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-- C974006.A

--

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--     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 the sequence of statements of the triggering alternative

--      of an asynchronous select statement is executed if the triggering

--      statement is a protected entry call, and the entry is accepted

--      immediately. Check that the corresponding entry body is executed

--      before the sequence of statements of the triggering alternative.

--      Check that the abortable part is not executed.

--

-- 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. Force the

--      entry call to be accepted immediately by calling this protected

--      procedure prior to the asynchronous select. Since the entry call

--      is accepted immediately, the abortable part should never start. When

--      entry call completes, the sequence of statements of the triggering

--      alternative should execute.

--

--

-- CHANGE HISTORY:

--      06 Dec 94   SAIC    ACVC 2.0

--

--!

package C974006_0 is  -- Automated teller machine abstraction.

   -- Flag for testing purposes:

   Entry_Body_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 C974006_0;

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

with Report;

package body C974006_0 is

   protected body ATM_Keyboard_Protected is

      entry Cancel_Pressed when (Last_Key_Pressed = Cancel) is

      begin

         Entry_Body_Executed := True;

      end Cancel_Pressed;

      procedure Read_Key is

      begin

         -- Simulate a procedure which processes 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

      Report.Failed ("Abortable part executed");

   end Validate_Card;

   procedure Perform_Transaction (Card : in ATM_Card_Type) is

   begin

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

                      "not fully executed");

   end Perform_Transaction;

end C974006_0;

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

with Report;

with C974006_0;  -- Automated teller machine abstraction.

use  C974006_0;

procedure C974006 is

   Card_Data : ATM_Card_Type;

begin

   Report.Test ("C974006", "ATC: trigger is protected entry call" &

                              " and completes first");

   Read_Card (Card_Data);

   declare

      Keyboard : C974006_0.ATM_Keyboard_Protected;

   begin

      -- Simulate the situation where the user hits cancel before the

      -- validation process can start:

      Keyboard.Read_Key;                 -- Force Keyboard.Cancel_Pressed to

                                         -- be accepted immediately.

      --                                    --

      -- Asynchronous select is tested here --

      --                                    --

      select

         Keyboard.Cancel_Pressed;        -- Entry call is accepted immediately,

                                         -- so abortable part does NOT start.

         if not Entry_Body_Executed then -- Executes after entry completes.

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

                           "executed before triggering statement complete");

         end if;

         raise Transaction_Canceled;     -- Control passes to exception

                                         -- handler.

      then abort

         Validate_Card (Card_Data);      -- Should not be executed.

      end select;

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

   exception

      when Transaction_Canceled =>

         null;

   end;

   Report.Result;

end C974006;