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-- C974008.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 abortable part of an asynchronous select statement
-- is not started if the triggering statement is a task entry call, and
-- the entry call is not queued.
--
-- Check that the sequence of statements of the triggering alternative
-- is executed after the abortable part is left.
--
-- TEST DESCRIPTION:
-- Declare a main procedure containing an asynchronous select with a task
-- entry call as triggering statement. Ensure that the task is waiting
-- at the accept statement so the rendezvous is executed immediately (the
-- entry call is not queued).
--
--
-- CHANGE HISTORY:
-- 06 Dec 94 SAIC ACVC 2.0
--
--!
package C974008_0 is -- Automated teller machine abstraction.
-- Flags for testing purposes:
Triggering_Statement_Completed : Boolean := False;
Count : Integer := 1234; -- Global to defeat
-- optimization.
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;
task type ATM_Keyboard_Task is
entry Cancel_Pressed;
end ATM_Keyboard_Task;
procedure Read_Card (Card : in out 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 C974008_0;
--==================================================================--
with Report;
package body C974008_0 is
procedure Listen_For_Input (Key : out Key_Enum) is
begin
-- Simulate the situation where the user presses the cancel key
-- before the card is validated
-- press the cancel key immediately
Key := Cancel;
end Listen_For_Input;
-- One of these gets created as "Keyboard" for each transaction
--
task body ATM_Keyboard_Task is
Key_Pressed : Key_Enum := None;
begin
-- NOTE: Normal usage for this routine would be the loop with
-- the select statement included. This particular test
-- requires that the task be waiting at the accept
-- for the call. To ensure that this is the case the
-- extraneous commands are commented out (we leave them
-- in this form to show the reader the surrounds to the
-- fragment of code remaining)
-- loop
Listen_For_Input (Key_Pressed);
-- select
-- when (Key_Pressed = Cancel) => -- Guard is now
accept Cancel_Pressed do -- true, so accept
Triggering_Statement_Completed := True; -- queued entry
end Cancel_Pressed; -- call.
-- User has cancelled the transaction so we exit the
-- loop and allow the task to terminate
-- exit;
-- else
-- Key_Pressed := None;
-- end select;
-- end loop;
exception
when others =>
Report.Failed ("Unexpected Exception in ATM_Keyboard_Task");
end ATM_Keyboard_Task;
procedure Read_Card (Card : in out ATM_Card_Type) is
begin
Card.Number := 9999;
Card.PIN := 111;
end Read_Card;
procedure Perform_Transaction (Card : in ATM_Card_Type) is
begin
Report.Failed ("Triggering alternative sequence of statements " &
"not executed");
if not Triggering_Statement_Completed then
Report.Failed ("Triggering statement did not complete");
end if;
end Perform_Transaction;
end C974008_0;
--==================================================================--
with Report;
with ImpDef;
with C974008_0; -- Automated teller machine abstraction.
use C974008_0;
procedure C974008 is
Card_Data : ATM_Card_Type;
begin -- Main program.
Report.Test ("C974008", "Asynchronous Select: Trigger is a call to a " &
"waiting task entry and completes immediately");
Read_Card (Card_Data);
declare
-- Create the task for this transaction
Keyboard : C974008_0.ATM_Keyboard_Task;
begin
-- Ensure task is waiting at the accept
-- This is the time required to activate another task and allow it
-- to run to its first accept statement.
--
delay ImpDef.Switch_To_New_Task;
-- --
-- Asynchronous select is tested here --
-- --
select
Keyboard.Cancel_Pressed; -- Entry call is executed immediately
raise Transaction_Canceled; -- This is executed after Validate_Card
-- is aborted.
then abort
-- In other similar tests Validate_Card is called here. In this
-- test we just check to see if the abortable part is called at
-- all. Since the triggering call is not queued the abortable
-- part should not be started
--
Report.Failed ("Abortable part started");
end select;
Perform_Transaction (Card_Data); -- Should not be reached.
exception
when Transaction_Canceled =>
if not Triggering_Statement_Completed then
Report.Failed ("Triggering alternative sequence of statements " &
"executed but triggering statement not complete");
end if;
end;
Report.Result;
end C974008;
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