动态优先权算法模拟实验
时间: 2023-07-10 14:09:08 浏览: 56
动态优先权算法是一种用于进程调度的算法,其基本思想是根据进程的优先级来进行进程调度。在这种算法中,每个进程都被赋予一个优先级,优先级越高的进程越先被调度。
下面是一个简单的动态优先权算法模拟实验:
首先,我们需要定义一个进程的数据结构,包含进程的ID、到达时间、服务时间和优先级:
```
struct Process {
int id;
int arrival_time;
int service_time;
int priority;
};
```
接下来,我们需要编写一个函数,用于根据进程的到达时间将进程按顺序添加到等待队列中:
```
void addProcessToQueue(int currentTime, vector<Process>& processes, queue<Process>& waitingQueue) {
for (int i = 0; i < processes.size(); i++) {
if (processes[i].arrival_time == currentTime) {
waitingQueue.push(processes[i]);
}
}
}
```
然后,我们需要编写一个函数,用于根据进程的优先级从等待队列中选择一个进程进行调度:
```
Process selectProcessToSchedule(queue<Process>& waitingQueue) {
Process selectedProcess = waitingQueue.front();
queue<Process> tempQueue = waitingQueue;
while (!tempQueue.empty()) {
Process currentProcess = tempQueue.front();
tempQueue.pop();
if (currentProcess.priority > selectedProcess.priority) {
selectedProcess = currentProcess;
}
}
return selectedProcess;
}
```
接下来,我们需要编写一个函数,用于模拟进程的执行过程,并更新等待队列中的进程优先级:
```
void executeProcess(Process& process, int currentTime, vector<Process>& processes, queue<Process>& waitingQueue) {
process.service_time--;
if (process.service_time == 0) {
for (int i = 0; i < processes.size(); i++) {
if (processes[i].id != process.id && processes[i].arrival_time <= currentTime && waitingQueue.front().priority < processes[i].priority) {
processes[i].priority--;
}
}
waitingQueue.pop();
} else {
for (int i = 0; i < processes.size(); i++) {
if (processes[i].id != process.id && processes[i].arrival_time <= currentTime && waitingQueue.front().priority <= processes[i].priority) {
processes[i].priority++;
}
}
waitingQueue.pop();
waitingQueue.push(process);
}
}
```
最后,我们需要编写一个函数,用于模拟整个进程调度过程:
```
void simulate(int numProcesses, vector<Process>& processes) {
queue<Process> waitingQueue;
int currentTime = 0;
while (!waitingQueue.empty() || currentTime == 0) {
addProcessToQueue(currentTime, processes, waitingQueue);
if (!waitingQueue.empty()) {
Process selectedProcess = selectProcessToSchedule(waitingQueue);
executeProcess(selectedProcess, currentTime, processes, waitingQueue);
cout << "Time " << currentTime << ": Process " << selectedProcess.id << " executed." << endl;
} else {
cout << "Time " << currentTime << ": Processor idle." << endl;
}
currentTime++;
}
}
```
使用上述函数,我们可以模拟动态优先权算法的执行过程,从而更好地理解该算法的工作原理。