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jeremybenn |
-- C954015.A
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--
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-- Grant of Unlimited Rights
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--
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-- Under contracts F33600-87-D-0337, F33600-84-D-0280, MDA903-79-C-0687,
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-- F08630-91-C-0015, and DCA100-97-D-0025, the U.S. Government obtained
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-- unlimited rights in the software and documentation contained herein.
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-- Unlimited rights are defined in DFAR 252.227-7013(a)(19). By making
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-- this public release, the Government intends to confer upon all
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-- recipients unlimited rights equal to those held by the Government.
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-- These rights include rights to use, duplicate, release or disclose the
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-- released technical data and computer software in whole or in part, in
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-- any manner and for any purpose whatsoever, and to have or permit others
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-- to do so.
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--
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-- DISCLAIMER
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--
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-- ALL MATERIALS OR INFORMATION HEREIN RELEASED, MADE AVAILABLE OR
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-- DISCLOSED ARE AS IS. THE GOVERNMENT MAKES NO EXPRESS OR IMPLIED
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-- WARRANTY AS TO ANY MATTER WHATSOEVER, INCLUDING THE CONDITIONS OF THE
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-- SOFTWARE, DOCUMENTATION OR OTHER INFORMATION RELEASED, MADE AVAILABLE
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-- OR DISCLOSED, OR THE OWNERSHIP, MERCHANTABILITY, OR FITNESS FOR A
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-- PARTICULAR PURPOSE OF SAID MATERIAL.
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--*
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--
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-- OBJECTIVE:
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-- Check that requeued calls to task entries may, in turn, be requeued.
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-- Check that the intermediate requeues are not blocked and that the
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-- original caller remains blocked until the last requeue is complete.
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-- This test uses:
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-- Call with parameters
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-- Requeue with abort
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--
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-- TEST DESCRIPTION
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-- A call is placed on the input queue of the Distributor. The
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-- Distributor requeues to the Credit task; the Credit task requeues to a
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-- secondary task which, in turn requeues to yet another task. This
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-- continues down the chain. At the furthest point of the chain the
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-- rendezvous is completed. To verify the action, the furthest task
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-- waits in the accept statement for a second message to arrive before
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-- completing. This second message can only arrive if none of the earlier
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-- tasks in the chain are blocked waiting for completion. Apart from
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-- the two Credit messages which are used to check the requeue chain one
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-- Debit message is sent to validate the mix.
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--
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--
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-- This series of tests uses a simulation of a transaction driven
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-- processing system. Line Drivers accept input from an external source
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-- and build them into transaction records. These records are then
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-- encapsulated in message tasks which remain extant for the life of the
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-- transaction in the system. The message tasks put themselves on the
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-- input queue of a Distributor which, from information in the
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-- transaction and/or system load conditions forwards them to other
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-- operating tasks. These in turn might forward the transactions to yet
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-- other tasks for further action. The routing is, in real life, dynamic
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-- and unpredictable at the time of message generation. All rerouting in
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-- this model is done by means of requeues.
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--
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--
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-- CHANGE HISTORY:
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-- 06 Dec 94 SAIC ACVC 2.0
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--
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--!
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with Report;
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with ImpDef;
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procedure C954015 is
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-- Arbitrary test values
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Credit_Return : constant := 1;
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Debit_Return : constant := 2;
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-- Mechanism to count the number of Credit Message tasks completed
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protected TC_Tasks_Completed is
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procedure Increment;
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function Count return integer;
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private
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Number_Complete : integer := 0;
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end TC_Tasks_Completed;
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TC_Expected_To_Complete : constant integer := 3;
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-- Values added to the Return_Value indicating passage through the
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-- particular task
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TC_Credit_Value : constant integer := 1;
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TC_Sub_1_Value : constant integer := 2;
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TC_Sub_2_Value : constant integer := 3;
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TC_Sub_3_Value : constant integer := 4;
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TC_Sub_4_Value : constant integer := 5;
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--
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TC_Full_Value : integer := TC_Credit_Value + TC_Sub_1_Value +
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TC_Sub_2_Value + TC_Sub_3_Value +
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TC_Sub_4_Value;
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type Transaction_Code is (Credit, Debit);
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type Transaction_Record;
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type acc_Transaction_Record is access Transaction_Record;
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type Transaction_Record is
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record
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ID : integer := 0;
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Code : Transaction_Code := Debit;
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Account_Number : integer := 0;
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Stock_Number : integer := 0;
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Quantity : integer := 0;
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Return_Value : integer := 0;
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TC_Message_Count : integer := 0;
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TC_Thru_Distrib : Boolean := false;
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end record;
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task type Message_Task is
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entry Accept_Transaction (In_Transaction : acc_Transaction_Record);
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end Message_Task;
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type acc_Message_Task is access Message_Task;
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task Line_Driver is
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entry Start;
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end Line_Driver;
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task Distributor is
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entry Input(Transaction : acc_Transaction_Record);
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end Distributor;
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task Credit_Computation is
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entry Input(Transaction : acc_Transaction_Record);
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end Credit_Computation;
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task Debit_Computation is
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entry Input(Transaction : acc_Transaction_Record);
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end Debit_Computation;
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-- The following are almost identical for the purpose of the test
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task Credit_Sub_1 is
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entry Input(Transaction : acc_Transaction_Record);
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end Credit_Sub_1;
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--
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task Credit_Sub_2 is
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entry Input(Transaction : acc_Transaction_Record);
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end Credit_Sub_2;
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--
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task Credit_Sub_3 is
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entry Input(Transaction : acc_Transaction_Record);
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end Credit_Sub_3;
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-- This is the last in the chain
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task Credit_Sub_4 is
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entry Input(Transaction : acc_Transaction_Record);
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end Credit_Sub_4;
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-- Mechanism to count the number of Message tasks completed (Credit)
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protected body TC_Tasks_Completed is
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procedure Increment is
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begin
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Number_Complete := Number_Complete + 1;
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end Increment;
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function Count return integer is
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begin
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return Number_Complete;
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end Count;
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end TC_Tasks_Completed;
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-- Assemble messages received from an external source
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-- Creates a message task for each. The message tasks remain extant
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-- for the life of the messages in the system.
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-- The Line Driver task would normally be designed to loop continuously
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-- creating the messages as input is received. Simulate this
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-- but limit it to the number of dummy messages needed for this
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-- test and allow it to terminate at that point.
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--
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task body Line_Driver is
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Current_ID : integer := 1;
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TC_Last_was_for_credit : Boolean := false;
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-- Arbitrary limit for the number of messages sent for this test
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type TC_Trans_Range is range 1..3;
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procedure Build_Credit_Record
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( Next_Transaction : acc_Transaction_Record ) is
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Dummy_Account : constant integer := 100;
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begin
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Next_Transaction.ID := Current_ID;
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Next_Transaction.Code := Credit;
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Next_Transaction.Account_Number := Dummy_Account;
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Current_ID := Current_ID + 1;
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end Build_Credit_Record;
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procedure Build_Debit_Record
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( Next_Transaction : acc_Transaction_Record ) is
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Dummy_Account : constant integer := 200;
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begin
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Next_Transaction.ID := Current_ID;
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Next_Transaction.Code := Debit;
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Next_Transaction.Account_Number := Dummy_Account;
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Current_ID := Current_ID + 1;
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end Build_Debit_Record;
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begin
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accept Start; -- wait for trigger from Main
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-- Arbitrarily limit the loop to the number needed for this test only
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for Transaction_Numb in TC_Trans_Range loop
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declare
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-- Create a task for the next message
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Next_Message_Task : acc_Message_Task := new Message_Task;
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-- Create a record for it
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Next_Transaction : acc_Transaction_Record :=
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new Transaction_Record;
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begin
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-- Artificially send out in the order required
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case Transaction_Numb is
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when 1 =>
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Build_Credit_Record( Next_Transaction );
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when 2 =>
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Build_Credit_Record( Next_Transaction );
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when 3 =>
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Build_Debit_Record ( Next_Transaction );
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end case;
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-- Present the record to the message task
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Next_Message_Task.Accept_Transaction ( Next_Transaction );
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end; -- declare
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end loop;
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exception
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when others =>
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Report.Failed ("Unexpected exception in Line_Driver");
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end Line_Driver;
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task body Message_Task is
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TC_Original_Transaction_Code : Transaction_Code;
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This_Transaction : acc_Transaction_Record := new Transaction_Record;
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begin
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accept Accept_Transaction (In_Transaction : acc_Transaction_Record) do
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This_Transaction.all := In_Transaction.all;
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end Accept_Transaction;
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-- Note the original code to ensure correct return
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TC_Original_Transaction_Code := This_Transaction.Code;
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-- Queue up on Distributor's Input queue
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Distributor.Input ( This_Transaction );
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-- This task will now wait for the requeued rendezvous
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-- to complete before proceeding
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-- After the required computations have been performed
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-- return the Transaction_Record appropriately (probably to an output
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-- line driver)
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null; -- stub
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-- The following is all Test Control Code
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-- Check that the return values are as expected
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if TC_Original_Transaction_Code /= This_Transaction.Code then
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-- Incorrect rendezvous
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Report.Failed ("Message Task: Incorrect code returned");
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end if;
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if This_Transaction.Code = Credit then
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if This_Transaction.Return_Value /= TC_Full_Value or not
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This_Transaction.TC_Thru_Distrib then
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Report.Failed ("Expected path not traversed - CR");
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end if;
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if
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This_Transaction.TC_Message_Count not in 1..2 then
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Report.Failed ("Incorrect Message Count");
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end if;
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else
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if This_Transaction.Return_Value /= Debit_Return or
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This_Transaction.TC_Message_Count /= 1 or not
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This_Transaction.TC_Thru_Distrib then
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Report.Failed ("Expected path not traversed - DB");
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end if;
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end if;
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TC_Tasks_Completed.Increment;
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exception
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when others =>
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Report.Failed ("Unexpected exception in Message_Task");
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end Message_Task;
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-- Dispose each input Transaction_Record to the appropriate
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-- computation tasks
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--
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task body Distributor is
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begin
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loop
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select
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accept Input (Transaction : acc_Transaction_Record) do
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-- Show that the message did pass through the Distributor Task
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Transaction.TC_Thru_Distrib := true;
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-- Pass this transaction on to the appropriate computation
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-- task
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case Transaction.Code is
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when Credit =>
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requeue Credit_Computation.Input with abort;
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when Debit =>
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requeue Debit_Computation.Input with abort;
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end case;
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end Input;
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or
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terminate;
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end select;
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end loop;
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exception
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when others =>
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Report.Failed ("Unexpected exception in Distributor");
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end Distributor;
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-- Computation task.
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-- Note: After the computation is performed in this task the message is
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-- passed on for further processing to some subsidiary task. The choice
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-- of subsidiary task is made according to criteria not specified in
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-- this test.
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--
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task body Credit_Computation is
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Message_Count : integer := 0;
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begin
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loop
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select
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accept Input ( Transaction : acc_Transaction_Record) do
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-- Perform the computations required for this transaction
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null; -- stub
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-- For the test:
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if not Transaction.TC_Thru_Distrib then
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Report.Failed
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("Credit Task: Wrong queue, Distributor bypassed");
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end if;
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if Transaction.code /= Credit then
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Report.Failed
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("Credit Task: Requeue delivered to the wrong queue");
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end if;
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-- for the test, plug a known value and count
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Transaction.Return_Value := TC_Credit_Value;
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Message_Count := Message_Count + 1;
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Transaction.TC_Message_Count := Message_Count;
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-- Depending on transaction content send it on to the
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-- some other task for further processing
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-- TC: Arbitrarily send the message on to Credit_Sub_1
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requeue Credit_Sub_1.Input with abort;
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end Input;
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or
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terminate;
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end select;
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end loop;
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exception
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when others =>
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Report.Failed ("Unexpected exception in Credit_Computation");
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end Credit_Computation;
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task body Credit_Sub_1 is
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begin
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381 |
|
|
loop
|
382 |
|
|
select
|
383 |
|
|
accept Input(Transaction : acc_Transaction_Record) do
|
384 |
|
|
-- Process this transaction
|
385 |
|
|
null; -- stub
|
386 |
|
|
|
387 |
|
|
-- Add the value showing passage through this task
|
388 |
|
|
Transaction.Return_Value :=
|
389 |
|
|
Transaction.Return_Value + TC_Sub_1_Value;
|
390 |
|
|
-- Depending on transaction content send it on to the
|
391 |
|
|
-- some other task for further processing
|
392 |
|
|
-- Arbitrarily send the message on to Credit_Sub_2
|
393 |
|
|
requeue Credit_Sub_2.Input with abort;
|
394 |
|
|
end Input;
|
395 |
|
|
or
|
396 |
|
|
terminate;
|
397 |
|
|
end select;
|
398 |
|
|
end loop;
|
399 |
|
|
exception
|
400 |
|
|
when others =>
|
401 |
|
|
Report.Failed ("Unexpected exception in Credit_Sub_1");
|
402 |
|
|
|
403 |
|
|
end Credit_Sub_1;
|
404 |
|
|
|
405 |
|
|
task body Credit_Sub_2 is
|
406 |
|
|
begin
|
407 |
|
|
loop
|
408 |
|
|
select
|
409 |
|
|
accept Input(Transaction : acc_Transaction_Record) do
|
410 |
|
|
-- Process this transaction
|
411 |
|
|
null; -- stub
|
412 |
|
|
|
413 |
|
|
-- Add the value showing passage through this task
|
414 |
|
|
Transaction.Return_Value :=
|
415 |
|
|
Transaction.Return_Value + TC_Sub_2_Value;
|
416 |
|
|
-- Depending on transaction content send it on to the
|
417 |
|
|
-- some other task for further processing
|
418 |
|
|
-- Arbitrarily send the message on to Credit_Sub_3
|
419 |
|
|
requeue Credit_Sub_3.Input with abort;
|
420 |
|
|
end Input;
|
421 |
|
|
or
|
422 |
|
|
terminate;
|
423 |
|
|
end select;
|
424 |
|
|
end loop;
|
425 |
|
|
exception
|
426 |
|
|
when others =>
|
427 |
|
|
Report.Failed ("Unexpected exception in Credit_Sub_2");
|
428 |
|
|
end Credit_Sub_2;
|
429 |
|
|
|
430 |
|
|
task body Credit_Sub_3 is
|
431 |
|
|
begin
|
432 |
|
|
loop
|
433 |
|
|
select
|
434 |
|
|
accept Input(Transaction : acc_Transaction_Record) do
|
435 |
|
|
-- Process this transaction
|
436 |
|
|
null; -- stub
|
437 |
|
|
|
438 |
|
|
-- Add the value showing passage through this task
|
439 |
|
|
Transaction.Return_Value :=
|
440 |
|
|
Transaction.Return_Value + TC_Sub_3_Value;
|
441 |
|
|
-- Depending on transaction content send it on to the
|
442 |
|
|
-- some other task for further processing
|
443 |
|
|
-- Arbitrarily send the message on to Credit_Sub_4
|
444 |
|
|
requeue Credit_Sub_4.Input with abort;
|
445 |
|
|
end Input;
|
446 |
|
|
or
|
447 |
|
|
terminate;
|
448 |
|
|
end select;
|
449 |
|
|
end loop;
|
450 |
|
|
exception
|
451 |
|
|
when others =>
|
452 |
|
|
Report.Failed ("Unexpected exception in Credit_Sub_3");
|
453 |
|
|
end Credit_Sub_3;
|
454 |
|
|
|
455 |
|
|
-- This is the last in the chain of tasks to which transactions will
|
456 |
|
|
-- be requeued
|
457 |
|
|
--
|
458 |
|
|
task body Credit_Sub_4 is
|
459 |
|
|
|
460 |
|
|
TC_First_Message : Boolean := true;
|
461 |
|
|
|
462 |
|
|
begin
|
463 |
|
|
loop
|
464 |
|
|
select
|
465 |
|
|
accept Input(Transaction : acc_Transaction_Record) do
|
466 |
|
|
-- Process this transaction
|
467 |
|
|
null; -- stub
|
468 |
|
|
|
469 |
|
|
-- Add the value showing passage through this task
|
470 |
|
|
Transaction.Return_Value :=
|
471 |
|
|
Transaction.Return_Value + TC_Sub_4_Value;
|
472 |
|
|
-- TC: stay in the accept body dealing with the first message
|
473 |
|
|
-- until the second arrives. If any of the requeues are
|
474 |
|
|
-- blocked the test will hang here indicating failure
|
475 |
|
|
if TC_First_Message then
|
476 |
|
|
while Input'count = 0 loop
|
477 |
|
|
delay ImpDef.Minimum_Task_Switch;
|
478 |
|
|
end loop;
|
479 |
|
|
TC_First_Message := false;
|
480 |
|
|
end if;
|
481 |
|
|
-- for the second message, just complete the rendezvous
|
482 |
|
|
end Input;
|
483 |
|
|
or
|
484 |
|
|
terminate;
|
485 |
|
|
end select;
|
486 |
|
|
end loop;
|
487 |
|
|
exception
|
488 |
|
|
when others =>
|
489 |
|
|
Report.Failed ("Unexpected exception in Credit_Sub_4");
|
490 |
|
|
end Credit_Sub_4;
|
491 |
|
|
|
492 |
|
|
|
493 |
|
|
|
494 |
|
|
-- Computation task.
|
495 |
|
|
-- Note: After the computation is performed in this task and the
|
496 |
|
|
-- accept body is completed the rendezvous in the original
|
497 |
|
|
-- message task is completed.
|
498 |
|
|
--
|
499 |
|
|
task body Debit_Computation is
|
500 |
|
|
Message_Count : integer := 0;
|
501 |
|
|
begin
|
502 |
|
|
loop
|
503 |
|
|
select
|
504 |
|
|
accept Input (Transaction : acc_Transaction_Record) do
|
505 |
|
|
-- Perform the computations required for this message
|
506 |
|
|
null; -- stub
|
507 |
|
|
|
508 |
|
|
-- For the test:
|
509 |
|
|
if not Transaction.TC_Thru_Distrib then
|
510 |
|
|
Report.Failed
|
511 |
|
|
("Debit Task: Wrong queue, Distributor bypassed");
|
512 |
|
|
end if;
|
513 |
|
|
if Transaction.code /= Debit then
|
514 |
|
|
Report.Failed
|
515 |
|
|
("Debit Task: Requeue delivered to the wrong queue");
|
516 |
|
|
end if;
|
517 |
|
|
|
518 |
|
|
-- for the test plug a known value and count
|
519 |
|
|
Transaction.Return_Value := Debit_Return;
|
520 |
|
|
-- one, and only one, message should pass through
|
521 |
|
|
Message_Count := Message_Count + 1;
|
522 |
|
|
Transaction.TC_Message_Count := Message_Count;
|
523 |
|
|
end Input;
|
524 |
|
|
or
|
525 |
|
|
terminate;
|
526 |
|
|
end select;
|
527 |
|
|
end loop;
|
528 |
|
|
exception
|
529 |
|
|
when others =>
|
530 |
|
|
Report.Failed ("Unexpected exception in Debit_Computation");
|
531 |
|
|
|
532 |
|
|
|
533 |
|
|
end Debit_Computation;
|
534 |
|
|
|
535 |
|
|
|
536 |
|
|
begin
|
537 |
|
|
|
538 |
|
|
Report.Test ("C954015", "Test multiple levels of requeue to task entry");
|
539 |
|
|
|
540 |
|
|
Line_Driver.Start; -- Start the test
|
541 |
|
|
|
542 |
|
|
-- Ensure that the message tasks completed before calling Result
|
543 |
|
|
while (TC_Tasks_Completed.Count < TC_Expected_To_Complete) loop
|
544 |
|
|
delay ImpDef.Minimum_Task_Switch;
|
545 |
|
|
end loop;
|
546 |
|
|
|
547 |
|
|
Report.Result;
|
548 |
|
|
|
549 |
|
|
end C954015;
|