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-- C974008.A

--

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--

-- OBJECTIVE:

--      Check that the abortable part of an asynchronous select statement

--      is not started if the triggering statement is a task entry call, and

--      the entry call is not queued.

--

--      Check that the sequence of statements of the triggering alternative

--      is executed after the abortable part is left.

--

-- TEST DESCRIPTION:

--      Declare a main procedure containing an asynchronous select with a task

--      entry call as triggering statement.  Ensure that the task is waiting

--      at the accept statement so the rendezvous is executed immediately (the

--      entry call is not queued).

--

--

-- CHANGE HISTORY:

--      06 Dec 94   SAIC    ACVC 2.0

--

--!

package C974008_0 is  -- Automated teller machine abstraction.

   -- Flags for testing purposes:

   Triggering_Statement_Completed : Boolean := False;

   Count                          : Integer := 1234;  -- Global to defeat

                                                      -- optimization.

   type Key_Enum is (None, Cancel, Deposit, Withdraw);

   type Card_Number_Type is private;

   type Card_PIN_Type    is private;

   type ATM_Card_Type    is private;

   Transaction_Canceled : exception;

   task type ATM_Keyboard_Task is

      entry Cancel_Pressed;

   end ATM_Keyboard_Task;

   procedure Read_Card (Card : in out ATM_Card_Type);

   procedure Perform_Transaction (Card : in ATM_Card_Type);

private

   type Card_Number_Type is range   1 .. 9999;

   type Card_PIN_Type    is range 100 ..  999;

   type ATM_Card_Type is record

      Number : Card_Number_Type;

      PIN    : Card_PIN_Type;

   end record;

end C974008_0;

     --==================================================================--

with Report;

package body C974008_0 is

   procedure Listen_For_Input (Key : out Key_Enum) is

   begin

      -- Simulate the situation where the user presses the cancel key

      -- before the card is validated

      -- press the cancel key immediately

      Key := Cancel;

   end Listen_For_Input;

   -- One of these gets created as "Keyboard" for each transaction

   --

   task body ATM_Keyboard_Task is

      Key_Pressed : Key_Enum := None;

   begin

      -- NOTE:   Normal usage for this routine would be the loop with

      --         the select statement included.  This particular test

      --         requires that the task be waiting at the accept

      --         for the call.  To ensure that this is the case the

      --         extraneous commands are commented out (we leave them

      --         in this form to show the reader the surrounds to the

      --         fragment of code remaining)

      -- loop

         Listen_For_Input (Key_Pressed);

         -- select

            -- when (Key_Pressed = Cancel) =>                 -- Guard is now

               accept Cancel_Pressed do                    -- true, so accept

                  Triggering_Statement_Completed := True;  -- queued entry

               end Cancel_Pressed;                         -- call.

               -- User has cancelled the transaction so we exit the

               -- loop and allow the task to terminate

               -- exit;

         -- else

            -- Key_Pressed := None;

         -- end select;

      -- end loop;

   exception

      when others =>

          Report.Failed ("Unexpected Exception in ATM_Keyboard_Task");

   end ATM_Keyboard_Task;

   procedure Read_Card (Card : in out ATM_Card_Type) is

   begin

      Card.Number := 9999;

      Card.PIN    := 111;

   end Read_Card;

   procedure Perform_Transaction (Card : in ATM_Card_Type) is

   begin

      Report.Failed ("Triggering alternative sequence of statements " &

                     "not executed");

      if not Triggering_Statement_Completed then

         Report.Failed ("Triggering statement did not complete");

      end if;

   end Perform_Transaction;

end C974008_0;

     --==================================================================--

with Report;

with ImpDef;

with C974008_0;  -- Automated teller machine abstraction.

use  C974008_0;

procedure C974008 is

   Card_Data : ATM_Card_Type;

begin  -- Main program.

   Report.Test ("C974008", "Asynchronous Select: Trigger is a call to a " &

                           "waiting task entry and completes immediately");

   Read_Card (Card_Data);

   declare

      -- Create the task for this transaction

      Keyboard : C974008_0.ATM_Keyboard_Task;

   begin

      -- Ensure task is waiting at the accept

      -- This is the time required to activate another task and allow it

      -- to run to its first accept statement.

      --

      delay ImpDef.Switch_To_New_Task;

      --                                    --

      -- Asynchronous select is tested here --

      --                                    --

      select

         Keyboard.Cancel_Pressed;      -- Entry call is executed immediately

         raise Transaction_Canceled;   -- This is executed after Validate_Card

                                       -- is aborted.

      then abort

         -- In other similar tests Validate_Card is called here.  In this

         -- test we just check to see if the abortable part is called at

         -- all.  Since the triggering call is not queued the abortable

         -- part should not be started

         --

         Report.Failed ("Abortable part started");

      end select;

      Perform_Transaction (Card_Data); -- Should not be reached.

   exception

      when Transaction_Canceled =>

         if not Triggering_Statement_Completed then

            Report.Failed ("Triggering alternative sequence of statements " &

                           "executed but triggering statement not complete");

         end if;

   end;

   Report.Result;

end C974008;