static void Main()
{
Application.EnableVisualStyles();
Application.SetCompatibleTextRenderingDefault(false);
while (true)
{
try
{
Console.WriteLine("Press 1 for FCFS, 2 for SJF, 3 for Priority, 4 for Round Robin");
switch (Console.ReadKey(true).KeyChar)
{
case '1':
Console.WriteLine("FCFS");
SCH.State = 1;
new Scheduler().createProcesses();
break;
case '2':
while (true)
{
Console.WriteLine("SJF: Press 1 for non preemptive, 2 for preemptive");
char c = Console.ReadKey(true).KeyChar;
if (c == '2')
{
Console.WriteLine("Preemptive");
SCH.State = 2;
break;
}
else if (c == '1')
{
Console.WriteLine("Non Preemptive");
SCH.State = 3;
break;
}
}
new Scheduler().createProcesses();
break;
case '3':
while (true)
{
Console.WriteLine("Priority: Press 1 for non preemptive, 2 for preemptive");
char c = Console.ReadKey(true).KeyChar;
if (c == '2')
{
Console.WriteLine("Preemptive");
SCH.State = 4;
break;
}
else if (c == '1')
{
Console.WriteLine("Non Preemptive");
SCH.State = 5;
break;
}
}
new Scheduler().createProcesses();
break;
case '4':
SCH.State = 6;
Console.Write("Round Robin\nEnter Quantum time: ");
SCH.quantum = Convert.ToInt32(Console.ReadLine());
new Scheduler().createProcesses();
break;
}
Console.WriteLine("Press anything to restart.");
Console.ReadKey(true);
foreach (Form1 a in SCH.allForms)
{
if (a.Visible)
{
a.Visible = false;
}
}
SCH.resetALL();
Console.WriteLine("\n");
}
catch
{
MessageBox.Show("EXCEPTION! Program restarting..", "ERROR",
MessageBoxButtons.OK, MessageBoxIcon.Error);
Console.WriteLine("\n");
continue;
}
}
}
public void createProcesses()
{
while (true)
{
Console.Write("\nEnter Process " + SCH.i + " burst time: ");
Process p = new Process(Convert.ToInt32(Console.ReadLine()));
Console.Write("Enter Process " + SCH.i + " arrival time: ");
p.arriveTime = Convert.ToInt32(Console.ReadLine());
if (SCH.State == 4 || SCH.State == 5)
{
Console.Write("Enter Process " + SCH.i + " priority: ");
p.priority = Convert.ToInt32(Console.ReadLine());
}
p.id = SCH.i++;
SCH.allProcesses.Add(p);
Console.WriteLine("Press 0 to finish, anything else to add another process");
char chary = Console.ReadKey(true).KeyChar;
if (chary == '0')
{
break;
}
}
Form1 newForm = new Form1();
if (SCH.State == 4 || SCH.State == 5)//hide priority shit if priority mode
{
newForm.showPriority();
}
SCH.allForms.Add(newForm);
new Thread(delegate()
{
Application.Run(newForm);
}).Start();
Console.Write("\nGantt Chart: \n ");
int countPS = 0;
int oldPid = -1;
//sort at first
if (SCH.State == 3)
{
SCH.allProcesses.Sort(delegate(Process x, Process y)
{
return(x.burstTimeOriginal.CompareTo(y.burstTimeOriginal));
});
}
else if (SCH.State == 1)
{
SCH.allProcesses.Sort(delegate(Process x, Process y)
{
return(x.arriveTime.CompareTo(y.arriveTime));
});
}
else if (SCH.State == 5)
{
SCH.allProcesses.Sort(delegate(Process x, Process y)
{
return(x.priority.CompareTo(y.priority));
});
}
while (SCH.allProcesses.Count > 0) // run until all processes finish
{
Thread.Sleep(SCH.speed);
foreach (Process a in SCH.allProcesses)
{
if (a.burstTimeLeft <= 0)
{
continue;
}
if (SCH.State != 6)
{
if (SCH.arrivedProcesses.Contains(a))
{
continue;
}
if (a.arriveTime <= SCH.currentTime)
{
SCH.arrivedProcesses.Add(a);
a.startTime = SCH.currentTime;
}
}
else
{
if (arrivedProcessesQ.Contains(a))
{
continue;
}
if (a.arriveTime <= SCH.currentTime)
{
a.startTime = SCH.currentTime;
arrivedProcessesQ.Enqueue(a);
}
}
}
countPS++;
int Xstart = (20) * SCH.currentTime;
newForm.g.FillRectangle(DrawTools.BlackBrush, new Rectangle(Xstart - 1, 90, 1, 10));
newForm.g.DrawString(SCH.currentTime.ToString(), DrawTools.fonty, DrawTools.BlackBrush, Xstart - 10, 100);
//if non arrived yet //if gap
if ((SCH.arrivedProcesses.Count == 0 && SCH.State != 6) || arrivedProcessesQ.Count == 0 && SCH.State == 6)
{
//print gap
Console.Write(" . ");
newForm.g.FillRectangle(DrawTools.WhiteBrush, new Rectangle((20) * SCH.currentTime, 50, 20, 50));
newForm.g.FillRectangle(DrawTools.BlackBrush, new Rectangle(Xstart - 1, 50, 2, 50));
SCH.currentTime++;
continue;
}
//sort by shortest burst every sec if preemptive
if (SCH.State == 2)
{
SCH.arrivedProcesses.Sort(delegate(Process x, Process y)
{
return(x.burstTimeLeft.CompareTo(y.burstTimeLeft));
});
}
else if (SCH.State == 4)
{
SCH.arrivedProcesses.Sort(delegate(Process x, Process y)
{
return(x.priority.CompareTo(y.priority));
});
}
//Run first P in arrived List for one time unit
Process P;
bool quantumaDone = false;
if (SCH.State != 6)
{
P = SCH.arrivedProcesses[0];
}
else // priority
{
if (arrivedProcessesQ.Peek().ranQuantums == SCH.quantum)
{
quantumaDone = true;
newForm.g.FillRectangle(DrawTools.BlackBrush, new Rectangle(Xstart - 1, 50, 2, 50));
arrivedProcessesQ.Peek().ranQuantums = 0;
arrivedProcessesQ.Enqueue(arrivedProcessesQ.Dequeue());
}
P = arrivedProcessesQ.Peek();
arrivedProcessesQ.Peek().ranQuantums++;
}
Console.Write("P" + P.id + " ");//run P this second
newForm.g.FillRectangle(DrawTools.RedBrush, new Rectangle(Xstart, 50, 20, 50));
if (P.id != oldPid || (SCH.State == 6 && quantumaDone))
{
newForm.g.DrawString(("P" + P.id), DrawTools.fonty, DrawTools.BlackBrush, Xstart, 50);
newForm.g.FillRectangle(DrawTools.BlackBrush, new Rectangle(Xstart - 1, 50, 2, 50));
oldPid = P.id;
}
P.burstTimeLeft--;
//if process done then mark as done
if (P.burstTimeLeft == 0)
{
P.endTime = SCH.currentTime + 1;
P.calcWaitingTimeAndAddAvg();
SCH.allProcesses.Remove(P);
if (SCH.State != 6)
{
SCH.arrivedProcesses.Remove(P);
}
else
{
arrivedProcessesQ.Dequeue();
}
if (SCH.State == 3)
{
SCH.arrivedProcesses.Sort(delegate(Process x, Process y)
{
return(x.burstTimeOriginal.CompareTo(y.burstTimeOriginal));
});
}
else if (SCH.State == 5)
{
SCH.arrivedProcesses.Sort(delegate(Process x, Process y)
{
return(x.priority.CompareTo(y.priority));
});
}
else if (SCH.State == 1)
{
SCH.arrivedProcesses.Sort(delegate(Process x, Process y)
{
return(x.arriveTime.CompareTo(y.arriveTime));
});
}
}
SCH.currentTime++;
}
//All processes finish here
SCH.calcAvgTime();
Console.Write("\n");
for (int H = 0; H < countPS + 1; H++)
{
Console.Write(H.ToString("00") + " ");
}
Console.Write("\n");
Console.WriteLine("\nAverage Waiting time: " + SCH.avgWaitingTime + "\n\n");
newForm.label4.Text = "Average Waiting time: " + SCH.avgWaitingTime;
}
