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--- C974005.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 Tasking_Error is raised at the point of an entry call
--- which is the triggering statement of an asynchronous select, if
--- the entry call is queued, but the task containing the entry completes
--- before it can be accepted or canceled.
---
--- Check that the abortable part is aborted if it does not complete
--- before the triggering statement completes.
---
--- Check that the sequence of statements of the triggering alternative
--- is not executed.
---
--- TEST DESCRIPTION:
--- Declare a main procedure containing an asynchronous select with a task
--- entry call as triggering statement. Force the entry call to be
--- queued by having the task call a procedure, prior to the corresponding
--- accept statement, which simulates a routine waiting for user input
--- (with a delay).
---
--- Simulate a time-consuming routine in the abortable part by calling a
--- procedure containing an infinite loop. Meanwhile, simulate input by
--- the user (the delay expires) which is NOT the input expected by the
--- guard on the accept statement. The entry remains closed, and the
--- task completes its execution. Since the entry was not accepted before
--- its task completed, Tasking_Error is raised at the point of the entry
--- call.
---
---
--- CHANGE HISTORY:
--- 06 Dec 94 SAIC ACVC 2.0
---
---!
-
-package C974005_0 is -- Automated teller machine abstraction.
-
-
- -- Flags for testing purposes:
-
- Count : Integer := 1234;
-
- 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 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 C974005_0;
-
-
- --==================================================================--
-
-
-with Report;
-with ImpDef;
-
-package body C974005_0 is
-
-
- procedure Listen_For_Input (Key : out Key_Enum) is
- begin
- -- Simulate the situation where a user waits a bit for the card to
- -- be validated, then presses a transaction key (NOT Cancel).
-
- -- Delay long enough to force queuing of Keyboard.Cancel_Pressed.
- delay ImpDef.Clear_Ready_Queue;
-
- if Report.Equal (3, 3) then -- Always true.
- Key := Deposit; -- Cancel is NOT pressed.
- end if;
- end Listen_For_Input;
-
-
- task body ATM_Keyboard_Task is
- Key_Pressed : Key_Enum := None;
- begin
-
- -- Note: no loop. If the user does not press Cancel, the task completes.
- -- In this model of the keyboard monitor, the user only gets one chance
- -- to cancel the card validation.
- -- Force entry
- Listen_For_Input (Key_Pressed); -- calls to be
- -- queued, but do
- -- NOT set guard
- -- to true.
- select
- when (Key_Pressed = Cancel) => -- Guard is false,
- accept Cancel_Pressed do -- so entry call
- Report.Failed ("Accept statement executed"); -- remains queued.
- end Cancel_Pressed;
- else -- Else alternative
- Key_Pressed := None; -- executed, then
- end select; -- task ends.
- 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 Validate_Card (Card : in ATM_Card_Type) is
- begin
- -- Simulate an exceedingly long validation activity.
- loop -- Infinite loop.
- Count := (Count + 1) mod Integer (Card.PIN);
-
- -- Synch Point to allow transfer of control to Keyboard task
- -- during this simulation
- delay ImpDef.Minimum_Task_Switch;
-
- exit when not Report.Equal (Count, Count); -- Always false.
- end loop;
- end Validate_Card;
-
-
- procedure Perform_Transaction (Card : in ATM_Card_Type) is
- begin
- Report.Failed ("Exception not re-raised immediately following " &
- "asynchronous select");
- if Count = 1234 then
- -- Additional analysis added to aid developers
- Report.Failed ("Abortable part did not execute");
- end if;
- end Perform_Transaction;
-
-
-end C974005_0;
-
-
- --==================================================================--
-
-
-with Report;
-
-with C974005_0; -- Automated teller machine abstraction.
-use C974005_0;
-
-procedure C974005 is
-
- Card_Data : ATM_Card_Type;
-
-begin -- Main program.
-
- Report.Test ("C974005", "ATC: trigger is queued but task terminates" &
- " before call is serviced");
-
- Read_Card (Card_Data);
-
- begin
-
- declare
- Keyboard : C974005_0.ATM_Keyboard_Task;
- begin
-
- -- --
- -- Asynchronous select is tested here --
- -- --
-
- select
- Keyboard.Cancel_Pressed; -- Entry call initially queued, so
- -- abortable part starts.
-
- -- Tasking_Error raised here when
- -- Keyboard completes before entry
- -- call can be accepted, and before
- -- abortable part completes.
-
- raise Transaction_Canceled; -- Should not be executed.
- then abort
- Validate_Card (Card_Data); -- Keyboard task completes before
- -- Keyboard.Cancel_Pressed is
- -- accepted, and before this call
- -- finishes. Tasking_Error is raised
- -- at the point of the entry call,
- -- and this call is aborted.
- -- Check that the whole of the abortable part is aborted, not just
- -- the statement in the abortable part that was executing at
- -- the time
- Report.Failed ("Abortable part not aborted");
- end select;
- Perform_Transaction (Card_Data); -- Should not be reached.
- exception
- when Transaction_Canceled =>
- Report.Failed ("Triggering alternative sequence of statements " &
- "executed");
- when Tasking_Error =>
- if Count = 1234 then
- Report.Failed ("Abortable part did not execute");
- end if;
- when others =>
- Report.Failed ("Wrong exception raised");
- end;
-
- exception
- when Tasking_Error =>
- Report.Failed ("Correct exception raised at wrong level");
- when others =>
- Report.Failed ("Wrong exception raised at wrong level");
- end;
-
- Report.Result;
-
-end C974005;