?? tfprocessschedule.java
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package cn.edu.cauc.crab.ossimulate;import java.util.*;import javax.swing.*;/** * <p>Title: OS simulate</p> * <p>Description: This is my home work.</p> * <p>Copyright: Copyleft (c) 2004</p> * <p>Company: CAUC</p> * @author Crab * @version 0.1 *//** * To simulate time fragment scheduling. * * @author Crab * @version 0.1 * @see cn.edu.cauc.crab.ossimulate.ProcessSchdule */public class TFProcessSchedule extends ProcessSchedule { JTextArea out; private int timeFragment; /** * extend from ProcessSchdule a List PCBs. * @param timeFragment the time fragment to schedule the process. */ public TFProcessSchedule(int timeFragment) { super(); this.timeFragment = timeFragment; } public TFProcessSchedule(int timeFragment, JTextArea out) { super(); this.timeFragment = timeFragment; this.out = out; } /** * extends from ProcessSchedule * After addProcess() is calling, * use to start scheduling. */ public void start() { int time = 0; while (!PCBs.isEmpty()) { Iterator p = PCBs.iterator(); while (p.hasNext()) { PCB tempPCB = (PCB)p.next(); if (tempPCB.arriveTime <= time) { if (tempPCB.leftTime == tempPCB.serveTime) { tempPCB.beginTime = time; } if (tempPCB.leftTime >= timeFragment) { tempPCB.leftTime -= timeFragment; time += timeFragment; if (tempPCB.leftTime == 0) { tempPCB.finishTime = time; } } else { time += tempPCB.leftTime; tempPCB.finishTime = time; tempPCB.leftTime = 0; } if (tempPCB.leftTime == 0) { tempPCB.rollTime = tempPCB.finishTime - tempPCB.arriveTime; // use tr ts to rise the precesion. float tr = tempPCB.rollTime; float ts = tempPCB.serveTime; tempPCB.nullWorkRate = tr / ts; if (out == null) { System.out.println("PID: " + tempPCB.pid +" Arrive: " + tempPCB.arriveTime + " Serve: " + tempPCB.serveTime + " Begin: " + tempPCB.beginTime + " Finish: " + tempPCB.finishTime + " Roll: " + tempPCB.rollTime + " nullWorkRate: " + tempPCB.nullWorkRate); } else { out.append("標識：" + tempPCB.pid +" 到達時間：" + tempPCB.arriveTime + " 服務時間：" + tempPCB.serveTime + " 開始時間：" + tempPCB.beginTime + " 結束時間：" + tempPCB.finishTime + " 周轉時間：" + tempPCB.rollTime + " 帶權周轉時間: " + tempPCB.nullWorkRate + "\n"); } p.remove();//remove the finish process. } else { if (out == null) { System.out.println("@PID: " + tempPCB.pid + " LeftTime: " + tempPCB.leftTime); } else { out.append("時間片分配 標識：" + tempPCB.pid + " 剩余時間：" + tempPCB.leftTime + "\n"); } } } else { time ++; } } } } public static void main(String[] args) { ProcessSchedule pSch = new TFProcessSchedule(3); //pSch.addProcess(new Process(10), 0); pSch.addProcess(new Process(10), 1); pSch.addProcess(new Process(10), 2); pSch.addProcess(new Process(10), 3); pSch.addProcess(new Process(10), 4); pSch.start(); }}?? 快捷鍵說明
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