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-- C974010.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 to

--      a task that has already terminated.

--

--      Check that Tasking_Error is properly propagated to the asynchronous

--      select statement and thus the sequence of statements of the triggering

--      alternative is not executed after the abortable part is left.

--

--      Check that Tasking_Error is re-raised immediately following the

--      asynchronous select.

--

-- TEST DESCRIPTION:

--

--      Use a small subset of the base Automated Teller Machine simulation

--      which is shown in greater detail in other tests of this series.

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

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

--      terminated before the entry call.  Use stripped down versions of

--      the  called procedures to check the correct path in the test.

--

--

-- CHANGE HISTORY:

--      06 Dec 94   SAIC    ACVC 2.0

--

--!

package C974010_0 is  -- Automated teller machine abstraction.

   Transaction_Canceled : exception;

   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;

   task type ATM_Keyboard_Task is

      entry Cancel_Pressed;

   end ATM_Keyboard_Task;

   procedure Validate_Card (Card : in 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 C974010_0;

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

with Report;

package body C974010_0 is

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

   --

   task body ATM_Keyboard_Task is

      TC_Suicide  : exception;

      Key_Pressed : Key_Enum := None;

   begin

      raise TC_Suicide;   -- Simulate early, unexpected termination

      accept Cancel_Pressed do        -- queued entry call.

         null;  --:::: user code for cancel

      end Cancel_Pressed;

   exception

      when TC_Suicide =>

         null;  -- This is the expected test behavior

      when others =>

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

   end ATM_Keyboard_Task;

   procedure Validate_Card (Card : in ATM_Card_Type) is

   begin

      Report.Failed ("Abortable part was executed");

   end Validate_Card;

   procedure Perform_Transaction (Card : in ATM_Card_Type) is

   begin

      Report.Failed ("Exception not re-raised immediately following " &

                     "asynchronous select");

   end Perform_Transaction;

end C974010_0;

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

with Report;

with ImpDef;

with C974010_0;  -- Automated teller machine abstraction.

use  C974010_0;

procedure C974010 is

   Card_Data : ATM_Card_Type;

   TC_Tasking_Error_Handled : Boolean := false;

begin  -- Main program.

   Report.Test ("C974010", "Asynchronous Select: Trigger is a call to a " &

                           "task entry of a task that is already completed");

   declare

      -- Create the task for this transaction

      Keyboard : C974010_0.ATM_Keyboard_Task;

   begin

      -- Ensure the task is already completed before calling

      --

      while not Keyboard'terminated loop

         delay ImpDef.Minimum_Task_Switch;

      end loop;

      --                                    --

      -- Asynchronous select is tested here --

      --                                    --

      select

         Keyboard.Cancel_Pressed;

         raise Transaction_Canceled;  -- Should not be executed.

      then abort

         -- Since the triggering call is not queued the abortable part

         -- should not be executed.

         --

         Validate_Card (Card_Data);

      end select;

      --

      -- The propagated exception is re-raised here.

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

   exception

      when Transaction_Canceled =>

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

                        "executed");

      when Tasking_Error =>

         -- This is the expected test path

         TC_Tasking_Error_Handled := true;

      when others       =>

         Report.Failed ("Wrong exception raised: ");

   end;

   if not TC_Tasking_Error_Handled then

      Report.Failed ("Tasking_Error not properly propagated");

   end if;

   Report.Result;

exception

   when Tasking_Error =>

        Report.Failed ("Tasking_Error propagated to wrong handler");

        Report.Result;

end C974010;