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-- C974001.A
--
--
-- 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.
--*
--
-- OBJECTIVE:
-- Check that the abortable part of an asynchronous select statement
-- is aborted if it does not complete before the triggering statement
-- completes, where the triggering statement is a delay_relative
-- statement and check that the sequence of statements of the triggering
-- alternative is executed after the abortable part is left.
--
-- TEST DESCRIPTION:
-- Declare a task with an accept statement containing an asynchronous
-- select with a delay_relative triggering statement. Parameterize
-- the accept statement with the time to be used in the delay. Simulate a
-- time-consuming calculation by declaring a procedure containing an
-- infinite loop. Call this procedure in the abortable part.
--
-- The delay will expire before the abortable part completes, at which
-- time the abortable part is aborted, and the sequence of statements
-- following the triggering statement is executed.
--
--
-- CHANGE HISTORY:
-- 06 Dec 94 SAIC ACVC 2.0
--
--!
with Report;
with ImpDef;
procedure C974001 is
--========================================================--
-- Medium length delay
Allotted_Time : constant Duration := ImpDef.Switch_To_New_Task;
Calculation_Canceled : exception;
Count : Integer := 1234;
procedure Lengthy_Calculation is
begin
-- Simulate a non-converging calculation.
loop -- Infinite loop.
Count := (Count + 1) mod 10;
delay ImpDef.Minimum_Task_Switch; -- allow other task
end loop;
end Lengthy_Calculation;
--========================================================--
task type Timed_Calculation is
entry Calculation (Time_Limit : in Duration);
end Timed_Calculation;
task body Timed_Calculation is
--
begin
loop
select
accept Calculation (Time_Limit : in Duration) do
-- --
-- Asynchronous select is tested here --
-- --
select
delay Time_Limit; -- Time_Limit is not up yet, so
-- Lengthy_Calculation starts.
raise Calculation_Canceled; -- This is executed after
-- Lengthy_Calculation aborted.
then abort
Lengthy_Calculation; -- Delay expires before complete,
-- so this call is aborted.
-- Check that the whole of the abortable part is aborted,
-- not just the statement in the abortable part that was
-- executing at the time
Report.Failed ("Abortable part not aborted");
end select;
Report.Failed ("Triggering alternative sequence of " &
"statements not executed");
exception -- New Ada 9x: handler within accept
when Calculation_Canceled =>
if Count = 1234 then
Report.Failed ("Abortable part did not execute");
end if;
end Calculation;
or
terminate;
end select;
end loop;
exception
when others =>
Report.Failed ("Unexpected exception in Timed_Calculation task");
end Timed_Calculation;
--========================================================--
begin -- Main program.
Report.Test ("C974001", "Asynchronous Select: Trigger is delay_relative" &
" which completes before abortable part");
declare
Timed : Timed_Calculation; -- Task.
begin
Timed.Calculation (Time_Limit => Allotted_Time); -- Asynchronous select
-- inside accept block.
exception
when Calculation_Canceled =>
null; -- expected behavior
end;
Report.Result;
end C974001;
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