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-- C954020.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 a call to a protected entry can be requeued to a task
-- entry. Check that the requeue is placed on the correct entry; that the
-- original caller waits for the completion of the requeue and continues
-- after the requeued rendezvous. Check that the requeue does not block.
-- Specifically, check a requeue with abort from a protected entry to
-- an entry in a task.
--
-- TEST DESCRIPTION:
--
-- In the Distributor protected object, requeue two successive calls on
-- the entries of two separate target tasks. Each task in each of the
-- paths adds identifying information in the transaction being passed.
-- This information is checked by the Message tasks on completion
-- ensuring that the requeues have been placed on the correct queues.
-- There is an artificial guard on the Credit Task to ensure that the
-- input is queued; this guard is released by the Debit task which
-- handles its input immediately. This ensures that we have one of the
-- requeued items actually queued for later handling and also verifies
-- that the requeuing process (in the protected object) is not blocked.
--
-- This series of tests uses a simulation of a transaction driven
-- processing system. Line Drivers accept input from an external source
-- and build them into transaction records. These records are then
-- encapsulated in message tasks which remain extant for the life of the
-- transaction in the system. The message tasks put themselves on the
-- input queue of a Distributor object which, from information in the
-- transaction and/or system load conditions forwards them to other
-- operating tasks. These in turn might forward the transactions to yet
-- other tasks for further action. The routing is, in real life,
-- dynamic and unpredictable at the time of message generation. All
-- rerouting in this model is done by means of requeues.
--
--
-- CHANGE HISTORY:
-- 06 Dec 94 SAIC ACVC 2.0
-- 06 Nov 95 SAIC Fixed problems for ACVC 2.0.1
--
--!
with Report;
with ImpDef;
procedure C954020 is
Verbose : constant Boolean := False;
-- Arbitrary test values
Credit_Return : constant := 1;
Debit_Return : constant := 2;
protected type Message_Status is
procedure Set_Complete;
function Complete return Boolean;
private
Is_Complete : Boolean := False;
end Message_Status;
protected body Message_Status is
procedure Set_Complete is
begin
Is_Complete := True;
end Set_Complete;
function Complete return Boolean is
begin
return Is_Complete;
end Complete;
end Message_Status;
TC_Debit_Message : Message_Status;
TC_Credit_Message : Message_Status;
type Transaction_Code is (Credit, Debit);
type Transaction_Record;
type acc_Transaction_Record is access Transaction_Record;
type Transaction_Record is
record
ID : integer := 0;
Code : Transaction_Code := Debit;
Account_Number : integer := 0;
Stock_Number : integer := 0;
Quantity : integer := 0;
Return_Value : integer := 0;
TC_Message_Count : integer := 0;
TC_Thru_Dist : Boolean := false;
end record;
task type Message_Task is
entry Accept_Transaction (In_Transaction : acc_Transaction_Record);
end Message_Task;
type acc_Message_Task is access Message_Task;
task Line_Driver is
entry Start;
end Line_Driver;
task Credit_Computation is
entry Input(Transaction : acc_Transaction_Record);
end Credit_Computation;
task Debit_Computation is
entry Input(Transaction : acc_Transaction_Record);
end Debit_Computation;
protected Time_Lock is
procedure Credit_Start;
function Credit_Enabled return Boolean;
private
Credit_OK : Boolean := false;
end Time_Lock;
protected body Time_Lock is
procedure Credit_Start is
begin
Credit_OK := true;
end Credit_Start;
function Credit_Enabled return Boolean is
begin
return Credit_OK;
end Credit_Enabled;
end Time_Lock;
protected Distributor is
entry Input (Transaction : acc_Transaction_Record);
end Distributor;
--
--
-- Dispose each input Transaction_Record to the appropriate
-- computation tasks
--
protected body Distributor is
entry Input (Transaction : acc_Transaction_Record) when true is
-- barrier is always open
begin
-- Test Control: Set the indicator in the message to show it has
-- passed through the Distributor object
Transaction.TC_thru_Dist := true;
-- Pass this transaction on to the appropriate computation
-- task
case Transaction.Code is
when Credit =>
requeue Credit_Computation.Input with abort;
when Debit =>
requeue Debit_Computation.Input with abort;
end case;
end Input;
end Distributor;
-- Assemble messages received from an external source
-- Creates a message task for each. The message tasks remain extant
-- for the life of the messages in the system.
-- The Line Driver task would normally be designed to loop continuously
-- creating the messages as input is received. Simulate this
-- but limit it to two dummy messages for this test and allow it
-- to terminate at that point
--
task body Line_Driver is
Current_ID : integer := 1;
TC_Last_was_for_credit : Boolean := false;
procedure Build_Credit_Record
( Next_Transaction : acc_Transaction_Record ) is
Dummy_Account : constant integer := 100;
begin
Next_Transaction.ID := Current_ID;
Next_Transaction.Code := Credit;
Next_Transaction.Account_Number := Dummy_Account;
Current_ID := Current_ID + 1;
end Build_Credit_Record;
procedure Build_Debit_Record
( Next_Transaction : acc_Transaction_Record ) is
Dummy_Account : constant integer := 200;
begin
Next_Transaction.ID := Current_ID;
Next_Transaction.Code := Debit;
Next_Transaction.Account_Number := Dummy_Account;
Current_ID := Current_ID + 1;
end Build_Debit_Record;
begin
accept Start; -- Wait for trigger from Main
for i in 1..2 loop -- arbitrarily limit to two messages for the test
declare
-- Create a task for the next message
Next_Message_Task : acc_Message_Task := new Message_Task;
-- Create a record for it
Next_Transaction : acc_Transaction_Record
:= new Transaction_Record;
begin
if TC_Last_was_for_credit then
Build_Debit_Record ( Next_Transaction );
else
Build_Credit_Record( Next_Transaction );
TC_Last_was_for_credit := true;
end if;
Next_Message_Task.Accept_Transaction ( Next_Transaction );
end; -- declare
end loop;
exception
when others =>
Report.Failed ("Unexpected exception in Line_Driver");
end Line_Driver;
task body Message_Task is
TC_Original_Transaction_Code : Transaction_Code;
This_Transaction : acc_Transaction_Record := new Transaction_Record;
begin
accept Accept_Transaction (In_Transaction : acc_Transaction_Record) do
This_Transaction.all := In_Transaction.all;
end Accept_Transaction;
if Verbose then
Report.Comment ("message task got " &
Transaction_Code'Image (This_Transaction.Code));
end if;
-- Note the original code to ensure correct return
TC_Original_Transaction_Code := This_Transaction.Code;
-- Queue up on Distributor's Input queue
Distributor.Input ( This_Transaction );
-- This task will now wait for the requeued rendezvous
-- to complete before proceeding
-- After the required computations have been performed
-- return the Transaction_Record appropriately (probably to an output
-- line driver)
null; -- stub
-- The following is all Test Control Code
-- Check that the return values are as expected
if TC_Original_Transaction_Code /= This_Transaction.Code then
-- Incorrect rendezvous
Report.Failed ("Message Task: Incorrect code returned");
end if;
if This_Transaction.Code = Credit then
if This_Transaction.Return_Value /= Credit_Return or
This_Transaction.TC_Message_Count /= 1 or
not This_Transaction.TC_thru_Dist then
Report.Failed ("Expected path not traversed");
end if;
TC_Credit_Message.Set_Complete;
else
if This_Transaction.Return_Value /= Debit_Return or
This_Transaction.TC_Message_Count /= 1 or
not This_Transaction.TC_thru_Dist then
Report.Failed ("Expected path not traversed");
end if;
TC_Debit_Message.Set_Complete;
end if;
exception
when others =>
Report.Failed ("Unexpected exception in Message_Task");
end Message_Task;
-- Computation task.
-- Note: After the computation is performed in this task and the
-- accept body is completed the rendezvous in the original
-- message task is completed.
--
task body Credit_Computation is
Message_Count : integer := 0;
begin
loop
select
when Time_Lock.Credit_enabled =>
accept Input ( Transaction : acc_Transaction_Record) do
-- Perform the computations required for this transaction
null; -- stub
if Verbose then
Report.Comment ("Credit_Computation in accept");
end if;
-- For the test:
if not Transaction.TC_thru_Dist then
Report.Failed
("Credit Task: Wrong queue, Distributor bypassed");
end if;
if Transaction.code /= Credit then
Report.Failed
("Credit Task: Requeue delivered to the wrong queue");
end if;
-- for the test plug a known value and count
Transaction.Return_Value := Credit_Return;
-- one, and only one message should pass through
Message_Count := Message_Count + 1;
Transaction.TC_Message_Count := Message_Count;
end Input;
exit; -- only handle 1 transaction
else
-- poll until we can accept credit transaction
delay ImpDef.Clear_Ready_Queue;
end select;
end loop;
exception
when others =>
Report.Failed ("Unexpected exception in Credit_Computation");
end Credit_Computation;
-- Computation task.
-- Note: After the computation is performed in this task and the
-- accept body is completed the rendezvous in the original
-- message task is completed.
--
task body Debit_Computation is
Message_Count : integer := 0;
begin
loop
select
accept Input (Transaction : acc_Transaction_Record) do
-- Perform the computations required for this message
null; -- stub
if Verbose then
Report.Comment ("Debit_Computation in accept");
end if;
-- For the test:
if not Transaction.TC_thru_Dist then
Report.Failed
("Debit Task: Wrong queue, Distributor bypassed");
end if;
if Transaction.code /= Debit then
Report.Failed
("Debit Task: Requeue delivered to the wrong queue");
end if;
-- for the test plug a known value and count
Transaction.Return_Value := Debit_Return;
-- one, and only one, message should pass through
Message_Count := Message_Count + 1;
Transaction.TC_Message_Count := Message_Count;
-- for the test: once we have completed the only Debit
-- message release the Credit Messages which are queued
-- on the Credit Input queue
Time_Lock.Credit_Start;
end Input;
or
terminate;
end select;
end loop;
exception
when others =>
Report.Failed ("Unexpected exception in Debit_Computation");
end Debit_Computation;
begin -- C954020
Report.Test ("C954020", "Requeue, with abort, from protected entry " &
"to task entry");
Line_Driver.Start; -- Start the test
-- Ensure that the message tasks complete before reporting the result
while not (TC_Credit_Message.Complete and TC_Debit_Message.Complete) loop
delay ImpDef.Minimum_Task_Switch;
end loop;
Report.Result;
end C954020;