c++语言编程模拟实现进程调度算法(高响应比优先调度算法)(1)设计一个具有6个并发进程的进程调度程序,时间片自行设定。每个进程用一个进程控制块(PCB)表示。进程控制块一般包含下列信息:进程名,进程到达时间、进程要求服务的时间、进程优先级数、占用CPU的时间以及进程的状态、本次调度的响应比等。具体参数可以根据调度算法的不同进行增删。 (2)每次进行调度时,调度程序应采用高响应比优先算法进行调度。运行时,应能显示和打印:各个进程的PID,状态(运行态“R”、等待态“W”等)和参数(已运行时间/还需运行的时间 等)的变化情况,便于观察进程的调度过程。 (4)所有进程结束后,要打印输出各进程的执行次序,各进程的完成时间,各进程的周转时间及带权周转时间等参数指标,最后必须计算平均周转时间和平均带权周转时间。
时间: 2023-12-03 20:44:22 浏览: 75
这是一个比较复杂的问题,需要实现一个完整的进程调度系统。以下是一个简单的伪代码实现,供参考:
```
#include <iostream>
#include <vector>
#include <algorithm>
using namespace std;
// 进程状态
enum ProcessState {
READY,
RUNNING,
WAITING,
FINISHED
};
// 进程控制块
struct PCB {
string name; // 进程名
int arrival_time; // 到达时间
int service_time; // 要求服务的时间
int priority; // 优先级数
int cpu_time; // 占用CPU的时间
ProcessState state; // 进程状态
double response_ratio; // 响应比
};
// 进程调度器
class Scheduler {
public:
Scheduler(int time_slice) : time_slice_(time_slice) {}
// 添加进程
void add_process(const PCB& process) {
processes_.push_back(process);
}
// 调度进程
void schedule() {
int current_time = 0;
int finished_count = 0;
while (finished_count < processes_.size()) {
// 更新进程响应比
update_response_ratio(current_time);
// 选择响应比最高的进程
int next_process_index = select_next_process();
// 执行进程
PCB& next_process = processes_[next_process_index];
next_process.state = RUNNING;
next_process.cpu_time += min(time_slice_, next_process.service_time - next_process.cpu_time);
current_time += time_slice_;
// 根据执行结果更新进程状态
if (next_process.cpu_time < next_process.service_time) {
next_process.state = READY;
} else {
next_process.state = FINISHED;
next_process.finish_time = current_time;
finished_count++;
}
// 输出进程状态
print_processes(current_time);
}
// 输出统计结果
print_statistics();
}
private:
// 更新进程响应比
void update_response_ratio(int current_time) {
for (PCB& process : processes_) {
if (process.state == READY) {
process.response_ratio = 1.0 + (current_time - process.arrival_time + process.service_time) / process.service_time;
}
}
}
// 选择响应比最高的进程
int select_next_process() {
int next_process_index = -1;
double max_response_ratio = -1.0;
for (int i = 0; i < processes_.size(); i++) {
if (processes_[i].state == READY && processes_[i].response_ratio > max_response_ratio) {
next_process_index = i;
max_response_ratio = processes_[i].response_ratio;
}
}
return next_process_index;
}
// 输出所有进程状态
void print_processes(int current_time) {
cout << "Time: " << current_time << endl;
for (const PCB& process : processes_) {
cout << process.name << " ";
switch(process.state) {
case READY:
cout << "R ";
break;
case RUNNING:
cout << "E ";
break;
case WAITING:
cout << "W ";
break;
case FINISHED:
cout << "F ";
break;
}
cout << process.cpu_time << "/" << process.service_time << " ";
cout << endl;
}
cout << endl;
}
// 输出统计结果
void print_statistics() {
sort(processes_.begin(), processes_.end(), [](const PCB& p1, const PCB& p2) {
return p1.finish_time < p2.finish_time;
});
double total_turnaround_time = 0.0;
double total_weighted_turnaround_time = 0.0;
cout << "Execution order: ";
for (const PCB& process : processes_) {
cout << process.name << " ";
total_turnaround_time += process.finish_time - process.arrival_time;
total_weighted_turnaround_time += (process.finish_time - process.arrival_time) / (double)process.service_time;
}
cout << endl;
cout << "Average turnaround time: " << total_turnaround_time / processes_.size() << endl;
cout << "Average weighted turnaround time: " << total_weighted_turnaround_time / processes_.size() << endl;
}
private:
int time_slice_;
vector<PCB> processes_;
};
int main() {
Scheduler scheduler(2); // 时间片为2
// 添加进程
scheduler.add_process({"A", 0, 8, 3, 0, READY, 0.0});
scheduler.add_process({"B", 1, 4, 1, 0, READY, 0.0});
scheduler.add_process({"C", 2, 9, 3, 0, READY, 0.0});
scheduler.add_process({"D", 3, 5, 2, 0, READY, 0.0});
scheduler.add_process({"E", 4, 2, 1, 0, READY, 0.0});
scheduler.add_process({"F", 5, 7, 2, 0, READY, 0.0});
// 调度进程
scheduler.schedule();
return 0;
}
```
以上代码是一个简单的 C++ 实现,仅供参考。在实际编写中,需要根据具体需求进行修改和完善。
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