Psim3 Simulation Model

1
Psim3 Simulation Model

• Declare constants and variables of the model. For
  example
• double simperiod // simulation period
• Declare forward class definitions
• class controller // declaration of class
• Declare pointer variables to the various objects
  in the model. For example
• gate gate_obj // ptr var to gate object
• waitq cg // ptr var to channel object
• simulation run // simulation engine

2
Psim3 Simulation Model

• Class specification for all objects in the model
• // Process definitions
• // model class
• class Train public process
• public
• Train(char name) // constructor
• void Main_body () // main body of process

3
Psim3 Simulation Model

• Class implementations
• TrainTrain (char name) process (name)
• cout ltlt t_name ltlt " created " ltlt endl
• void TrainMain_body()
• double mean_enter 45.5 // average
  inter-arrival period of trains
• double mean_exit 20.75 // average
  inter-departure period of trains
• double y 12.5 // latest delay for
  controller to signal gate
• z 11.25 // time taken to
  open/close gate

4
Class Implementations (2)

• se_obj new sensor_e("Entry sensor",
  mean_enter)
• sl_obj new sensor_l("Exit sensor",
  mean_exit)
• cont_obj new controller("Controller", y)
• gate_obj new gate("Gate", z, y)
• monit_obj new monitor("Monitor")
• //
• se_obj-gtpstart()
• sl_obj-gtpstart()
• cont_obj-gtpstart()
• gate_obj-gtpstart()
• monit_obj-gtpstart()
• //
• run-gtstart_sim(simperiod) // start
  simulation

5
Class Implementations (3)

• //
• cout ltlt endl
• cout ltlt "---------------------------------------
  --" ltlt endl
• cout ltlt "Total trains that arrived " ltlt
  trains_arr ltlt endl
• cout ltlt "Average system reaction time "
• ltlt avg_reaction / float(trains_arr) ltlt
  endl
• cout ltlt "Average system response time "
• ltlt avg_response / float(trains_arr) ltlt
  endl
• cout ltlt "Worst reaction time " ltlt
  worst_reaction ltlt endl
• cout ltlt "Worst response time " ltlt
  worst_response ltlt endl
• cout ltlt "Number of deadlines missed in closing
  Gate "
• ltlt close_deadline ltlt endl
• cout ltlt "Number deadlines missed, Controller
  comm with Gate "
• ltlt deadline_g ltlt endl

6
Psim3 Model -- Function main

• int main ()
• run new simulation("Simple Gate-Train
  Model")
• simperiod 2200.25
• close_arrival 1750.10 // no more train
  arrivals
• //
• // Channel objects creation and initialization
• //
• cg new waitq("CG Channel")
• og new waitq("OG Channel")
• gok new waitq("GOK Channel")
• cont_cg new waitq("CCG Chan")
• cont_og new waitq("COG Chan")
• trin new waitq("Trin Chan")
• trout new waitq("Trout Chan")
• tr new waitq("TR Chan")

7
Psim3 Model -- Function main

• // Process initialization
• //
• Train mtrain // declaration of the
  reference variable for
• // the object of the simulation model
• //
• mtrain new Train("Train simulation") //
  Create train object
• mtrain-gtpstart() //
  start its thread
• run-gtend_sim()
• return(0)

8
Main Body

• void controllerMain_body()
• double wait_t
• //
• while (get_clock() lt simperiod)
• get_sclose() // get signal from monitor
  to close
• // and send close signal to gate
• get_sopen() // get signal from monitor
  to open
• // and send open signal to gate
• // end while
• terminate()
• // end Main_body

9
Using delay()

• void controlleralarm_cl()
• close_deadline // deadline missed
• cout ltlt "Alarm, Gate has not completely
  closed at" ltlt get_clock() ltlt endl
• delay(1.15) // some delay before
  comm
• // end alarm_cl