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jeremybenn |
-- C974002.A
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--
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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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--
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-- OBJECTIVE:
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-- Check that the sequence of statements of the triggering alternative
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-- of an asynchronous select statement is executed if the triggering
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-- statement is a delay_until statement, and the specified time has
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-- already passed. Check that the abortable part is not executed after
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-- the sequence of statements of the triggering alternative is left.
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--
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-- Check that the sequence of statements of the triggering alternative
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-- of an asynchronous select statement is not executed if the abortable
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-- part completes before the triggering statement, and the triggering
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-- statement is a delay_until statement.
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--
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-- TEST DESCRIPTION:
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-- Declare a task with an accept statement containing an asynchronous
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-- select with a delay_until triggering statement. Parameterize
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-- the accept statement with the time to be used in the delay. Simulate
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-- a quick calculation by declaring a procedure which sets a Boolean
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-- flag. Call this procedure in the abortable part.
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--
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-- Make two calls to the task entry: (1) with a time that has already
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-- expired, and (2) with a time that will not expire before the quick
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-- calculation completes.
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--
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-- For (1), the sequence of statements following the triggering statement
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-- is executed, and the abortable part never starts.
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--
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-- For (2), the abortable part completes before the triggering statement,
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-- the delay is canceled, and the sequence of statements following the
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-- triggering statement never starts.
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--
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--
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-- CHANGE HISTORY:
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-- 06 Dec 94 SAIC ACVC 2.0
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-- 26 Nov 95 SAIC Bug fix for ACVC 2.0.1.
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--
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--!
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with Report;
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with Ada.Calendar;
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with ImpDef;
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procedure C974002 is
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function "-" (Left: Ada.Calendar.Time; Right: Duration )
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return Ada.Calendar.Time renames Ada.Calendar."-";
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function "+" (Left: Ada.Calendar.Time; Right: Duration )
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return Ada.Calendar.Time renames Ada.Calendar."+";
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Abortable_Part_Executed : Boolean;
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Triggering_Alternative_Executed : Boolean;
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--========================================================--
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procedure Quick_Calculation is
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begin
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if Report.Equal (1, 1) then
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Abortable_Part_Executed := True;
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end if;
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end Quick_Calculation;
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--========================================================--
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task type Timed_Calculation_Task is
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entry Calculation (Time_Out : in Ada.Calendar.Time);
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end Timed_Calculation_Task;
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task body Timed_Calculation_Task is
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begin
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loop
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select
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accept Calculation (Time_Out : in Ada.Calendar.Time) do
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-- --
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-- Asynchronous select is tested here --
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-- --
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select
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delay until Time_Out; -- Triggering
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-- statement.
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Triggering_Alternative_Executed := True; -- Triggering
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-- alternative.
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then abort
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Quick_Calculation; -- Abortable part.
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end select;
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end Calculation;
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or
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terminate;
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end select;
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end loop;
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exception
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when others =>
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Report.Failed ("Unexpected exception in Timed_Calculation_Task");
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end Timed_Calculation_Task;
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--========================================================--
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Start_Time : constant Ada.Calendar.Time :=
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Ada.Calendar.Time_of (1901,1,1);
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Minute : constant Duration := 60.0;
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--========================================================--
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begin -- Main program.
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Report.Test ("C974002", "Asynchronous Select with Delay_Until");
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-- take care of implementations that start the clock at 1/1/01
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delay ImpDef.Delay_For_Time_Past;
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Abortable_Part_Executed := False;
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Triggering_Alternative_Executed := False;
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NO_DELAY_SUBTEST:
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declare
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-- Set Expiry to a time which has already passed
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Expiry : constant Ada.Calendar.Time := Start_Time;
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Timed : Timed_Calculation_Task;
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begin
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-- Expiry is the time to be specified in the delay_until statement
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-- of the asynchronous select. Since it has already passed, the
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-- abortable part should not execute, and the sequence of statements
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-- of the triggering alternative should be executed.
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Timed.Calculation (Time_Out => Expiry); -- Asynchronous select
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-- inside accept block.
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if Abortable_Part_Executed then
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Report.Failed ("No delay: Abortable part was executed");
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end if;
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if not Triggering_Alternative_Executed then
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Report.Failed ("No delay: triggering alternative sequence " &
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"of statements was not executed");
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end if;
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end No_Delay_Subtest;
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Abortable_Part_Executed := False;
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Triggering_Alternative_Executed := False;
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LONG_DELAY_SUBTEST:
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declare
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-- Quick_Calculation should finish before expiry.
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Expiry : constant Ada.Calendar.Time :=
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Ada.Calendar.Clock + Minute;
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Timed : Timed_Calculation_Task;
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begin
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-- Expiry is the time to be specified in the delay_until statement
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-- of the asynchronous select. It should not pass before the abortable
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-- part completes, at which time control should return to the caller;
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-- the sequence of statements of the triggering alternative should
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-- not be executed.
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Timed.Calculation (Time_Out => Expiry); -- Asynchronous select.
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if not Abortable_Part_Executed then
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Report.Failed ("Long delay: Abortable part was not executed");
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end if;
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if Triggering_Alternative_Executed then
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Report.Failed ("Long delay: triggering alternative sequence " &
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"of statements was executed");
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end if;
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end Long_Delay_Subtest;
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Report.Result;
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end C974002;
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