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-- C974007.A

--

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--

-- OBJECTIVE:

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

--      of an asynchronous select statement is not executed if the triggering

--      statement is a protected entry call, and the entry is not accepted

--      before the abortable part completes. Check that execution continues

--      immediately following the asynchronous select.

--

-- TEST DESCRIPTION:

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

--      protected entry call as triggering statement. Declare a protected

--      procedure which sets the protected entry's barrier true. Ensure

--      that the entry call is never accepted by not calling the protected

--      procedure; the barrier remains false, and the entry call from

--      asynchronous select is queued. Since the abortable part will complete

--      before the entry is accepted, the sequence of statements of the

--      triggering alternative is never executed.

--

--

-- CHANGE HISTORY:

--      06 Dec 94   SAIC    ACVC 2.0

--

--!

package C974007_0 is  -- Automated teller machine abstraction.

   -- Flags for testing purposes:

   --

   Abortable_Part_Executed       : Boolean := False;

   Perform_Transaction_Executed  : Boolean := False;

   Triggering_Statement_Executed : Boolean := False;

   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;

   protected type ATM_Keyboard_Protected is

      entry Cancel_Pressed;

      procedure Read_Key;

   private

      Last_Key_Pressed : Key_Enum := None;

   end ATM_Keyboard_Protected;

   procedure Read_Card (Card : in out ATM_Card_Type);

   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 C974007_0;

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

with Report;

package body C974007_0 is

   protected body ATM_Keyboard_Protected is

      -- Barrier is false for the live of the test

      entry Cancel_Pressed when (Last_Key_Pressed = Cancel) is

      begin

      Triggering_Statement_Executed  := true;   -- Test has failed

      -- (Note: cannot call Report.Failed in the protected entry body]

      end Cancel_Pressed;

      procedure Read_Key is                                     -- Never

      begin                                                     -- called.

         -- Simulate a procedure which reads user keyboard input, and

         -- which is called by some interrupt handler.

         Last_Key_Pressed := Cancel;

      end Read_Key;

   end ATM_Keyboard_Protected;

   procedure Read_Card (Card : in out ATM_Card_Type) is

   begin

      Card.Number := 9999;

      Card.PIN    := 111;

   end Read_Card;

   procedure Validate_Card (Card : in ATM_Card_Type) is

   begin

      Abortable_Part_Executed := True;

   end Validate_Card;

   procedure Perform_Transaction (Card : in ATM_Card_Type) is

   begin

      Perform_Transaction_Executed := True;

   end Perform_Transaction;

end C974007_0;

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

with Report;

with C974007_0;  -- Automated teller machine abstraction.

use  C974007_0;

procedure C974007 is

   Card_Data : ATM_Card_Type;

begin

   Report.Test ("C974007", "ATC: trigger is protected entry call" &

                              " and abortable part completes first");

   Read_Card (Card_Data);

   declare

      Keyboard : C974007_0.ATM_Keyboard_Protected;

   begin

      --                                    --

      -- Asynchronous select is tested here --

      --                                    --

      select

         Keyboard.Cancel_Pressed;        -- Barrier is never set true, so

                                         -- entry call is queued and never

                                         -- accepted.

         raise Transaction_Canceled;     -- Should not be executed.

      then abort

         Validate_Card (Card_Data);      -- This call completes before

                                         -- Keyboard.Cancel_Pressed can be

                                         -- accepted.

      end select;

      Perform_Transaction (Card_Data);   -- Execution proceeds here after

                                         -- Validate_Card completes.

   exception

      when Transaction_Canceled =>

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

                        "executed");

   end;

   if Triggering_Statement_Executed  then

      Report.Failed ("Triggering statement was executed");

   end if;

   if not Abortable_Part_Executed then

      Report.Failed ("Abortable part not executed");

   end if;

   if not Perform_Transaction_Executed then

      Report.Failed ("Statements following asynchronous select not " &

                     "executed");

   end if;

   Report.Result;

end C974007;