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-- C97201X.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 NO RENDEZVOUS CAN EVER OCCUR IF BOTH PARTNERS REFUSE TO -- WAIT (THAT IS, IF THE ENTRY CALL IS ISSUED BY A -- "CONDITIONAL_ENTRY_CALL" AND THUS FOLLOWS A NO-WAIT POLICY -- (DEMANDING UNCONDITIONALLY THAT "YOU DO IT N O W , OR ELSE"), -- WHILE THE CALLEE IS ALSO COMMITTED TO A NO-WAIT POLICY, -- BY VIRTUE OF A SELECTIVE_WAIT STATEMENT OF THE THIRD KIND -- (WITH AN "ELSE" PART) IN WHICH THE CORRESPONDING ACCEPT_STATEMENT -- IS EMBEDDED). -- ("CLOSE ENCOUNTERS OF THE THIRD KIND" -- ARE THEY POSSIBLE?) -- THE SEMANTICS OF THIS ENTRY CALL REQUIRES THAT THE CALLING TASK -- N O T ENTER ITSELF ON ANY QUEUE BUT RATHER ATTEMPT AN IMMEDIATE -- RENDEZVOUS WHICH IS TO TAKE PLACE IF AND ONLY IF THE CALLED TASK -- HAS REACHED A POINT WHERE IT IS READY TO ACCEPT THE CALL (I.E. -- IT IS EITHER WAITING AT AN ACCEPT STATEMENT FOR THE CORRESPONDING -- ENTRY OR IT IS WAITING AT A SELECTIVE_WAIT STATEMENT WITH AN OPEN -- ALTERNATIVE STARTING WITH SUCH AN ACCEPT STATEMENT). IT ALSO -- REQUIRES THAT THE ENTRY CALL BE CANCELLED IF THE CALLED TASK -- IS NOT AT SUCH A POINT. ON THE OTHER HAND, THE SEMANTICS OF THE -- SELECTIVE_WAIT STATEMENT WITH AN 'ELSE' PART SPECIFIES THAT -- THE 'ELSE' PART MUST BE SELECTED IF NO 'ACCEPT' ALTERNATIVE -- CAN BE IMMEDIATELY SELECTED, AND THAT SUCH AN ALTERNATIVE -- IS DEEMED TO BE IMMEDIATELY SELECTABLE ("SELECTION OF ONE SUCH -- ALTERNATIVE OCCURS IMMEDIATELY"), AND A CORRESPONDING RENDEZVOUS -- POSSIBLE, IF AND ONLY IF THERE IS A CORRESPONDING ENTRY CALL -- W A I T I N G TO BE ACCCEPTED. A "CONDITIONAL ENTRY CALL" -- NEVER WAITS, AND IS NEVER ENTERED IN WAIT QUEUES; IT TAKES -- THE 'ELSE' PART INSTEAD. -- NOTE: IF THIS TEST PROGRAM HANGS UP, THE COMPILER WILL BE DEEMED -- TO HAVE FAILED. -- RM 3/19/82 WITH REPORT; USE REPORT; PROCEDURE C97201X IS RENDEZVOUS_OCCURRED : BOOLEAN := FALSE ; CALLER_TAKES_WRONG_BRANCH : BOOLEAN := TRUE ; SERVER_TAKES_WRONG_BRANCH : BOOLEAN := TRUE ; QUEUE_NOT_EMPTY : BOOLEAN := FALSE ; BEGIN TEST ("C97201X", "CHECK THAT NO RENDEZVOUS CAN EVER OCCUR IF" & " BOTH PARTNERS REFUSE TO WAIT" ); DECLARE TASK T IS ENTRY SYNCHRONIZE ; ENTRY DO_IT_NOW_ORELSE( DID_YOU_DO_IT : IN OUT BOOLEAN); ENTRY KEEP_ALIVE ; END T ; TASK BODY T IS BEGIN ACCEPT SYNCHRONIZE ; IF DO_IT_NOW_ORELSE'COUNT /= 0 THEN QUEUE_NOT_EMPTY := TRUE ; END IF; SELECT ACCEPT DO_IT_NOW_ORELSE ( DID_YOU_DO_IT : IN OUT BOOLEAN ) DO DID_YOU_DO_IT := TRUE ; END ; ELSE -- (I.E. TASK ADOPTS NO-WAIT POLICY) -- 'ELSE' BRANCH MUST THEREFORE BE CHOSEN SERVER_TAKES_WRONG_BRANCH := FALSE ; END SELECT; IF DO_IT_NOW_ORELSE'COUNT /= 0 THEN QUEUE_NOT_EMPTY := TRUE ; END IF; ACCEPT KEEP_ALIVE ; -- TO PREVENT THIS SERVER TASK FROM -- TERMINATING IF IT GETS TO -- THE NO-WAIT MEETING-PLACE -- AHEAD OF THE CALLER (WHICH -- WOULD LEAD TO A SUBSEQUENT -- TASKING_ERROR AT THE TIME OF -- THE NO-WAIT CALL). END T ; BEGIN T.SYNCHRONIZE ; -- TO MINIMIZE THE N E E D TO WAIT SELECT T.DO_IT_NOW_ORELSE ( RENDEZVOUS_OCCURRED ); ELSE -- (I.E. CALLER TOO ADOPTS A NO-WAIT POLICY) -- MUST THEREFORE CHOOSE THIS BRANCH CALLER_TAKES_WRONG_BRANCH := FALSE ; END SELECT; T.KEEP_ALIVE ; -- THIS ALSO UPDATES THE NONLOCALS END; -- END OF BLOCK CONTAINING THE NO-WAIT ENTRY CALL IF RENDEZVOUS_OCCURRED THEN FAILED( "RENDEZVOUS OCCURRED" ); END IF; IF CALLER_TAKES_WRONG_BRANCH OR SERVER_TAKES_WRONG_BRANCH THEN FAILED( "WRONG BRANCH TAKEN" ); END IF; IF QUEUE_NOT_EMPTY THEN FAILED( "ENTRY QUEUE NOT EMPTY" ); END IF; RESULT; END C97201X ;
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