private void RemoveProcess(ProcessControlBlock pcb)
{
lock (processes)
{
object[] items = new object[processes.Count];
processes.CopyTo(items, 0);
foreach (object o in items)
{
ProcessControlBlock old = (ProcessControlBlock)o;
if (old.ID == pcb.ID)
{
processes.Remove(o);
processes.Sort();
break;
}
}
}
}
/**This method facilitates Job Creation and regulates the Job Queue.
* */
private void Create()
{
ProcessControlBlock pcb = null;
while (true)
{
if (jobQueue.Count < 3 && readyQueue.Count < 4)
{
pcb = new ProcessControlBlock(++counter);
pcb.State = ProcessControlBlock.NEW;
AddProcess(pcb);
jobQueue.Enqueue(pcb);
statusJob = "Created Process " + pcb.ID + ".";
}
Thread.Sleep(3000);
}
}
/**This method fills the DataGridView with PCB information.
* */
private void PropagateDB(ProcessControlBlock pcb)
{
string state = "";
object[] values = null;
DataGridViewRow row = new DataGridViewRow();
row.HeaderCell.Value = pcb.ID + "";
switch (pcb.State)
{
case ProcessControlBlock.READY:
state = "Ready";
break;
case ProcessControlBlock.RUNNING:
state = "Running";
break;
case ProcessControlBlock.WAITING:
state = "Waiting";
break;
case ProcessControlBlock.TERMINATING:
state = "Terminating";
break;
case ProcessControlBlock.INTERRUPTED:
state = "Interrupted";
break;
default: return;
}
if (compactionToolStripMenuItem.Checked)
{
lock (compactionGridView)
{
if (compactionGridView.ColumnCount == 5)
{
values = new object[] { pcb.BaseNum, pcb.Limit, pcb.MemSize, state, pcb.State == ProcessControlBlock.TERMINATING ? 0 : pcb.CPUTime };
row.CreateCells(compactionGridView, values);
compactionGridView.Rows.Add(row);
}
}
}
else
{
lock (pagingGridView)
{
if (pagingGridView.ColumnCount == 5)
{
values = new object[] { pcb.MemSize, pcb.Pages.Count, pcb.Request - pcb.Pages.Count, state, pcb.State == ProcessControlBlock.TERMINATING ? 0 : pcb.CPUTime };
row.CreateCells(pagingGridView, values);
pagingGridView.Rows.Add(row);
}
}
}
}
/**Releases a process's hold on the CPU*/
public void FreeCPU(bool newProcess)
{
timer.Dispose();
if (newProcess)
{
isFree = true;
pcb = null;
}
}
public void EnqueueProcess(ProcessControlBlock pcb)
{
processes.Enqueue(pcb);
}
