| -- C954015.A |
| -- |
| -- Grant of Unlimited Rights |
| -- |
| -- Under contracts F33600-87-D-0337, F33600-84-D-0280, MDA903-79-C-0687, |
| -- F08630-91-C-0015, and DCA100-97-D-0025, the U.S. Government obtained |
| -- unlimited rights in the software and documentation contained herein. |
| -- Unlimited rights are defined in DFAR 252.227-7013(a)(19). By making |
| -- this public release, the Government intends to confer upon all |
| -- recipients unlimited rights equal to those held by the Government. |
| -- These rights include rights to use, duplicate, release or disclose the |
| -- released technical data and computer software in whole or in part, in |
| -- any manner and for any purpose whatsoever, and to have or permit others |
| -- to do so. |
| -- |
| -- DISCLAIMER |
| -- |
| -- ALL MATERIALS OR INFORMATION HEREIN RELEASED, MADE AVAILABLE OR |
| -- DISCLOSED ARE AS IS. THE GOVERNMENT MAKES NO EXPRESS OR IMPLIED |
| -- WARRANTY AS TO ANY MATTER WHATSOEVER, INCLUDING THE CONDITIONS OF THE |
| -- SOFTWARE, DOCUMENTATION OR OTHER INFORMATION RELEASED, MADE AVAILABLE |
| -- OR DISCLOSED, OR THE OWNERSHIP, MERCHANTABILITY, OR FITNESS FOR A |
| -- PARTICULAR PURPOSE OF SAID MATERIAL. |
| --* |
| -- |
| -- OBJECTIVE: |
| -- Check that requeued calls to task entries may, in turn, be requeued. |
| -- Check that the intermediate requeues are not blocked and that the |
| -- original caller remains blocked until the last requeue is complete. |
| -- This test uses: |
| -- Call with parameters |
| -- Requeue with abort |
| -- |
| -- TEST DESCRIPTION |
| -- A call is placed on the input queue of the Distributor. The |
| -- Distributor requeues to the Credit task; the Credit task requeues to a |
| -- secondary task which, in turn requeues to yet another task. This |
| -- continues down the chain. At the furthest point of the chain the |
| -- rendezvous is completed. To verify the action, the furthest task |
| -- waits in the accept statement for a second message to arrive before |
| -- completing. This second message can only arrive if none of the earlier |
| -- tasks in the chain are blocked waiting for completion. Apart from |
| -- the two Credit messages which are used to check the requeue chain one |
| -- Debit message is sent to validate the mix. |
| -- |
| -- |
| -- This series of tests uses a simulation of a transaction driven |
| -- processing system. Line Drivers accept input from an external source |
| -- and build them into transaction records. These records are then |
| -- encapsulated in message tasks which remain extant for the life of the |
| -- transaction in the system. The message tasks put themselves on the |
| -- input queue of a Distributor which, from information in the |
| -- transaction and/or system load conditions forwards them to other |
| -- operating tasks. These in turn might forward the transactions to yet |
| -- other tasks for further action. The routing is, in real life, dynamic |
| -- and unpredictable at the time of message generation. All rerouting in |
| -- this model is done by means of requeues. |
| -- |
| -- |
| -- CHANGE HISTORY: |
| -- 06 Dec 94 SAIC ACVC 2.0 |
| -- |
| --! |
| |
| |
| with Report; |
| with ImpDef; |
| |
| procedure C954015 is |
| |
| -- Arbitrary test values |
| Credit_Return : constant := 1; |
| Debit_Return : constant := 2; |
| |
| -- Mechanism to count the number of Credit Message tasks completed |
| protected TC_Tasks_Completed is |
| procedure Increment; |
| function Count return integer; |
| private |
| Number_Complete : integer := 0; |
| end TC_Tasks_Completed; |
| |
| TC_Expected_To_Complete : constant integer := 3; |
| |
| |
| -- Values added to the Return_Value indicating passage through the |
| -- particular task |
| TC_Credit_Value : constant integer := 1; |
| TC_Sub_1_Value : constant integer := 2; |
| TC_Sub_2_Value : constant integer := 3; |
| TC_Sub_3_Value : constant integer := 4; |
| TC_Sub_4_Value : constant integer := 5; |
| -- |
| TC_Full_Value : integer := TC_Credit_Value + TC_Sub_1_Value + |
| TC_Sub_2_Value + TC_Sub_3_Value + |
| TC_Sub_4_Value; |
| |
| type Transaction_Code is (Credit, Debit); |
| |
| type Transaction_Record; |
| type acc_Transaction_Record is access Transaction_Record; |
| type Transaction_Record is |
| record |
| ID : integer := 0; |
| Code : Transaction_Code := Debit; |
| Account_Number : integer := 0; |
| Stock_Number : integer := 0; |
| Quantity : integer := 0; |
| Return_Value : integer := 0; |
| TC_Message_Count : integer := 0; |
| TC_Thru_Distrib : Boolean := false; |
| end record; |
| |
| |
| task type Message_Task is |
| entry Accept_Transaction (In_Transaction : acc_Transaction_Record); |
| end Message_Task; |
| type acc_Message_Task is access Message_Task; |
| |
| task Line_Driver is |
| entry Start; |
| end Line_Driver; |
| |
| task Distributor is |
| entry Input(Transaction : acc_Transaction_Record); |
| end Distributor; |
| |
| task Credit_Computation is |
| entry Input(Transaction : acc_Transaction_Record); |
| end Credit_Computation; |
| |
| task Debit_Computation is |
| entry Input(Transaction : acc_Transaction_Record); |
| end Debit_Computation; |
| |
| -- The following are almost identical for the purpose of the test |
| task Credit_Sub_1 is |
| entry Input(Transaction : acc_Transaction_Record); |
| end Credit_Sub_1; |
| -- |
| task Credit_Sub_2 is |
| entry Input(Transaction : acc_Transaction_Record); |
| end Credit_Sub_2; |
| -- |
| task Credit_Sub_3 is |
| entry Input(Transaction : acc_Transaction_Record); |
| end Credit_Sub_3; |
| |
| -- This is the last in the chain |
| task Credit_Sub_4 is |
| entry Input(Transaction : acc_Transaction_Record); |
| end Credit_Sub_4; |
| |
| |
| -- Mechanism to count the number of Message tasks completed (Credit) |
| protected body TC_Tasks_Completed is |
| procedure Increment is |
| begin |
| Number_Complete := Number_Complete + 1; |
| end Increment; |
| |
| function Count return integer is |
| begin |
| return Number_Complete; |
| end Count; |
| end TC_Tasks_Completed; |
| |
| |
| |
| -- Assemble messages received from an external source |
| -- Creates a message task for each. The message tasks remain extant |
| -- for the life of the messages in the system. |
| -- The Line Driver task would normally be designed to loop continuously |
| -- creating the messages as input is received. Simulate this |
| -- but limit it to the number of dummy messages needed for this |
| -- test and allow it to terminate at that point. |
| -- |
| task body Line_Driver is |
| Current_ID : integer := 1; |
| TC_Last_was_for_credit : Boolean := false; |
| |
| -- Arbitrary limit for the number of messages sent for this test |
| type TC_Trans_Range is range 1..3; |
| |
| procedure Build_Credit_Record |
| ( Next_Transaction : acc_Transaction_Record ) is |
| Dummy_Account : constant integer := 100; |
| begin |
| Next_Transaction.ID := Current_ID; |
| Next_Transaction.Code := Credit; |
| Next_Transaction.Account_Number := Dummy_Account; |
| Current_ID := Current_ID + 1; |
| end Build_Credit_Record; |
| |
| procedure Build_Debit_Record |
| ( Next_Transaction : acc_Transaction_Record ) is |
| Dummy_Account : constant integer := 200; |
| begin |
| Next_Transaction.ID := Current_ID; |
| Next_Transaction.Code := Debit; |
| Next_Transaction.Account_Number := Dummy_Account; |
| Current_ID := Current_ID + 1; |
| end Build_Debit_Record; |
| |
| |
| begin |
| |
| accept Start; -- wait for trigger from Main |
| |
| -- Arbitrarily limit the loop to the number needed for this test only |
| for Transaction_Numb in TC_Trans_Range loop |
| declare |
| -- Create a task for the next message |
| Next_Message_Task : acc_Message_Task := new Message_Task; |
| -- Create a record for it |
| Next_Transaction : acc_Transaction_Record := |
| new Transaction_Record; |
| begin |
| -- Artificially send out in the order required |
| case Transaction_Numb is |
| when 1 => |
| Build_Credit_Record( Next_Transaction ); |
| when 2 => |
| Build_Credit_Record( Next_Transaction ); |
| when 3 => |
| Build_Debit_Record ( Next_Transaction ); |
| end case; |
| |
| -- Present the record to the message task |
| Next_Message_Task.Accept_Transaction ( Next_Transaction ); |
| end; -- declare |
| end loop; |
| |
| exception |
| when others => |
| Report.Failed ("Unexpected exception in Line_Driver"); |
| end Line_Driver; |
| |
| |
| |
| task body Message_Task is |
| |
| TC_Original_Transaction_Code : Transaction_Code; |
| This_Transaction : acc_Transaction_Record := new Transaction_Record; |
| |
| begin |
| |
| accept Accept_Transaction (In_Transaction : acc_Transaction_Record) do |
| This_Transaction.all := In_Transaction.all; |
| end Accept_Transaction; |
| |
| -- Note the original code to ensure correct return |
| TC_Original_Transaction_Code := This_Transaction.Code; |
| |
| -- Queue up on Distributor's Input queue |
| Distributor.Input ( This_Transaction ); |
| -- This task will now wait for the requeued rendezvous |
| -- to complete before proceeding |
| |
| -- After the required computations have been performed |
| -- return the Transaction_Record appropriately (probably to an output |
| -- line driver) |
| null; -- stub |
| |
| |
| -- The following is all Test Control Code |
| |
| -- Check that the return values are as expected |
| if TC_Original_Transaction_Code /= This_Transaction.Code then |
| -- Incorrect rendezvous |
| Report.Failed ("Message Task: Incorrect code returned"); |
| end if; |
| |
| if This_Transaction.Code = Credit then |
| if This_Transaction.Return_Value /= TC_Full_Value or not |
| This_Transaction.TC_Thru_Distrib then |
| Report.Failed ("Expected path not traversed - CR"); |
| end if; |
| if |
| This_Transaction.TC_Message_Count not in 1..2 then |
| Report.Failed ("Incorrect Message Count"); |
| end if; |
| else |
| if This_Transaction.Return_Value /= Debit_Return or |
| This_Transaction.TC_Message_Count /= 1 or not |
| This_Transaction.TC_Thru_Distrib then |
| Report.Failed ("Expected path not traversed - DB"); |
| end if; |
| end if; |
| TC_Tasks_Completed.Increment; |
| exception |
| when others => |
| Report.Failed ("Unexpected exception in Message_Task"); |
| |
| end Message_Task; |
| |
| |
| |
| -- Dispose each input Transaction_Record to the appropriate |
| -- computation tasks |
| -- |
| task body Distributor is |
| |
| begin |
| loop |
| select |
| accept Input (Transaction : acc_Transaction_Record) do |
| -- Show that the message did pass through the Distributor Task |
| Transaction.TC_Thru_Distrib := true; |
| |
| -- Pass this transaction on to the appropriate computation |
| -- task |
| case Transaction.Code is |
| when Credit => |
| requeue Credit_Computation.Input with abort; |
| when Debit => |
| requeue Debit_Computation.Input with abort; |
| end case; |
| end Input; |
| or |
| terminate; |
| end select; |
| end loop; |
| |
| exception |
| when others => |
| Report.Failed ("Unexpected exception in Distributor"); |
| end Distributor; |
| |
| |
| |
| |
| -- Computation task. |
| -- Note: After the computation is performed in this task the message is |
| -- passed on for further processing to some subsidiary task. The choice |
| -- of subsidiary task is made according to criteria not specified in |
| -- this test. |
| -- |
| task body Credit_Computation is |
| Message_Count : integer := 0; |
| begin |
| loop |
| select |
| accept Input ( Transaction : acc_Transaction_Record) do |
| -- Perform the computations required for this transaction |
| null; -- stub |
| |
| -- For the test: |
| if not Transaction.TC_Thru_Distrib then |
| Report.Failed |
| ("Credit Task: Wrong queue, Distributor bypassed"); |
| end if; |
| if Transaction.code /= Credit then |
| Report.Failed |
| ("Credit Task: Requeue delivered to the wrong queue"); |
| end if; |
| |
| -- for the test, plug a known value and count |
| Transaction.Return_Value := TC_Credit_Value; |
| Message_Count := Message_Count + 1; |
| Transaction.TC_Message_Count := Message_Count; |
| |
| -- Depending on transaction content send it on to the |
| -- some other task for further processing |
| -- TC: Arbitrarily send the message on to Credit_Sub_1 |
| requeue Credit_Sub_1.Input with abort; |
| end Input; |
| or |
| terminate; |
| end select; |
| end loop; |
| exception |
| when others => |
| Report.Failed ("Unexpected exception in Credit_Computation"); |
| end Credit_Computation; |
| |
| |
| |
| task body Credit_Sub_1 is |
| begin |
| loop |
| select |
| accept Input(Transaction : acc_Transaction_Record) do |
| -- Process this transaction |
| null; -- stub |
| |
| -- Add the value showing passage through this task |
| Transaction.Return_Value := |
| Transaction.Return_Value + TC_Sub_1_Value; |
| -- Depending on transaction content send it on to the |
| -- some other task for further processing |
| -- Arbitrarily send the message on to Credit_Sub_2 |
| requeue Credit_Sub_2.Input with abort; |
| end Input; |
| or |
| terminate; |
| end select; |
| end loop; |
| exception |
| when others => |
| Report.Failed ("Unexpected exception in Credit_Sub_1"); |
| |
| end Credit_Sub_1; |
| |
| task body Credit_Sub_2 is |
| begin |
| loop |
| select |
| accept Input(Transaction : acc_Transaction_Record) do |
| -- Process this transaction |
| null; -- stub |
| |
| -- Add the value showing passage through this task |
| Transaction.Return_Value := |
| Transaction.Return_Value + TC_Sub_2_Value; |
| -- Depending on transaction content send it on to the |
| -- some other task for further processing |
| -- Arbitrarily send the message on to Credit_Sub_3 |
| requeue Credit_Sub_3.Input with abort; |
| end Input; |
| or |
| terminate; |
| end select; |
| end loop; |
| exception |
| when others => |
| Report.Failed ("Unexpected exception in Credit_Sub_2"); |
| end Credit_Sub_2; |
| |
| task body Credit_Sub_3 is |
| begin |
| loop |
| select |
| accept Input(Transaction : acc_Transaction_Record) do |
| -- Process this transaction |
| null; -- stub |
| |
| -- Add the value showing passage through this task |
| Transaction.Return_Value := |
| Transaction.Return_Value + TC_Sub_3_Value; |
| -- Depending on transaction content send it on to the |
| -- some other task for further processing |
| -- Arbitrarily send the message on to Credit_Sub_4 |
| requeue Credit_Sub_4.Input with abort; |
| end Input; |
| or |
| terminate; |
| end select; |
| end loop; |
| exception |
| when others => |
| Report.Failed ("Unexpected exception in Credit_Sub_3"); |
| end Credit_Sub_3; |
| |
| -- This is the last in the chain of tasks to which transactions will |
| -- be requeued |
| -- |
| task body Credit_Sub_4 is |
| |
| TC_First_Message : Boolean := true; |
| |
| begin |
| loop |
| select |
| accept Input(Transaction : acc_Transaction_Record) do |
| -- Process this transaction |
| null; -- stub |
| |
| -- Add the value showing passage through this task |
| Transaction.Return_Value := |
| Transaction.Return_Value + TC_Sub_4_Value; |
| -- TC: stay in the accept body dealing with the first message |
| -- until the second arrives. If any of the requeues are |
| -- blocked the test will hang here indicating failure |
| if TC_First_Message then |
| while Input'count = 0 loop |
| delay ImpDef.Minimum_Task_Switch; |
| end loop; |
| TC_First_Message := false; |
| end if; |
| -- for the second message, just complete the rendezvous |
| end Input; |
| or |
| terminate; |
| end select; |
| end loop; |
| exception |
| when others => |
| Report.Failed ("Unexpected exception in Credit_Sub_4"); |
| end Credit_Sub_4; |
| |
| |
| |
| -- Computation task. |
| -- Note: After the computation is performed in this task and the |
| -- accept body is completed the rendezvous in the original |
| -- message task is completed. |
| -- |
| task body Debit_Computation is |
| Message_Count : integer := 0; |
| begin |
| loop |
| select |
| accept Input (Transaction : acc_Transaction_Record) do |
| -- Perform the computations required for this message |
| null; -- stub |
| |
| -- For the test: |
| if not Transaction.TC_Thru_Distrib then |
| Report.Failed |
| ("Debit Task: Wrong queue, Distributor bypassed"); |
| end if; |
| if Transaction.code /= Debit then |
| Report.Failed |
| ("Debit Task: Requeue delivered to the wrong queue"); |
| end if; |
| |
| -- for the test plug a known value and count |
| Transaction.Return_Value := Debit_Return; |
| -- one, and only one, message should pass through |
| Message_Count := Message_Count + 1; |
| Transaction.TC_Message_Count := Message_Count; |
| end Input; |
| or |
| terminate; |
| end select; |
| end loop; |
| exception |
| when others => |
| Report.Failed ("Unexpected exception in Debit_Computation"); |
| |
| |
| end Debit_Computation; |
| |
| |
| begin |
| |
| Report.Test ("C954015", "Test multiple levels of requeue to task entry"); |
| |
| Line_Driver.Start; -- Start the test |
| |
| -- Ensure that the message tasks completed before calling Result |
| while (TC_Tasks_Completed.Count < TC_Expected_To_Complete) loop |
| delay ImpDef.Minimum_Task_Switch; |
| end loop; |
| |
| Report.Result; |
| |
| end C954015; |
