public void Tick()
{
if (CurrentProcess == null || CurrentProcess.Quanta == 0 || CurrentProcess == IdleProcess)
{
CurrentProcess = SwitchToNextProcess();
}
Stream codeStream = GetMemoryStream(CurrentProcess.Code);
var codeReader = new CodeReader(codeStream);
var instruction = codeReader[Ip];
if (instruction != null)
{
Execute(instruction);
}
else
{
foreach (var page in CurrentProcess.PageTable)
{
Ram.Free(page);
}
CurrentProcess.IsRunning = false;
CurrentProcess = null;
}
TickSleepTimer();
ReadTerminal();
WriteTerminal();
TickCount++;
}
public void TerminateProcess(uint pId, uint exitCode)
{
var process = _processes[pId];
foreach (var page in process.PageTable)
{
Ram.Free(page);
}
process.ExitCode = exitCode;
process.IsRunning = false;
}
public void Exit(uint exitCode)
{
CurrentProcess.ExitCode = exitCode;
CurrentProcess.IsRunning = false;
foreach (var page in CurrentProcess.PageTable)
{
Ram.Free(page);
}
CurrentProcess = null;
}
public void Free(uint offset)
{
var page = CurrentProcess.PageTable.Find(x => x.Offset == offset);
if (page != null)
{
foreach (var p in page.Pages)
{
Ram.Free(p);
}
CurrentProcess.PageTable.Free(page);
}
}
public void Free()
{
var ram = new Ram(2, 1);
var pcb = new ProcessContextBlock { Id = 1 };
var frame = ram.Allocate(pcb);
Assert.That(frame, Is.Not.Null);
frame = ram.Allocate(pcb);
Assert.That(frame, Is.Not.Null);
ram.Free(frame);
frame = ram.Allocate(pcb);
Assert.That(frame, Is.Not.Null);
}