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--- C940005.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 body of a protected function can have internal calls
--- to other protected functions and that the body of a protected
--- procedure can have internal calls to protected procedures and to
--- protected functions.
---
--- TEST DESCRIPTION:
--- Simulate a meter at a freeway on-ramp which, when real-time sensors
--- determine that the freeway is becoming saturated, triggers stop lights
--- which control the access of vehicles to prevent further saturation.
--- Each on-ramp is represented by a protected object - in this case only
--- one is shown (Test_Ramp). The routines to sample and alter the states
--- of the various sensors, to queue the vehicles on the meter and to
--- release them are all part of the protected object and can be shared
--- by various tasks. Apart from the function/procedure tests this example
--- has a mix of other tasking features.
---
---
--- CHANGE HISTORY:
--- 06 Dec 94 SAIC ACVC 2.0
--- 13 Nov 95 SAIC Updated and fixed bugs ACVC 2.0.1
---
---!
-
-
-with Report;
-with ImpDef;
-with Ada.Calendar;
-
-procedure C940005 is
-
-begin
-
- Report.Test ("C940005", "Check internal calls of protected functions" &
- " and procedures");
-
- declare -- encapsulate the test
-
- function "+" (Left : Ada.Calendar.Time; Right: Duration)
- return Ada.Calendar.Time renames Ada.Calendar."+";
-
- -- Weighted load given to each potential problem area and accumulated
- type Load_Factor is range 0..8;
- Clear_Level : constant Load_Factor := 0;
- Minimum_Level : constant Load_Factor := 1;
- Moderate_Level : constant Load_Factor := 2;
- Serious_Level : constant Load_Factor := 4;
- Critical_Level : constant Load_Factor := 6;
-
- -- Weighted loads given to each Sample Point (pure weights, not levels)
- Local_Overload_wt : constant Load_Factor := 1;
- Next_Ramp_in_Overload_wt : constant Load_Factor := 1;
- Ramp_Junction_in_Overload_wt : constant Load_Factor :=2; --higher wght
- -- :::: other weighted loads
-
- TC_Multiplier : integer := 1; -- changed half way through
- TC_Expected_Passage_Total : constant integer := 486;
-
- -- This is the time between synchronizing pulses to the ramps.
- -- In reality one would expect a time of 5 to 10 seconds. In
- -- the interests of speeding up the test suite a shorter time
- -- is used
- Pulse_Time_Delta : constant duration := ImpDef.Switch_To_New_Task;
-
- -- 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; -- task to generate a pulse for each ramp
-
- -- Carrier task. One is created for each vehicle arriving at the ramp
- task type Vehicle;
- type acc_Vehicle is access Vehicle;
-
- --================================================================
- protected Test_Ramp is
- function Next_Ramp_in_Overload return Load_Factor;
- function Local_Overload return Load_Factor;
- function Freeway_Overload return Load_Factor;
- function Freeway_Breakdown return Boolean;
- function Meter_in_use_State return Boolean;
- procedure Set_Local_Overload;
- procedure Add_Meter_Queue;
- procedure Subtract_Meter_Queue;
- procedure Time_Pulse_Received;
- entry Wait_at_Meter;
- procedure TC_Passage (Pass_Point : Integer);
- function TC_Get_Passage_Total return integer;
- -- ::::::::: many routines are not shown (for example none of the
- -- clears, none of the real-time-sensor handlers)
-
- private
-
- Release_One_Vehicle : Boolean := false;
- Meter_in_Use : Boolean := false;
- Fwy_Break_State : Boolean := false;
-
-
- Ramp_Count : integer range 0..20 := 0;
- Ramp_Count_Threshold : integer := 15;
-
- -- Current state of the various Sample Points
- Local_State : Load_Factor := Clear_Level;
- Next_Ramp_State : Load_Factor := Clear_Level;
- -- :::: other Sample Point states not shown
-
- TC_Passage_Total : integer := 0;
- end Test_Ramp;
- --================================================================
- protected body Test_Ramp is
-
- procedure Start_Meter is
- begin
- Meter_in_Use := True;
- null; -- stub :::: trigger the metering hardware
- end Start_Meter;
-
- -- External call for Meter_in_Use
- function Meter_in_Use_State return Boolean is
- begin
- return Meter_in_Use;
- end Meter_in_Use_State;
-
- -- Trace the paths through the various routines by totaling the
- -- weighted call parameters
- procedure TC_Passage (Pass_Point : Integer) is
- begin
- TC_Passage_Total := TC_Passage_Total+(Pass_Point*TC_Multiplier);
- end TC_Passage;
-
- -- For the final check of the whole test
- function TC_Get_Passage_Total return integer is
- begin
- return TC_Passage_Total;
- end TC_Get_Passage_Total;
-
- -- These Set/Clear routines are triggered by real-time sensors that
- -- reflect traffic state
- procedure Set_Local_Overload is
- begin
- Local_State := Local_Overload_wt;
- if not Meter_in_Use then
- Start_Meter; -- LOCAL INTERNAL PROCEDURE FROM PROCEDURE
- end if;
- end Set_Local_Overload;
-
- --::::: Set/Clear routines for all the other sensors not shown
-
- function Local_Overload return Load_Factor is
- begin
- return Local_State;
- end Local_Overload;
-
- function Next_Ramp_in_Overload return Load_Factor is
- begin
- return Next_Ramp_State;
- end Next_Ramp_in_Overload;
-
- -- :::::::: other overload factor states not shown
-
- -- return the summation of all the load factors
- function Freeway_Overload return Load_Factor is
- begin
- return Local_Overload -- EACH IS A CALL OF A
- -- + :::: others -- FUNCTION FROM WITHIN
- + Next_Ramp_in_Overload; -- A FUNCTION
- end Freeway_Overload;
-
- -- Freeway Breakdown is defined as traffic moving < 5mph
- function Freeway_Breakdown return Boolean is
- begin
- return Fwy_Break_State;
- end Freeway_Breakdown;
-
- -- Keep count of vehicles currently on meter queue - we can't use
- -- the 'count because we need the outcall trigger
- procedure Add_Meter_Queue is
- TC_Pass_Point : constant integer := 22;
- begin
- Ramp_Count := Ramp_Count + 1;
- TC_Passage ( TC_Pass_Point ); -- note passage through here
- if Ramp_Count > Ramp_Count_Threshold then
- null; -- :::: stub, trigger surface street notification
- end if;
- end Add_Meter_Queue;
- --
- procedure Subtract_Meter_Queue is
- TC_Pass_Point : constant integer := 24;
- begin
- Ramp_Count := Ramp_Count - 1;
- TC_Passage ( TC_Pass_Point ); -- note passage through here
- end Subtract_Meter_Queue;
-
- -- Here each Vehicle task queues itself awaiting release
- entry Wait_at_Meter when Release_One_Vehicle is
- -- EXAMPLE OF ENTRY WITH BARRIERS AND PERSISTENT SIGNAL
- TC_Pass_Point : constant integer := 23;
- begin
- TC_Passage ( TC_Pass_Point ); -- note passage through here
- Release_One_Vehicle := false; -- Consume the signal
- -- Decrement number of vehicles on ramp
- Subtract_Meter_Queue; -- CALL PROCEDURE FROM WITHIN ENTRY BODY
- end Wait_at_Meter;
-
-
- procedure Time_Pulse_Received is
- Load : Load_factor := Freeway_Overload; -- CALL MULTILEVEL
- -- FUNCTION
- -- FROM WITHIN PROCEDURE
- begin
- -- if broken down, no vehicles are released
- if not Freeway_Breakdown then -- CALL FUNCTION FROM A PROCEDURE
- if Load < Moderate_Level then
- Release_One_Vehicle := true;
- end if;
- null; -- stub ::: If other levels, release every other
- -- pulse, every third pulse etc.
- end if;
- end Time_Pulse_Received;
-
- end Test_Ramp;
- --================================================================
-
-
- -- Simulate the arrival of a vehicle at the Ramp_Receiver and the
- -- generation of an accompanying carrier task
- procedure New_Arrival is
- Next_Vehicle_Task: acc_Vehicle := new Vehicle;
- TC_Pass_Point : constant integer := 3;
- begin
- Test_Ramp.TC_Passage ( TC_Pass_Point ); -- Note passage through here
- null;
- end New_arrival;
-
-
- -- Carrier task. One is created for each vehicle arriving at the ramp
- task body Vehicle is
- TC_Pass_point : constant integer := 1;
- TC_Pass_Point_2 : constant integer := 21;
- TC_Pass_Point_3 : constant integer := 2;
- begin
- Test_Ramp.TC_Passage ( TC_Pass_Point ); -- note passage through here
- if Test_Ramp.Meter_in_Use_State then
- Test_Ramp.TC_Passage ( TC_Pass_Point_2 ); -- note passage
- -- Increment count of number of vehicles on ramp
- Test_Ramp.Add_Meter_Queue; -- CALL a protected PROCEDURE
- -- which is also called from within
- -- enter the meter queue
- Test_Ramp.Wait_at_Meter; -- CALL a protected ENTRY
- end if;
- Test_Ramp.TC_Passage ( TC_Pass_Point_3 ); -- note passage thru here
- null; --:::: call to the first in the series of the Ramp_Sensors
- -- this "passes" the vehicle from one sensor to the next
- exception
- when others =>
- Report.Failed ("Unexpected exception in Vehicle Task");
- end Vehicle;
-
-
- -- Task transmits a synchronizing "pulse" to all ramps
- --
- task body Pulse_Task is
- Pulse_Time : Ada.Calendar.Time := Ada.Calendar.Clock;
- begin
- While not Control.Stop loop
- delay until Pulse_Time;
- Test_Ramp.Time_Pulse_Received; -- causes INTERNAL CALLS
- -- :::::::::: and to all the others
- Pulse_Time := Pulse_Time + Pulse_Time_Delta; -- calculate next
- end loop;
- exception
- when others =>
- Report.Failed ("Unexpected exception in Pulse_Task");
- end Pulse_Task;
-
-
- begin -- declare
-
- -- Test driver. This is ALL test control code
-
- -- First simulate calls to the protected functions and procedures
- -- from without the protected object
- --
- -- CALL FUNCTIONS
- if Test_Ramp.Local_Overload /= Clear_Level then
- Report.Failed ("External Call to Local_Overload incorrect");
- end if;
- if Test_Ramp.Next_Ramp_in_Overload /= Clear_Level then
- Report.Failed ("External Call to Next_Ramp_in_Overload incorrect");
- end if;
- if Test_Ramp.Freeway_Overload /= Clear_Level then
- Report.Failed ("External Call to Freeway_Overload incorrect");
- end if;
-
- -- Now Simulate the arrival of a vehicle to verify path through test
- New_Arrival;
- delay Pulse_Time_Delta*2; -- allow it to pass through the complex
-
- TC_Multiplier := 5; -- change the weights for the paths for the next
- -- part of the test
-
- -- Simulate a real-time sensor reporting overload
- Test_Ramp.Set_Local_Overload; -- CALL A PROCEDURE (and change levels)
-
- -- CALL FUNCTIONS again
- if Test_Ramp.Local_Overload /= Minimum_Level then
- Report.Failed ("External Call to Local_Overload incorrect - 2");
- end if;
- if Test_Ramp.Freeway_Overload /= Minimum_Level then
- Report.Failed ("External Call to Freeway_Overload incorrect -2");
- end if;
-
- -- Now Simulate the arrival of another vehicle again causing
- -- INTERNAL CALLS but following different paths (queuing on the
- -- meter etc.)
- New_Arrival;
- delay Pulse_Time_Delta*2; -- allow it to pass through the complex
-
- Control.Stop_Now; -- finish test
-
- if TC_Expected_Passage_Total /= Test_Ramp.TC_Get_Passage_Total then
- Report.Failed ("Unexpected paths taken");
- end if;
-
- end; -- declare
-
- Report.Result;
-
-end C940005;