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-- C974012.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 call on a protected
-- entry which is queued.
--
-- TEST DESCRIPTION:
-- A fraction of in-line code is simulated. A voltage deficiency causes
-- the routine to seek an alternate best-cost route on an electrical grid
-- system.
--
-- An asynchronous select is used with the triggering alternative being a
-- call to a protected entry with a barrier. The abortable part is a
-- routine simulating the lengthy alternate path negotiation. The entry
-- barrier would be cleared if the voltage deficiency is rectified before
-- the alternate can be found thus nullifying the need for the alternate.
--
-- The test simulates a return to normal in the middle of the
-- negotiation. The barrier is cleared, the triggering alternative
-- completes first and the abortable part should be aborted.
--
--
-- CHANGE HISTORY:
-- 06 Dec 94 SAIC ACVC 2.0
--
--!
with Report;
with ImpDef;
procedure C974012 is
subtype Grid_Path is string(1..21);
subtype Deficiency is integer range 100..1_000; -- in MWh
New_Path : Grid_Path;
Dummy_Deficiency : Deficiency := 520;
Path_Available : Boolean := false;
TC_Terminate_Negotiation_Executed : Boolean := false;
TC_Trigger_Completed : Boolean := false;
TC_Negotiation_Completed : Boolean := false;
protected Local_Deficit is
procedure Set_Good_Voltage;
procedure Bad_Voltage;
entry Terminate_Negotiation;
private
Good_Voltage : Boolean := false; -- barrier
end Local_Deficit;
protected body Local_Deficit is
procedure Set_Good_Voltage is
begin
Good_Voltage := true;
end Set_Good_Voltage;
procedure Bad_Voltage is
begin
Good_Voltage := false;
end Bad_Voltage;
-- Trigger is queued on this entry with barrier condition
entry Terminate_Negotiation when Good_Voltage is
begin
-- complete the triggering call thus terminating grid_path
-- negotiation.
null; --::: stub - signal main board
TC_Terminate_Negotiation_Executed := true; -- show path traversal
end Terminate_Negotiation;
end Local_Deficit;
-- Routine to find the most cost effective grid path for this
-- particular deficiency at this particular time
--
procedure Path_Negotiation (Requirement : in Deficiency;
Best_Path : out Grid_Path ) is
Dummy_Path : Grid_Path := "NYC.425_NY.227_NH.132";
Match : Deficiency := Report.Ident_Int (Requirement);
begin
--
null; --::: stub
--
-- Simulate a lengthy path negotiation
for i in 1..5 loop
delay ImpDef.Minimum_Task_Switch;
-- Part of the way through the negotiation simulate some external
-- event returning the voltage to acceptable level
if i = 3 then
Local_Deficit.Set_Good_Voltage; -- clear the barrier
end if;
end loop;
Best_Path := Dummy_Path;
TC_Negotiation_Completed := true;
end Path_Negotiation;
begin
Report.Test ("C974012", "Asynchronous Select: Trigger is queued on a " &
"protected entry and completes before the " &
"abortable part");
-- ::::::::: Fragment of code
Local_Deficit.Bad_Voltage; -- Set barrier condition
-- For the given voltage deficiency start negotiating the best grid
-- path. If voltage returns to acceptable level cancel the negotiation
--
select
-- Prepare to terminate the Path_Negotiation if voltage improves
Local_Deficit.Terminate_Negotiation;
TC_Trigger_Completed := true;
then abort
Path_Negotiation (Dummy_Deficiency, New_Path) ;
Path_Available := true;
end select;
-- :::::::::
if not TC_Terminate_Negotiation_Executed or else not
TC_Trigger_Completed then
Report.Failed ("Unexpected test path taken");
end if;
if Path_Available or else TC_Negotiation_Completed then
Report.Failed ("Abortable part was not aborted");
end if;
Report.Result;
end C974012;
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