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