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1 149 jeremybenn
-- C974004.A
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--
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--
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--                             Grant of Unlimited Rights
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--
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--     Under contracts F33600-87-D-0337, F33600-84-D-0280, MDA903-79-C-0687,
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--     F08630-91-C-0015, and DCA100-97-D-0025, the U.S. Government obtained
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--     unlimited rights in the software and documentation contained herein.
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--     Unlimited rights are defined in DFAR 252.227-7013(a)(19).  By making
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--     this public release, the Government intends to confer upon all
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--     recipients unlimited rights  equal to those held by the Government.
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--     These rights include rights to use, duplicate, release or disclose the
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--     released technical data and computer software in whole or in part, in
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--     any manner and for any purpose whatsoever, and to have or permit others
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--     to do so.
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--
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--                                    DISCLAIMER
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--
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--     ALL MATERIALS OR INFORMATION HEREIN RELEASED, MADE AVAILABLE OR
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--     DISCLOSED ARE AS IS.  THE GOVERNMENT MAKES NO EXPRESS OR IMPLIED
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--     WARRANTY AS TO ANY MATTER WHATSOEVER, INCLUDING THE CONDITIONS OF THE
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--     SOFTWARE, DOCUMENTATION OR OTHER INFORMATION RELEASED, MADE AVAILABLE
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--     OR DISCLOSED, OR THE OWNERSHIP, MERCHANTABILITY, OR FITNESS FOR A
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--     PARTICULAR PURPOSE OF SAID MATERIAL.
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--*
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--
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-- OBJECTIVE:
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--      Check that the abortable part of an asynchronous select statement
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--      is aborted if it does not complete before the triggering statement
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--      completes, where the triggering statement is a task entry call,
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--      the entry call is queued, and the entry call completes by propagating
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--      an exception and that the sequence of statements of the triggering
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--      alternative is not executed after the abortable part is left and that
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--      the exception propagated by the entry call is re-raised immediately
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--      following the asynchronous select.
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--
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-- TEST DESCRIPTION:
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--      Declare a main procedure containing an asynchronous select with a task
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--      entry call as triggering statement. Force the entry call to be
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--      queued by having the task call a procedure, prior to the corresponding
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--      accept statement, which simulates a routine waiting for user input
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--      (with a delay).
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--
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--      Simulate a time-consuming routine in the abortable part by calling a
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--      procedure containing an infinite loop. Meanwhile, simulate input by
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--      the user (the delay expires), which causes the task to execute the
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--      accept statement corresponding to the triggering entry call. Raise
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--      an exception in the accept statement which is not handled by the task,
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--      and which is thus propagated to the caller.
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--
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--
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-- CHANGE HISTORY:
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--      06 Dec 94   SAIC    ACVC 2.0
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--
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--!
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package C974004_0 is  -- Automated teller machine abstraction.
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   -- Flags for testing purposes:
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   Count                          : Integer := 1234;  -- Global to defeat
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                                                      -- optimization.
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   Propagated_From_Task : exception;
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   type Key_Enum is (None, Cancel, Deposit, Withdraw);
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   type Card_Number_Type is private;
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   type Card_PIN_Type    is private;
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   type ATM_Card_Type    is private;
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   Transaction_Canceled : exception;
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   task type ATM_Keyboard_Task is
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      entry Cancel_Pressed;
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   end ATM_Keyboard_Task;
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   procedure Read_Card (Card : in out ATM_Card_Type);
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   procedure Validate_Card (Card : in ATM_Card_Type);
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   procedure Perform_Transaction (Card : in ATM_Card_Type);
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private
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   type Card_Number_Type is range   1 .. 9999;
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   type Card_PIN_Type    is range 100 ..  999;
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   type ATM_Card_Type is record
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      Number : Card_Number_Type;
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      PIN    : Card_PIN_Type;
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   end record;
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end C974004_0;
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     --==================================================================--
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with Report;
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with ImpDef;
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package body C974004_0 is
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   procedure Listen_For_Input (Key : out Key_Enum) is
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   begin
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      -- Simulate the situation where a user waits a bit for the card to
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      -- be validated, then presses cancel before it completes.
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      -- Delay long enough to force queuing of Keyboard.Cancel_Pressed.
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      delay ImpDef.Clear_Ready_Queue;
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      if Report.Equal (3, 3) then  -- Always true.
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         Key := Cancel;
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      end if;
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   end Listen_For_Input;
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   -- One of these gets created as "Keyboard" for each transaction
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   --
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   task body ATM_Keyboard_Task is
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      Key_Pressed : Key_Enum := None;
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   begin
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      loop
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                                               -- Force entry calls to be
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         Listen_For_Input (Key_Pressed);       -- queued, then set guard to
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                                               -- true.
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         select
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            when (Key_Pressed = Cancel) =>     -- Guard is now true, so accept
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               accept Cancel_Pressed do        -- queued entry call.
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                  null;  --:::: user code for cancel
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                  -- Now simulate an unexpected exception arising in the
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                  -- user code
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                  raise Propagated_From_Task;  -- Propagate an exception.
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               end Cancel_Pressed;
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               Report.Failed
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                          ("Exception not propagated in ATM_Keyboard_Task");
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               -- User has canceled the transaction so we exit the
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               -- loop and allow the task to terminate
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               exit;
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         else
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            Key_Pressed := None;
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         end select;
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      end loop;
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   exception
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      when Propagated_From_Task =>
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          null;  -- This is the expected test behavior
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      when others =>
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          Report.Failed ("Unexpected Exception in ATM_Keyboard_Task");
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   end ATM_Keyboard_Task;
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   procedure Read_Card (Card : in out ATM_Card_Type) is
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   begin
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      Card.Number := 9999;
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      Card.PIN    := 111;
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   end Read_Card;
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   procedure Validate_Card (Card : in ATM_Card_Type) is
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   begin
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      -- Simulate an exceedingly long validation activity.
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      loop                                             -- Infinite loop.
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         Count := (Count + 1) mod Integer (Card.PIN);
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         -- Synch. point to allow transfer of control to Keyboard
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         -- task during this simulation
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         delay ImpDef.Minimum_Task_Switch;
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         exit when not Report.Equal (Count, Count);    -- Always false.
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      end loop;
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   end Validate_Card;
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   procedure Perform_Transaction (Card : in ATM_Card_Type) is
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   begin
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      Report.Failed ("Exception not re-raised immediately following " &
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                     "asynchronous select");
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      if Count = 1234 then
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         -- Initial value is unchanged
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         Report.Failed ("Abortable part did not execute");
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      end if;
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   end Perform_Transaction;
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end C974004_0;
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     --==================================================================--
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with Report;
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with C974004_0;  -- Automated teller machine abstraction.
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use  C974004_0;
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procedure C974004 is
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   Card_Data : ATM_Card_Type;
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begin  -- Main program.
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   Report.Test ("C974004", "Asynchronous Select: Trigger is queued on a " &
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                           "task entry and is completed first by an " &
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                           "exception");
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   Read_Card (Card_Data);
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   begin
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      declare
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         -- Create the task for this transaction
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         Keyboard : C974004_0.ATM_Keyboard_Task;
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      begin
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         --                                    --
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         -- Asynchronous select is tested here --
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         --                                    --
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         select
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            Keyboard.Cancel_Pressed;     -- Entry call initially queued, so
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                                         -- abortable part starts.
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            raise Transaction_Canceled;  -- Should not be executed.
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         then abort
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            Validate_Card (Card_Data);   -- Keyboard.Cancel_Pressed is accepted
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                                         -- and propagates an exception before
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                                         -- this call finishes; it is then
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                                         -- aborted.
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            -- Check that the whole of the abortable part is aborted, not
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            -- just the statement in the abortable part that was executing
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            -- at the time
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            Report.Failed ("Abortable part not aborted");
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         end select;
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                                         -- The propagated exception is
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                                         -- re-raised here; control passes to
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                                         -- the exception handler.
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         Perform_Transaction(Card_Data); -- Should not be reached.
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      exception
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         when Transaction_Canceled =>
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            Report.Failed ("Triggering alternative sequence of statements " &
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                           "executed");
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         when Propagated_From_Task =>
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            -- This is the expected test path
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            if Count = 1234 then
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               -- Initial value is unchanged
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               Report.Failed ("Abortable part did not execute");
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            end if;
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         when Tasking_Error  =>
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            Report.Failed ("Tasking_Error raised");
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         when others  =>
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            Report.Failed ("Wrong exception raised");
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      end;
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   exception
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      when Propagated_From_Task =>
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         Report.Failed ("Correct exception raised at wrong level");
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      when  others  =>
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         Report.Failed ("Wrong exception raised at wrong level");
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   end;
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   Report.Result;
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end C974004;

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