| -- C97115A.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 AN ENTRY FAMILY INDEX 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 INDEX |
| -- EXPRESSIONS ARE EVALUATED AFTER THEIR GUARDS ARE DETERMINED TO BE |
| -- OPEN. |
| |
| -- RM 5/11/82 |
| -- 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 C97115A 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; |
| |
| |
| 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 I1 ( X:INTEGER ) RETURN BOOLEAN IS |
| BEGIN |
| INDEX := INDEX + 1; |
| EVAL_ORDER (INDEX) := 'A'; -- 123: ABC |
| EVAL_ORD (INDEX) := 'I'; -- 123: III ( 'I' FOR 'INDEX' ) |
| RETURN ( IDENT_BOOL(TRUE) ); -- (THAT'S ENTRY-FAMILY INDEX) |
| END I1; |
| |
| |
| FUNCTION I2 ( X:INTEGER ) RETURN BOOLEAN IS |
| BEGIN |
| INDEX := INDEX + 1; |
| EVAL_ORDER (INDEX) := 'B'; |
| EVAL_ORD (INDEX) := 'I'; |
| RETURN ( IDENT_BOOL(TRUE) ); |
| END I2; |
| |
| |
| FUNCTION I3 ( X:INTEGER ) RETURN BOOLEAN IS |
| BEGIN |
| INDEX := INDEX + 1; |
| EVAL_ORDER (INDEX) := 'C'; |
| EVAL_ORD (INDEX) := 'I'; |
| RETURN ( IDENT_BOOL(TRUE) ); |
| END I3; |
| |
| 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 ("C97115A", "CHECK THAT THE INDEX EXPRESSIONS ARE" & |
| " EVALUATED AFTER THE GUARDS BUT" & |
| " BEFORE THE RENDEZVOUS IS ATTEMPTED" ); |
| |
| |
| DECLARE |
| |
| |
| TASK T IS |
| |
| |
| ENTRY E ( BOOLEAN ); |
| 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 => |
| ACCEPT E ( I1(17) ); |
| |
| OR |
| |
| WHEN 6 + F2(7) = 13 => |
| ACCEPT E ( I2(17) ); |
| |
| OR |
| |
| WHEN 6 + F3(7) = 13 => |
| ACCEPT E ( I3(17) ); |
| |
| END SELECT; |
| |
| |
| END T; |
| |
| |
| BEGIN |
| |
| T.E1; |
| |
| END; -- END OF BLOCK CONTAINING THE ENTRY CALLS |
| |
| |
| COMMENT ("GUARD AND INDEX FUNCTIONS WERE CALLED IN ORDER " & |
| EVAL_ORDER); |
| COMMENT ("GUARD AND INDEX EXPRESSIONS WERE EVALUATED IN THE " & |
| "ORDER " & EVAL_ORD); |
| |
| IF POS_OF ('F') > POS_OF ('A') OR |
| POS_OF ('G') > POS_OF ('B') OR |
| POS_OF ('H') > POS_OF ('C') THEN |
| FAILED ("AN INDEX EXPRESSION WAS EVALUATED TOO EARLY"); |
| END IF; |
| |
| RESULT; |
| |
| END C97115A; |