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-- C974006.A
--
-- Grant of Unlimited Rights
--
-- 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;
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