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-- C97120B.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 IF A SPECIFIED DELAY IS ZERO OR NEGATIVE AND AN ENTRY CALL

-- IS WAITING AT AN OPEN ALTERNATIVE WHEN THE SELECTIVE WAIT IS

-- EXECUTED, THE CALL IS ACCEPTED.

-- WRG 7/11/86

with Impdef;

WITH REPORT; USE REPORT;

PROCEDURE C97120B IS

     ZERO, NEG : DURATION := 1.0;

BEGIN

     TEST ("C97120B", "CHECK THAT IF A SPECIFIED DELAY IS ZERO OR " &

                      "NEGATIVE AND AN ENTRY CALL IS WAITING AT AN " &

                      "OPEN ALTERNATIVE WHEN THE SELECTIVE WAIT IS " &

                      "EXECUTED, THE CALL IS ACCEPTED");

     IF EQUAL (3, 3) THEN

          ZERO :=  0.0;

          NEG  := -1.0;

     END IF;

     DECLARE

          TASK T IS

               ENTRY E;

          END T;

          TASK BODY T IS

          BEGIN

               WHILE E'COUNT = 0 LOOP

                    DELAY 1.0 * Impdef.One_Second;

               END LOOP;

            A: BEGIN

                    SELECT

                         WHEN IDENT_BOOL (TRUE) =>

                              ACCEPT E;

                    OR

                         DELAY ZERO * Impdef.One_Second;

                         FAILED ("ZERO DELAY ALTERNATIVE TAKEN");

                         ACCEPT E;

                    END SELECT;

               EXCEPTION

                    WHEN OTHERS =>

                         FAILED ("EXCEPTION RAISED (A)");

               END A;

               WHILE E'COUNT = 0 LOOP

                    DELAY 1.0 * Impdef.One_Second;

               END LOOP;

            B: BEGIN

                    SELECT

                         ACCEPT E;

                    OR

                         DELAY NEG;

                         FAILED ("NEGATIVE DELAY ALTERNATIVE TAKEN");

                         ACCEPT E;

                    END SELECT;

               EXCEPTION

                    WHEN OTHERS =>

                         FAILED ("EXCEPTION RAISED (B)");

               END B;

          END T;

     BEGIN

          T.E;

          T.E;

     END;

     RESULT;

END C97120B;