// multi.cpp     Dave Reed      9/20/03
//
// SIMPLE multiprogramming simulator.  A collection of jobs are read in from
// a file, and then executed using timesharing.  A job can be preemtped when 
// it requests an I/O operation, or when its time slice expires.
///////////////////////////////////////////////////////////////////////////////

#include <iostream>
#include "Job.h"
#include "JobStream.h"
#include "CPUScheduler.h"
using namespace std;

const string JOB_FILE = "jobs.dat";     // FILE CONTAINING JOB DATA

int main()
{
  JobStream ArrivingJobs(JOB_FILE);     // CREATE THE JOB INPUT STREAM
  CPUScheduler CPU;                     // CREATE THE CPU SCHEDULER

  int time = 0;                         // INIT THE SYSTEM CLOCK

  while (CPU.JobsRemaining() || ArrivingJobs.JobsRemaining()) {
    time++;                                         // AS LONG AS JOBS TO PROCESS
                                                    //   INCREMENT THE CLOCK
    while (ArrivingJobs.JobHasArrived(time)) {      //   ENTER ANY NEW JOBS AND
        CPU.AddNewJob(ArrivingJobs.GetJob(), time);
    }
    CPU.Execute(time);                              //   EXECUTE A CPU CYCLE
  }

  cout << "DONE PROCESSING" << endl;
  return 0;
}