private void repaintPanel()
{
Graphics g = memory_panel.CreateGraphics();
memory_panel.Show();
for (int freeindex = 0; freeindex < freespace.Count; freeindex++)
{
SpaceNode nowNode = (SpaceNode)freespace[freeindex];
g.FillRectangle((Brush)Brushes.Green,
0, (int)((double)(nowNode.begin - 1) / memory_size * memory_panel.Height),
memory_panel.Width, (int)((double)nowNode.capacity / memory_size * memory_panel.Height));
g.DrawLine(new Pen(Color.Black, 2),
new Point(0, (int)((double)nowNode.end / memory_size * memory_panel.Height)),
new Point(memory_panel.Width, (int)((double)nowNode.end / memory_size * memory_panel.Height)));
g.DrawString(String.Format("FREE MEMORY:{0} BYTE", nowNode.capacity),
Font, (Brush)Brushes.Black,
memory_panel.Width / 2 - 50,
(int)((double)(nowNode.begin - 1) / memory_size * memory_panel.Height) + (int)((double)nowNode.capacity / memory_size * memory_panel.Height) / 2 - 4);
}
for (int usedindex = 0; usedindex < usedspace.Count; usedindex++)
{
SpaceNode nowNode = (SpaceNode)usedspace[usedindex];
g.FillRectangle((Brush)Brushes.Red,
0, (int)((double)(nowNode.begin - 1) / memory_size * memory_panel.Height),
memory_panel.Width, (int)((double)nowNode.capacity / memory_size * memory_panel.Height));
g.DrawLine(new Pen(Color.Black, 2),
new Point(0, (int)((double)nowNode.end / memory_size * memory_panel.Height)),
new Point(memory_panel.Width, (int)((double)nowNode.end / memory_size * memory_panel.Height)));
g.DrawString(String.Format("{0} USE MEMORY:{1} BYTE", nowNode.jobname, nowNode.capacity),
Font, (Brush)Brushes.Black,
memory_panel.Width / 2 - 60,
(int)((double)(nowNode.begin - 1) / memory_size * memory_panel.Height) + (int)((double)nowNode.capacity / memory_size * memory_panel.Height) / 2 - 4);
}
}
private void start_button_Click(object sender, EventArgs e)
{
string algorithm_string = algorithm_choose_box.Text;
if (!algorithm_string.Equals("首次适应算法") && !algorithm_string.Equals("最佳适应算法"))
{
MessageBox.Show("请选择首次适应算法或最佳适应算法！");
return;
}
string s = instruction.ReadLine();
if (s == null)
{
MessageBox.Show("文件已读取完毕！");
return;
}
Regex pattern = new Regex(@"^(?<jobname>\w+) (?<operation>alloc|free) (?<size>\d+)$");
if (!pattern.IsMatch(s))
{
MessageBox.Show("无效指令，请检查文件！");
return;
}
if (!started)
{
started = true;
}
Match match = pattern.Match(s);
string jobname = match.Groups["jobname"].Value;
string operation = match.Groups["operation"].Value;
int size = Convert.ToInt32(match.Groups["size"].Value);
if (operation.Equals("alloc"))
{
for (int i = 0; i < usedspace.Count; i++)
{
if (((SpaceNode)usedspace[i]).jobname.Equals(jobname))
{
MessageBox.Show(String.Format("指令{0}非法！已有同名任务存在于内存中，将执行下一条指令", s));
instruction_displayer.Text += s + " [failed]" + '\n';
return;
}
}
Algorithm method = algorithm_string.Equals("首次适应算法") ? Algorithm.FIRSTFIT : Algorithm.BESTFIT;
int index = -1;
if (method == Algorithm.FIRSTFIT)
{
int begin = memory_size + 10;
for (int i = 0; i < freespace.Count; i++)
{
if (((SpaceNode)freespace[i]).capacity >= size && ((SpaceNode)freespace[i]).begin < begin)
{
begin = ((SpaceNode)freespace[i]).begin;
index = i;
}
}
}
if (method == Algorithm.BESTFIT)
{
int min_capacity = memory_size + 10;
for (int i = 0; i < freespace.Count; i++)
{
if (((SpaceNode)freespace[i]).capacity >= size && ((SpaceNode)freespace[i]).capacity < min_capacity)
{
min_capacity = ((SpaceNode)freespace[i]).capacity;
index = i;
}
}
}
if (index == -1)
{
MessageBox.Show(String.Format("内存不足，指令{0}执行失败，将执行下一条指令", s));
instruction_displayer.Text += s + " [failed]" + '\n';
return;
}
usedspace.Add(new SpaceNode(((SpaceNode)freespace[index]).begin, ((SpaceNode)freespace[index]).begin + size - 1, size, jobname));
((SpaceNode)freespace[index]).capacity -= size;
((SpaceNode)freespace[index]).begin += size;
if (((SpaceNode)freespace[index]).begin == ((SpaceNode)freespace[index]).end + 1)
{
freespace.RemoveAt(index);
}
}
if (operation.Equals("free"))
{
int usedindex = -1;
for (int i = 0; i < usedspace.Count; i++)
{
if (((SpaceNode)usedspace[i]).jobname.Equals(jobname))
{
usedindex = i;
break;
}
}
if (usedindex == -1)
{
MessageBox.Show(String.Format("在内存中寻找不到{0}，指令{1}执行失败，将执行下一条指令", jobname, s));
instruction_displayer.Text += s + " [failed]" + '\n';
return;
}
if (((SpaceNode)usedspace[usedindex]).capacity == size)
{
freespace.Add(new SpaceNode(((SpaceNode)usedspace[usedindex]).begin,
((SpaceNode)usedspace[usedindex]).end, ((SpaceNode)usedspace[usedindex]).capacity));
usedspace.RemoveAt(usedindex);
}
else
{
freespace.Add(new SpaceNode(((SpaceNode)usedspace[usedindex]).begin,
((SpaceNode)usedspace[usedindex]).begin + size - 1, size));
((SpaceNode)usedspace[usedindex]).begin += size;
((SpaceNode)usedspace[usedindex]).capacity -= size;
}
freespace.Sort(new SortWithBeginTime());
for (int i = 1; i < freespace.Count; i++)
{
SpaceNode preNode = (SpaceNode)freespace[i - 1];
SpaceNode nowNode = (SpaceNode)freespace[i];
if (preNode.end + 1 == nowNode.begin)
{
preNode.end = nowNode.end;
preNode.capacity += nowNode.capacity;
freespace.RemoveAt(i);
i--;
}
}
}
memory_panel.CreateGraphics().Clear(Color.FromArgb(255, 255, 255, 255));
repaintPanel();
instruction_displayer.Text += s + '\n';
}