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);
}
public void CreateShared()
{
var ram = new Ram(1024, 256);
var offset = ram.AllocateShared(512);
Assert.That(offset, Is.EqualTo(0));
var pcb = new ProcessContextBlock {Id = 10};
var p1 = ram.Allocate(pcb);
var p2 = ram.Allocate(pcb);
var p1Offset = ram.ToPhysicalAddress(10, p1.VirtualAddress);
var p2Offset = ram.ToPhysicalAddress(10, p2.VirtualAddress);
Assert.That(p1Offset, Is.GreaterThan(offset));
Assert.That(p2Offset, Is.GreaterThan(offset));
Assert.That(p2Offset, Is.GreaterThan(p1Offset));
}
public void Allocate()
{
var ram = new Ram(2, 1);
var pcb = new ProcessContextBlock { Id = 1 };
var page = ram.Allocate(pcb);
Assert.That(page, Is.Not.Null);
Assert.That(page.PageNumber, Is.Not.EqualTo(0));
page = ram.Allocate(pcb);
Assert.That(page, Is.Not.Null);
Assert.That(page.PageNumber, Is.Not.EqualTo(0));
page = ram.Allocate(pcb);
Assert.That(page, Is.Null);
}
public void Write()
{
var buffer = new byte[] {1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12 };
const uint frameSize = 4;
var ram = new Ram(buffer, frameSize);
var pageSet = new PageInfo();
var pcb = new ProcessContextBlock {Id = 1};
ram.Allocate(pcb);
pageSet.Append(ram.Allocate(pcb));
pageSet.Append(ram.Allocate(pcb));
var pageStream = new PageStream(ram, pageSet);
Assert.That(pageStream.Length, Is.EqualTo(8));
var b = new byte[] { 91, 92, 93, 94, };
pageStream.Position = 2;
pageStream.Write(b, 0, 4);
Assert.That(buffer, Is.EquivalentTo(new[] { 1, 2, 3, 4, 5, 6, 91, 92, 93, 94, 11, 12, }));
}
public void Read()
{
var buffer = new byte[] { 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12 };
const uint frameSize = 4;
var ram = new Ram(buffer, frameSize);
var pageSet = new PageInfo();
var pcb = new ProcessContextBlock {Id = 1};
ram.Allocate(pcb);
pageSet.Append(ram.Allocate(pcb));
pageSet.Append(ram.Allocate(pcb));
var pageStream = new PageStream(ram, pageSet);
Assert.That(pageStream.Length, Is.EqualTo(8));
var b = new byte[6];
pageStream.Read(b, 0, 6);
Assert.That(pageStream.Position, Is.EqualTo(6));
Assert.That(b, Is.EquivalentTo(new[] { 5, 6, 7, 8, 9, 10 }));
}
public uint Allocate(uint size)
{
var page = new PageInfo();
while (size > Ram.FrameSize)
{
size -= Ram.FrameSize;
page.Append(Ram.Allocate(CurrentProcess));
}
page.Append(Ram.Allocate(CurrentProcess));
CurrentProcess.PageTable.Add(page);
return(page.Offset);
}
public Stream AllocateCodeBlock(ProcessContextBlock pcb, uint length)
{
var page = new PageInfo();
while (length > Ram.FrameSize)
{
length -= Ram.FrameSize;
page.Append(Ram.Allocate(pcb));
}
page.Append(Ram.Allocate(pcb));
pcb.Code = page;
return(GetMemoryStream(page));
}
public void Run(ProcessContextBlock block)
{
if (block == null)
{
throw new ArgumentNullException(nameof(block));
}
block.Stack.Append(Ram.Allocate(block));
block.GlobalData.Append(Ram.Allocate(block));
block.Registers[Register.G] = block.Id;
block.Registers[Register.H] = block.GlobalData.Offset;
_processes.Add(block.Id, block);
ReadyQueue.Enqueue(block);
block.IsRunning = true;
}
