问题描述
我有一个 cpu 调度程序学校项目，幸运的是能够从 GitHub 找到一个示例程序。
但是它缺少 SJF preemtive 或 SRT。
SJF 表格：
这是 SJF 代码：
using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows.Forms;
namespace cpu_Scheduling
{
public partial class SJF : Form
{
public SJF()
{
InitializeComponent();
picBusy.Hide();
picWaiting.Show();
}
public bool ran = false;
public int Numpro;
public int Max;
public int Min;
private int currentTime = -1;
private int totalTurnarroundTime = 0;
private int totalWaitingTime = 0;
private bool enabled = false;
Random rand = new Random();
private int normal(double mean,double stdDev,int max,int min)
{
int k = max + 1;
while (k > max || k < min)
{
double u1 = 1.0 - rand.NextDouble(); //uniform(0,1] random doubles
double u2 = 1.0 - rand.NextDouble();
double randStdnormal = Math.Sqrt(-2.0 * Math.Log(u1)) *
Math.Sin(2.0 * Math.PI * u2); //random normal(0,1)
double randnormal = mean + stdDev * randStdnormal; //random normal(mean,stdDev^2)
k = (int)Math.Floor(randnormal);
}
return k;
}
Process[] prolist;
private List<Process> ArrivalQueue = new List<Process>();
private List<Process> ReadyQueue = new List<Process>();
Process runProcess = null;
ProgressBar bar = new ProgressBar();
int[] Remain;
public void populate()
{
prolist = new Process[Numpro];
Remain = new int[Numpro];
for (int i = 0; i < Numpro; ++i)
{
prolist[i] = new Process();
double mean = (double)(Max + Min) / (double)2;
double stdDev = (double)(Max - Min) / (double)6;
prolist[i].Num = i;
prolist[i].Arrival = (ran) ? normal(mean,stdDev,Max,Min) : 0;
prolist[i].Burst = (ran) ? normal(mean,Min) : 1;
flowLayoutPanel1.Controls.Add(prolist[i]);
}
}
private void EnqueueByArrival(Process process,List<Process> queue)
{
if (queue.Count > 0)
{
for (int i = 0; i < queue.Count; ++i)
{
if (process.Arrival < queue[i].Arrival)
{
queue.Insert(i,process);
return;
}
}
}
queue.Add(process);
}
private void EnqueueByBurst(Process process,List<Process> queue)
{
if (queue.Count > 0)
{
for (int i = 0; i < queue.Count; ++i)
{
if (process.Burst < queue[i].Burst)
{
queue.Insert(i,process);
return;
}
}
}
queue.Add(process);
}
private Process Dequeue(List<Process> queue)
{
if (queue.Count > 0)
{
Process process = queue[0];
queue.RemoveAt(0);
return process;
}
else return null;
}
private void btnStart_Click(object sender,EventArgs e)
{
if (enabled) return;
enabled = true;
flowLayoutPanel1.Enabled = false;
foreach (Process process in prolist)
{
int temp = process.Arrival;
Remain[process.Num] = process.Burst;
EnqueueByArrival(process,ArrivalQueue);
}
timer1.Start();
}
private void timer1_Tick(object sender,EventArgs e)
{
currentTime++;
while (ArrivalQueue.Count > 0 && ArrivalQueue[0].Arrival == currentTime)
{
Process temp = Dequeue(ArrivalQueue);
EnqueueByBurst(temp,ReadyQueue);
}
if (runProcess != null && Remain[runProcess.Num] == 0)
{
runProcess.setWait(currentTime - runProcess.Burst - runProcess.Arrival);
totalWaitingTime += currentTime - runProcess.Burst - runProcess.Arrival;
totalTurnarroundTime += currentTime - runProcess.Arrival;
runProcess = null;
}
if (runProcess == null && ReadyQueue.Count > 0)
{
runProcess = Dequeue(ReadyQueue);
runProcess.proStatus.Maximum = runProcess.Burst;
int i = tableLayoutPanel1.ColumnCount++;
Label k1 = new Label();
k1.AutoSize = true;
k1.Text = "P" + runProcess.Num.ToString();
tableLayoutPanel1.Controls.Add(k1,i - 1,0);
bar = new ProgressBar();
bar.Width = 25 * runProcess.Burst;
bar.Maximum = runProcess.Burst;
tableLayoutPanel1.Controls.Add(bar,1);
Label k2 = new Label();
k2.AutoSize = true;
k2.Text = currentTime.ToString();
tableLayoutPanel1.Controls.Add(k2,2);
}
if (runProcess != null)
{
Remain[runProcess.Num] -= 1;
runProcess.proStatus.Value += 1;
bar.Value += 1;
}
if (runProcess == null && ArrivalQueue.Count == 0 && ReadyQueue.Count == 0)
{
timer1.Stop();
lbWaitT.Text = Math.Round((double)totalWaitingTime / (double)Numpro,2).ToString();
lbTurn.Text = Math.Round((double)totalTurnarroundTime / (double)Numpro,2).ToString();
}
lbClock.Text = currentTime.ToString();
lbQueue.Text = ReadyQueue.Count.ToString();
lbStatus.Text = (runProcess == null) ? "Idle" : "Busy";
lbCurrent.Text = "P" + ((runProcess == null) ? "" : runProcess.Num.ToString());
String waitingProcesses = "";
foreach (Process process in ReadyQueue)
{
waitingProcesses += ("P" + process.Num.ToString() + "|");
}
lbWait.Text = waitingProcesses;
if (runProcess == null) { picBusy.Hide(); picWaiting.Show(); }
else { picBusy.Show(); picWaiting.Hide(); }
}
private void btnRestart_Click(object sender,EventArgs e)
{
enabled = false;
flowLayoutPanel1.Enabled = true;
picBusy.Hide(); picWaiting.Show();
lbClock.Text = "0";
lbQueue.Text = "0";
lbStatus.Text = "Idle";
lbCurrent.Text = "P";
lbTurn.Text = "0";
lbWaitT.Text = "0";
flowLayoutPanel1.Controls.Clear();
for (int i = tableLayoutPanel1.Controls.Count - 1; i >= 0; --i)
tableLayoutPanel1.Controls[i].dispose();
tableLayoutPanel1.Controls.Clear();
tableLayoutPanel1.ColumnStyles.Clear();
tableLayoutPanel1.ColumnCount = 1;
for (int i = 0; i < Numpro; i++)
{
prolist[i].stop();
flowLayoutPanel1.Controls.Add(prolist[i]);
}
timer1.Stop();
ArrivalQueue = new List<Process>();
ReadyQueue = new List<Process>();
currentTime = -1;
bar = new ProgressBar();
runProcess = null;
totalTurnarroundTime = 0;
totalWaitingTime = 0;
}
private void SJF_Load(object sender,EventArgs e)
{
this.FormClosed += new FormClosedEventHandler(formclose);
}
private void formclose(object sender,EventArgs e)
{
EntryForm k = new EntryForm();
k.Show();
}
}
}
来自 GitHub 的完整 C# 程序：link
请帮助将 SJF 代码转换为 preemtive/SRT，我是一个完全的新手，不完全理解代码。谢谢！
解决方法
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