tasks 256 -- 257 task body Distributor is 258 259 begin 260 loop 261 select 262 accept Input (Transaction : acc_Transaction_Record) do 263 -- Mark the message as having passed through the distributor 264 Transaction.TC_Thru_Distrib := true; 265 266 -- Pass this transaction on the appropriate computation 267 -- task 268 case Transaction.Code is 269 when Credit => 270 requeue Credit_Computation.Input with abort; 271 when Debit => 272 requeue Debit_Computation.Input with abort; 273 end case; 274 end Input; 275 or 276 terminate; 277 end select; 278 end loop; 279 280 exception 281 when others => 282 Report.Failed ("Unexpected exception in Distributor"); 283 end Distributor; 284 285 286 287 -- Computation task. 288 -- Note: After the computation is performed in this task and the 289 -- accept body is completed the rendezvous in the original 290 -- message task is completed. 291 -- 292 task body Credit_Computation is 293 Message_Count : integer := 0; 294 begin 295 loop 296 select 297 accept Input ( Transaction : acc_Transaction_Record) do 298 -- Perform the computations required for this transaction 299 null; -- stub 300 301 -- For the test: 302 if not Transaction.TC_Thru_Distrib then 303 Report.Failed 304 ("Credit Task: Wrong queue, Distributor bypassed"); 305 end if; 306 if Transaction.code /= Credit then 307 Report.Failed 308 ("Credit Task: Requeue delivered to the wrong queue"); 309 end if; 310 311 -- for the test plug a known value and count 312 Transaction.Return_Value := Credit_Return; 313 -- one, and only one message should pass through 314 Message_Count := Message_Count + 1; 315 Transaction.TC_Message_Count := Message_Count; 316 end Input; 317 or 318 terminate; 319 end select; 320 end loop; 321 exception 322 when others => 323 Report.Failed ("Unexpected exception in Credit_Computation"); 324 end Credit_Computation; 325 326 327 328 -- Computation task. 329 -- Note: After the computation is performed in this task and the 330 -- accept body is completed the rendezvous in the original 331 -- message task is completed. 332 -- 333 task body Debit_Computation is 334 Message_Count : integer := 0; 335 begin 336 loop 337 select 338 accept Input (Transaction : acc_Transaction_Record) do 339 -- Perform the computations required for this message 340 null; -- stub 341 342 -- For the test: 343 if not Transaction.TC_Thru_Distrib then 344 Report.Failed 345 ("Debit Task: Wrong queue, Distributor bypassed"); 346 end if; 347 if Transaction.code /= Debit then 348 Report.Failed 349 ("Debit Task: Requeue delivered to the wrong queue"); 350 end if; 351 352 -- for the test plug a known value and count 353 Transaction.Return_Value := Debit_Return; 354 -- one, and only one, message should pass through 355 Message_Count := Message_Count + 1; 356 Transaction.TC_Message_Count := Message_Count; 357 end Input; 358 or 359 terminate; 360 end select; 361 end loop; 362 exception 363 when others => 364 Report.Failed ("Unexpected exception in Debit_Computation"); 365 366 367 end Debit_Computation; 368 369 370begin -- c954011 371 372 Report.Test ("C954011", "Requeue from task body to task entry"); 373 374 Line_Driver.Start; -- Start the test 375 376 -- Ensure that the message tasks complete before reporting the result 377 while not (TC_Credit_Message.Is_Complete and 378 TC_Debit_Message.Is_Complete) loop 379 delay ImpDef.Minimum_Task_Switch; 380 end loop; 381 382 Report.Result; 383 384end C954011; 385