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1 149 jeremybenn
-- C97201A.ADA
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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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-- CHECK THAT A RENDEZVOUS REQUESTED BY A CONDITIONAL_ENTRY_CALL
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--     IS PERFORMED ONLY IF IMMEDIATELY POSSIBLE.
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-- CASE  A:  THE TASK TO BE CALLED IS NOT YET ACTIVE AS OF THE
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--     MOMENT OF CALL (CONDITIONAL_ENTRY_CALL),
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--     AND THIS FACT CAN BE DETERMINED STATICALLY.
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-- RM 4/20/82
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WITH REPORT; USE REPORT;
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PROCEDURE C97201A IS
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     ELSE_BRANCH_TAKEN    :  INTEGER  :=  3 ;
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BEGIN
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     TEST ("C97201A", "CHECK THAT NO RENDEZVOUS REQUESTED BY"      &
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                      " A CONDITIONAL_ENTRY_CALL CAN OCCUR  WHILE" &
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                      " THE CALLED TASK IS NOT YET ACTIVE"         );
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     -------------------------------------------------------------------
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     DECLARE
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          TASK  T  IS
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               ENTRY  DO_IT_NOW_ORELSE ( AUTHORIZED : IN BOOLEAN ) ;
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          END  T ;
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          TASK BODY  T  IS
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               PACKAGE       SECOND_ATTEMPT  IS    END  SECOND_ATTEMPT ;
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               PACKAGE BODY  SECOND_ATTEMPT  IS
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               BEGIN
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                    SELECT
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                         DO_IT_NOW_ORELSE (FALSE) ;--CALLING (OWN) ENTRY
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                    ELSE    -- (I.E. CALLER ADOPTS A NO-WAIT POLICY)
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                            --      THEREFORE THIS BRANCH MUST BE CHOSEN
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                         ELSE_BRANCH_TAKEN := 2 * ELSE_BRANCH_TAKEN ;
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                         COMMENT( "ELSE_BRANCH  TAKEN  (#2)" );
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                    END SELECT;
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               END  SECOND_ATTEMPT ;
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          BEGIN
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               ACCEPT DO_IT_NOW_ORELSE ( AUTHORIZED : IN BOOLEAN )  DO
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                    IF  AUTHORIZED  THEN
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                         COMMENT(  "AUTHORIZED ENTRY_CALL" );
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                    ELSE
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                         FAILED( "UNAUTHORIZED ENTRY_CALL" );
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                    END IF;
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               END DO_IT_NOW_ORELSE ;
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          END  T ;
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          PACKAGE       FIRST_ATTEMPT  IS      END  FIRST_ATTEMPT ;
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          PACKAGE BODY  FIRST_ATTEMPT  IS
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          BEGIN
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               SELECT
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                    T.DO_IT_NOW_ORELSE (FALSE) ;
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               ELSE        -- (I.E. CALLER ADOPTS A NO-WAIT POLICY)
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                            --      THEREFORE THIS BRANCH MUST BE CHOSEN
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                    ELSE_BRANCH_TAKEN := 1 + ELSE_BRANCH_TAKEN ;
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                    COMMENT( "ELSE_BRANCH  TAKEN  (#1)" );
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               END SELECT;
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          END  FIRST_ATTEMPT ;
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     BEGIN
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          T.DO_IT_NOW_ORELSE ( TRUE );   -- TO SATISFY THE SERVER'S
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                                          --     WAIT FOR SUCH A CALL
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     EXCEPTION
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          WHEN  TASKING_ERROR  =>
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               FAILED( "TASKING ERROR" );
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     END  ;
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     -------------------------------------------------------------------
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     -- BY NOW, THE TASK IS TERMINATED  (AND THE NONLOCALS UPDATED)
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     CASE  ELSE_BRANCH_TAKEN  IS
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          WHEN  3  =>
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               FAILED( "NO 'ELSE'; BOTH (?) RENDEZVOUS ATTEMPTED?" );
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          WHEN  4  =>
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               FAILED( "'ELSE' #1 ONLY; RENDEZVOUS (#2) ATTEMPTED?" );
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          WHEN  6  =>
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               FAILED( "'ELSE' #2 ONLY; RENDEZVOUS (#1) ATTEMPTED?" );
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          WHEN  7  =>
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               FAILED( "WRONG ORDER FOR 'ELSE':  #2,#1 " );
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          WHEN  8  =>
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               NULL ;
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          WHEN  OTHERS  =>
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               FAILED( "WRONG CASE_VALUE" );
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     END CASE;
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     RESULT;
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END  C97201A ;

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