用java构建一个随机混合系统的LCFS——PS情况
时间: 2024-01-16 17:19:06 浏览: 45
LCFS-PS(Last-Come-First-Served with Preemption)是一种调度算法,它结合了LCFS(Last-Come-First-Served)和PS(Preemptive Scheduling)两种调度策略。LCFS-PS的特点是在LCFS的基础上,当一个新的进程到达时,如果它的优先级高于当前正在运行的进程,则会抢占当前进程的CPU资源。
下面是一个用Java构建随机混合系统的LCFS-PS调度算法的示例代码:
```java
import java.util.*;
class Process {
private String name;
private int arrivalTime;
private int burstTime;
private int priority;
public Process(String name, int arrivalTime, int burstTime, int priority) {
this.name = name;
this.arrivalTime = arrivalTime;
this.burstTime = burstTime;
this.priority = priority;
}
public String getName() {
return name;
}
public int getArrivalTime() {
return arrivalTime;
}
public int getBurstTime() {
return burstTime;
}
public int getPriority() {
return priority;
}
}
public class LCFS_PS_Scheduler {
public static void main(String[] args) {
List<Process> processes = new ArrayList<>();
processes.add(new Process("P1", 0, 5, 2));
processes.add(new Process("P2", 1, 3, 1));
processes.add(new Process("P3", 2, 4, 3));
processes.add(new Process("P4", 3, 2, 2));
// 按照到达时间排序
processes.sort(Comparator.comparing(Process::getArrivalTime));
// 创建一个优先级队列,按照优先级降序排列
PriorityQueue<Process> queue = new PriorityQueue<>(Comparator.comparing(Process::getPriority).reversed());
int currentTime = 0;
while (!processes.isEmpty() || !queue.isEmpty()) {
// 将到达时间小于等于当前时间的进程加入队列
while (!processes.isEmpty() && processes.get(0).getArrivalTime() <= currentTime) {
queue.add(processes.remove(0));
}
if (!queue.isEmpty()) {
Process currentProcess = queue.poll();
System.out.println("Running process: " + currentProcess.getName() + " at time " + currentTime);
currentProcess.burstTime--;
if (currentProcess.burstTime > 0) {
// 如果进程还未执行完,则将其重新加入队列
queue.add(currentProcess);
}
} else {
System.out.println("CPU idle at time " + currentTime);
}
currentTime++;
}
}
}
```
上述代码中,我们首先定义了一个`Process`类来表示进程,包含进程的名称、到达时间、执行时间和优先级。然后在`LCFS_PS_Scheduler`类中,我们创建了一个进程列表,并按照到达时间进行排序。接下来,我们使用优先级队列来模拟LCFS-PS调度算法,每次选择优先级最高的进程执行,如果有新的进程到达且优先级高于当前进程,则进行抢占。最后,我们按照时间顺序输出进程的执行情况。
请注意,上述代码只是一个简单的示例,实际的LCFS-PS调度算法可能会更加复杂,需要考虑更多的因素和细节。此外,还可以根据具体需求进行调整和扩展。
相关推荐
![pdf](https://img-home.csdnimg.cn/images/20210720083512.png)
![zip](https://img-home.csdnimg.cn/images/20210720083736.png)
![zip](https://img-home.csdnimg.cn/images/20210720083736.png)
![zip](https://img-home.csdnimg.cn/images/20210720083736.png)
![pptx](https://img-home.csdnimg.cn/images/20210720083543.png)
![docx](https://img-home.csdnimg.cn/images/20210720083331.png)
![pptx](https://img-home.csdnimg.cn/images/20210720083543.png)
![docx](https://img-home.csdnimg.cn/images/20210720083331.png)
![pdf](https://img-home.csdnimg.cn/images/20210720083512.png)
![zip](https://img-home.csdnimg.cn/images/20210720083736.png)
![zip](https://img-home.csdnimg.cn/images/20210720083736.png)
![rar](https://img-home.csdnimg.cn/images/20210720083606.png)
![zip](https://img-home.csdnimg.cn/images/20210720083736.png)
![7z](https://img-home.csdnimg.cn/images/20210720083312.png)
![rar](https://img-home.csdnimg.cn/images/20210720083606.png)
![sb3](https://img-home.csdnimg.cn/images/20210720083646.png)
![zip](https://img-home.csdnimg.cn/images/20210720083736.png)