| -- 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; |
