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-- C954020.A

--

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--                                    DISCLAIMER

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--     DISCLOSED ARE AS IS.  THE GOVERNMENT MAKES NO EXPRESS OR IMPLIED

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--*

--

-- OBJECTIVE:

--      Check that a call to a protected entry can be requeued to a task

--      entry. Check that the requeue is placed on the correct entry; that the

--      original caller waits for the completion of the requeue and continues

--      after the requeued rendezvous.  Check that the requeue does not block.

--      Specifically, check a requeue with abort from a protected entry to

--      an entry in a task.

--

-- TEST DESCRIPTION:

--

--      In the Distributor protected object, requeue two successive calls on

--      the entries of two separate target tasks.  Each task in each of the

--      paths adds identifying information in the transaction being passed.

--      This information is checked by the Message tasks on completion

--      ensuring that the requeues have been placed on the correct queues.

--      There is an artificial guard on the Credit Task to ensure that the

--      input is queued; this guard is released by the Debit task which

--      handles its input immediately.  This ensures that we have one of the

--      requeued items actually queued for later handling and also verifies

--      that the requeuing process (in the protected object) is not blocked.

--

--      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 object 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

--      06 Nov 95   SAIC    Fixed problems for ACVC 2.0.1

--

--!

with Report;

with ImpDef;

procedure C954020 is

   Verbose : constant Boolean := False;

   -- Arbitrary test values

   Credit_Return : constant := 1;

   Debit_Return  : constant := 2;

   protected type Message_Status is

      procedure Set_Complete;

      function Complete return Boolean;

   private

      Is_Complete : Boolean := False;

   end Message_Status;

   protected body Message_Status is

      procedure Set_Complete is

      begin

         Is_Complete := True;

      end Set_Complete;

      function Complete return Boolean is

      begin

         return Is_Complete;

      end Complete;

   end Message_Status;

   TC_Debit_Message : Message_Status;

   TC_Credit_Message : Message_Status;

   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_Dist     : 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 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;

   protected Time_Lock is

      procedure Credit_Start;

      function  Credit_Enabled return Boolean;

   private

      Credit_OK : Boolean := false;

   end Time_Lock;

   protected body Time_Lock is

      procedure Credit_Start is

      begin

         Credit_OK := true;

      end Credit_Start;

      function  Credit_Enabled return Boolean is

      begin

         return Credit_OK;

      end Credit_Enabled;

   end Time_Lock;

   protected Distributor is

      entry Input (Transaction : acc_Transaction_Record);

   end Distributor;

   --

   --

   -- Dispose each input Transaction_Record to the appropriate

   -- computation tasks

   --

   protected body Distributor is

      entry Input (Transaction : acc_Transaction_Record) when true is

                                                      -- barrier is always open

      begin

         -- Test Control: Set the indicator in the message to show it has

         -- passed through the Distributor object

         Transaction.TC_thru_Dist := 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;

   end Distributor;

   -- 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 two dummy messages 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;

      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

      for i in 1..2 loop  -- arbitrarily limit to two messages for the test

         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

            if TC_Last_was_for_credit then

               Build_Debit_Record ( Next_Transaction );

            else

               Build_Credit_Record( Next_Transaction );

               TC_Last_was_for_credit := true;

            end if;

            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;

      if Verbose then

         Report.Comment ("message task got " &

                         Transaction_Code'Image (This_Transaction.Code));

      end if;

      -- 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  /= Credit_Return or

            This_Transaction.TC_Message_Count /= 1          or

            not This_Transaction.TC_thru_Dist       then

               Report.Failed ("Expected path not traversed");

         end if;

         TC_Credit_Message.Set_Complete;

      else

         if This_Transaction.Return_Value  /= Debit_Return or

            This_Transaction.TC_Message_Count /= 1         or

            not This_Transaction.TC_thru_Dist       then

               Report.Failed ("Expected path not traversed");

         end if;

         TC_Debit_Message.Set_Complete;

      end if;

   exception

      when others =>

         Report.Failed ("Unexpected exception in Message_Task");

   end Message_Task;

   -- 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 Credit_Computation is

      Message_Count   : integer := 0;

   begin

      loop

         select

            when  Time_Lock.Credit_enabled =>

            accept Input ( Transaction : acc_Transaction_Record) do

               -- Perform the computations required for this transaction

               null;      -- stub

               if Verbose then

                  Report.Comment ("Credit_Computation in accept");

               end if;

               -- For the test:

               if not Transaction.TC_thru_Dist 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 := Credit_Return;

               -- one, and only one message should pass through

               Message_Count := Message_Count + 1;

               Transaction.TC_Message_Count := Message_Count;

            end Input;

            exit;   -- only handle 1 transaction

         else

            -- poll until we can accept credit transaction

            delay ImpDef.Clear_Ready_Queue;

         end select;

      end loop;

   exception

      when others =>

         Report.Failed ("Unexpected exception in Credit_Computation");

   end Credit_Computation;

   -- 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

               if Verbose then

                  Report.Comment ("Debit_Computation in accept");

               end if;

               -- For the test:

               if not Transaction.TC_thru_Dist 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;

               -- for the test: once we have completed the only Debit

               -- message release the Credit Messages which are queued

               -- on the Credit Input queue

               Time_Lock.Credit_Start;

            end Input;

         or

            terminate;

         end select;

      end loop;

   exception

      when others =>

         Report.Failed ("Unexpected exception in Debit_Computation");

   end Debit_Computation;

begin -- C954020

   Report.Test ("C954020", "Requeue, with abort, from protected entry " &

                                                         "to task entry");

   Line_Driver.Start;        -- Start the test

   -- Ensure that the message tasks complete before reporting the result

   while not (TC_Credit_Message.Complete and TC_Debit_Message.Complete) loop

      delay ImpDef.Minimum_Task_Switch;

   end loop;

   Report.Result;

end C954020;