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-- C97114A.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 WHETHER A DELAY EXPRESSION FOLLOWING AN OPEN GUARD IS EVALUATED
-- DIRECTLY AFTER THE GUARD OR ONLY AFTER ALL GUARDS HAVE BEEN
-- EVALUATED, OR IN SOME MIXED ORDER SUCH THAT DELAY EXPRESSIONS ARE
-- EVALUATED AFTER THEIR GUARDS ARE DETERMINED TO BE OPEN.
-- RM 5/10/82
-- SPS 11/21/82
-- JBG 10/24/83
-- PWN 09/11/94 REMOVED PRAGMA PRIORITY FOR ADA 9X.
with Impdef;
WITH REPORT; USE REPORT;
WITH SYSTEM; USE SYSTEM;
PROCEDURE C97114A IS
-- THE TASK WILL HAVE LAST PRIORITY ( PRIORITY'FIRST )
EVAL_ORDER : STRING (1..6) := ( 1..6 => '*' );
EVAL_ORD : STRING (1..6) := ( 1..6 => '*' );
INDEX : INTEGER := 0;
DUMMY : INTEGER := 0;
FUNCTION F1 (X:INTEGER) RETURN INTEGER IS
BEGIN
INDEX := INDEX + 1;
EVAL_ORDER (INDEX) := 'F'; -- 123: FGH
EVAL_ORD (INDEX) := 'G'; -- 123: GGG ( 'G' FOR 'GUARD' )
RETURN ( IDENT_INT(7) );
END F1;
FUNCTION F2 (X:INTEGER) RETURN INTEGER IS
BEGIN
INDEX := INDEX + 1;
EVAL_ORDER (INDEX) := 'G';
EVAL_ORD (INDEX) := 'G';
RETURN ( IDENT_INT(7) );
END F2;
FUNCTION F3 (X:INTEGER) RETURN INTEGER IS
BEGIN
INDEX := INDEX + 1;
EVAL_ORDER (INDEX) := 'H';
EVAL_ORD (INDEX) := 'G';
RETURN ( IDENT_INT(7) );
END F3;
FUNCTION D1( X:INTEGER ) RETURN DURATION IS
BEGIN
INDEX := INDEX + 1;
EVAL_ORDER (INDEX) := 'A'; -- 123: ABC
EVAL_ORD (INDEX) := 'D'; -- 123: DDD ( 'D' FOR 'DELAY' )
RETURN ( 1.0 );
END D1;
FUNCTION D2( X:INTEGER ) RETURN DURATION IS
BEGIN
INDEX := INDEX + 1;
EVAL_ORDER (INDEX) := 'B';
EVAL_ORD (INDEX) := 'D';
RETURN ( 2.0 );
END D2;
FUNCTION D3( X:INTEGER ) RETURN DURATION IS
BEGIN
INDEX := INDEX + 1;
EVAL_ORDER (INDEX) := 'C';
EVAL_ORD (INDEX) := 'D';
RETURN ( 3.0 );
END D3;
FUNCTION POS_OF (FUNC : CHARACTER) RETURN INTEGER IS
BEGIN
FOR I IN EVAL_ORDER'RANGE LOOP
IF EVAL_ORDER(I) = FUNC THEN
RETURN I;
END IF;
END LOOP;
FAILED ("DID NOT FIND LETTER " & FUNC);
RETURN 0;
END POS_OF;
BEGIN
TEST ("C97114A", "CHECK THAT THE DELAY EXPRESSIONS ARE" &
" EVALUATED AFTER THE GUARDS BUT" &
" BEFORE THE RENDEZVOUS IS ATTEMPTED" );
DECLARE
TASK T IS
ENTRY E1;
END T;
TASK BODY T IS
BEGIN
WHILE E1'COUNT = 0 -- IF E1 NOT YET CALLED, THEN GIVE
LOOP -- THE MAIN TASK AN OPPORTUNITY
DELAY 10.01 * Impdef.One_Second; -- TO ISSUE THE CALL.
END LOOP;
SELECT
ACCEPT E1;
OR
WHEN 6 + F1(7) = 13 =>
DELAY D1( DUMMY ) * Impdef.One_Second;
OR
WHEN 6 + F2(7) = 13 =>
DELAY D2( DUMMY ) * Impdef.One_Second;
OR
WHEN 6 + F3(7) = 13 =>
DELAY D3( DUMMY ) * Impdef.One_Second;
END SELECT;
END T;
BEGIN
T.E1;
END; -- END OF BLOCK CONTAINING THE ENTRY CALLS
COMMENT ("EVALUATIONS WERE DONE IN THE ORDER " & EVAL_ORD);
COMMENT ("FUNCTIONS WERE CALLED IN THE ORDER " & EVAL_ORDER);
IF EVAL_ORD = "GGGDDD" THEN
COMMENT ("ALL GUARDS EVALUATED FIRST");
ELSIF EVAL_ORD = "GDGDGD" THEN
COMMENT ("DELAY EXPRESSION EVALUATED AFTER EACH GUARD");
END IF;
-- CHECK THAT GUARDS ARE ALWAYS EVALUATED BEFORE DELAY EXPRESSIONS
IF POS_OF ('F') > POS_OF ('A') OR
POS_OF ('G') > POS_OF ('B') OR
POS_OF ('H') > POS_OF ('C') THEN
FAILED ("A DELAY EXPRESSION WAS EVALUATED BEFORE ITS " &
"GUARD");
END IF;
RESULT;
END C97114A;
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