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-- C95021A.ADA

--                             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.

--*

-- CHECK THAT CALLS TO AN ENTRY ARE PLACED IN A FIFO QUEUE.

-- JBG 2/22/84

-- DAS 10/8/90  ADDED PRAGMA PRIORITY TO ENSURE THAT THE FIFO

--              DISCIPLINE MUST BE FOLLOWED (OTHERWISE THE

--              IMPLEMENTATION MIGHT PROHIBIT QUEUES FROM

--              FORMING SO THAT E'COUNT IS ALWAYS ZERO FOR

--              AN ENTRY E).

-- PWN 11/30/94 REMOVED PRAGMA PRIORITY INSTANCES FOR ADA 9X.

-- THE TASK QUEUE IS THE TASK THAT CHECKS THE QUEUEING DISCIPLINE.

--

-- THIS TEST PLACES TWO CALLS ON AN ENTRY, WAITS UNTIL ONE OF THE CALLS

-- IS ACCEPTED, AND THEN PLACES A THIRD CALL ON THE ENTRY.  THE TEST

-- CHECKS THAT THE SECOND CALL IS HANDLED BEFORE THE THIRD.  (IT IS

-- NONDETERMINISTIC WHICH CALL WILL BE THE FIRST ONE ON THE QUEUE, SO

-- THIS MORE COMPLICATED APPROACH IS NECESSARY.)

--

-- THE TASK DISPATCH FIRES UP THE TWO TASKS THAT MAKE THE FIRST TWO

-- CALLS AND THEN WAITS UNTIL QUEUE SAYS IT IS READY FOR THE THIRD CALL.

--

-- THE TASK TYPE CALLERS IS USED TO CREATE TASKS THAT WILL CALL THE

-- ENTRY IN THE TASK QUEUE.

with Impdef;

WITH REPORT; USE REPORT;

WITH SYSTEM;

PROCEDURE C95021A IS

BEGIN

     TEST ("C95021A", "CHECK THAT ENTRY CALLS ARE PUT IN FIFO QUEUES");

-- DO THIS TEST 3 TIMES TO ALLOW FOR RANDOM VARIATIONS IN TIMING.

     FOR I IN 1..3 LOOP

          COMMENT ("ITERATION" & INTEGER'IMAGE(I));

     DECLARE

          TASK TYPE CALLERS IS

               ENTRY NAME (N : NATURAL);

          END CALLERS;

          TASK QUEUE IS

               ENTRY GO;

               ENTRY E1 (NAME : NATURAL);

          END QUEUE;

          TASK DISPATCH IS

               ENTRY READY;

          END DISPATCH;

          TASK BODY CALLERS IS

               MY_NAME : NATURAL;

          BEGIN

-- GET NAME OF THIS TASK OBJECT

               ACCEPT NAME (N : NATURAL) DO

                    MY_NAME := N;

               END NAME;

-- PUT THIS TASK ON QUEUE FOR QUEUE.E1

               QUEUE.E1 (MY_NAME);

          END CALLERS;

          TASK BODY DISPATCH IS

               TYPE ACC_CALLERS IS ACCESS CALLERS;

               OBJ : ACC_CALLERS;

          BEGIN

-- FIRE UP TWO CALLERS FOR QUEUE.E1

               OBJ := NEW CALLERS;

               OBJ.NAME(1);

               OBJ := NEW CALLERS;

               OBJ.NAME(2);

-- ALLOW THESE CALLS TO BE PROCESSED (ONLY ONE WILL BE ACCEPTED).

               QUEUE.GO;

-- WAIT TILL ONE CALL HAS BEEN PROCESSED.

               ACCEPT READY;       -- CALLED FROM QUEUE

-- FIRE UP THIRD CALLER

               OBJ := NEW CALLERS;

               OBJ.NAME(3);

          END DISPATCH;

          TASK BODY QUEUE IS

               NEXT : NATURAL;     -- NUMBER OF SECOND CALLER IN QUEUE.

          BEGIN

-- WAIT UNTIL TWO TASKS CALLING E1 HAVE BEEN ACTIVATED.

               ACCEPT GO;

-- WAIT FOR TWO CALLS TO BE AVAILABLE.  THIS WAIT ASSUMES THAT THE

-- CALLER TASKS WILL PROCEED IF THIS TASK IS EXECUTING A DELAY

-- STATEMENT, ALTHOUGH THIS IS NOT STRICTLY REQUIRED BY THE STANDARD.

               FOR I IN 1..6       -- WILL WAIT FOR ONE MINUTE

               LOOP

                    EXIT WHEN E1'COUNT = 2;

                    DELAY 10.0 * Impdef.One_Second;    -- WAIT FOR CALLS TO ARRIVE

               END LOOP;

               IF E1'COUNT /= 2 THEN

                    FAILED ("CALLER TASKS NOT QUEUED AFTER ONE " &

                            "MINUTE - 1");

               END IF;

-- ASSUMING NO FAILURE, PROCESS ONE OF THE QUEUED CALLS.

               ACCEPT E1 (NAME : NATURAL) DO

-- GET NAME OF NEXT CALLER

                    CASE NAME IS

                         WHEN 1 =>

                              NEXT := 2;

                         WHEN 2 =>

                              NEXT := 1;

                         WHEN OTHERS =>

                              FAILED ("UNEXPECTED ERROR");

                    END CASE;

               END E1;

-- TELL DISPATCH TO FIRE UP NEXT CALLER (ONE IS STILL IN QUEUE).

               DISPATCH.READY;

-- WAIT FOR CALL TO ARRIVE.

               FOR I IN 1..6       -- WILL WAIT FOR ONE MINUTE

               LOOP

                    EXIT WHEN E1'COUNT = 2;

                    DELAY 10.0 * Impdef.One_Second;    -- WAIT FOR CALLS TO ARRIVE

               END LOOP;

               IF E1'COUNT /= 2 THEN

                    FAILED ("CALLER TASKS NOT QUEUED AFTER ONE " &

                            "MINUTE - 2");

               END IF;

-- ASSUMING NO FAILURE, ACCEPT SECOND CALL AND CHECK THAT IT IS FROM THE

-- CORRECT TASK.

               ACCEPT E1 (NAME : NATURAL) DO

                    IF NAME /= NEXT THEN

                         FAILED ("FIFO DISCIPLINE NOT OBEYED");

                    END IF;

               END E1;

-- ACCEPT THE LAST CALLER

               ACCEPT E1 (NAME : NATURAL);

          END QUEUE;

     BEGIN

          NULL;

     END;           -- ALL TASKS NOW TERMINATED.

     END LOOP;

     RESULT;

END C95021A;