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-- C960001.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:
-- Confirm that a simple Delay Until statement is performed. Check
-- that the delay does not complete before the requested time and that it
-- does complete thereafter
--
-- TEST DESCRIPTION:
-- Simulate a task that sends a "pulse" at regular intervals. The Delay
-- Until statement is used to avoid accumulated drift. For the
-- test, we expect the delay to return very close to the requested time;
-- we use an additional Pulse_Time_Delta for the limit. The test
-- driver (main) artificially limits the number of iterations by setting
-- the Stop_Pulse Boolean after a small number.
--
--
-- CHANGE HISTORY:
-- 06 Dec 94 SAIC ACVC 2.0
-- 15 Nov 95 SAIC Fixed global variable problem for ACVC 2.0.1
--
--!
with Report;
with Ada.Calendar;
with ImpDef;
procedure C960001 is
begin
Report.Test ("C960001", "Simple Delay Until");
declare -- To get the Report.Result after all has completed
function "+" (Left : Ada.Calendar.Time; Right: Duration)
return Ada.Calendar.Time renames Ada.Calendar."+";
function "<" (Left, Right : Ada.Calendar.Time)
return Boolean renames Ada.Calendar."<";
function ">" (Left, Right : Ada.Calendar.Time)
return Boolean renames Ada.Calendar.">";
TC_Loop_Count : integer range 0..4 := 0;
-- control over stopping tasks
protected Control is
procedure Stop_Now;
function Stop return Boolean;
private
Halt : Boolean := False;
end Control;
protected body Control is
procedure Stop_Now is
begin
Halt := True;
end Stop_Now;
function Stop return Boolean is
begin
return Halt;
end Stop;
end Control;
task Pulse_Task is
entry Trigger;
end Pulse_Task;
-- Task to synchronize all qualified receivers.
-- The entry Trigger starts the synchronization; Control.Stop
-- becoming true terminates the task.
--
task body Pulse_Task is
Pulse_Time : Ada.Calendar.Time;
Pulse_Time_Delta : duration := ImpDef.Clear_Ready_Queue;
TC_Last_Time : Ada.Calendar.Time;
TC_Current : Ada.Calendar.Time;
-- This routine transmits a synchronizing "pulse" to
-- all receivers
procedure Pulse is
begin
null; -- Stub
Report.Comment (".......PULSE........");
end Pulse;
begin
accept Trigger;
Pulse_Time := Ada.Calendar.Clock + Pulse_Time_Delta;
TC_Last_Time := Pulse_Time;
while not Control.Stop loop
delay until Pulse_Time;
Pulse;
-- Calculate time for next pulse. Note: this is based on the
-- last pulse time, not the time we returned from the delay
--
Pulse_Time := Pulse_Time + Pulse_Time_Delta;
-- Test Control:
TC_Current := Ada.Calendar.Clock;
if TC_Current < TC_Last_Time then
Report.Failed ("Delay expired before requested time");
end if;
if TC_Current > Pulse_Time then
Report.Failed ("Delay too long");
end if;
TC_Last_Time := Pulse_Time;
TC_Loop_Count := TC_Loop_Count +1;
end loop;
exception
when others =>
Report.Failed ("Unexpected exception in Pulse_Task");
end Pulse_Task;
begin -- declare
Pulse_Task.Trigger; -- Start test
-- Artificially limit the number of iterations
while TC_Loop_Count < 3 loop
delay ImpDef.Minimum_Task_Switch;
end loop;
--
Control.Stop_Now; -- End test
end; -- declare
Report.Result;
end C960001;
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