用请求页式管理中的页面置换算法模拟存储器管理编写程序并运行

以下是使用请求页式管理中的页面置换算法模拟存储器管理的C++程序示例：

#include <iostream>
#include <vector>
#include <algorithm>

using namespace std;

// 定义页表项
struct PageTableEntry {
    int page_number;  // 页号
    int frame_number; // 帧号，-1表示未分配
    int reference;    // 参考位，0或1
    int modify;       // 修改位，0或1
};

// 定义页面置换算法类
class PageReplacementAlgorithm {
public:
    virtual int getReplacePage() = 0; // 获取要置换的页面
    virtual void updatePageTable(PageTableEntry& page_table_entry) = 0; // 更新页表
};

// 定义FIFO页面置换算法类
class FIFOPageReplacementAlgorithm : public PageReplacementAlgorithm {
public:
    FIFOPageReplacementAlgorithm(int frame_count) {
        frame_count_ = frame_count;
        frame_index_ = 0;
        page_frames_.resize(frame_count_, -1);
    }
    
    int getReplacePage() override {
        int replace_page = page_frames_[frame_index_];
        frame_index_ = (frame_index_ + 1) % frame_count_;
        return replace_page;
    }
    
    void updatePageTable(PageTableEntry& page_table_entry) override {
        page_frames_[frame_index_] = page_table_entry.frame_number;
    }
    
private:
    int frame_count_;
    int frame_index_;
    vector<int> page_frames_;
};

// 定义LRU页面置换算法类
class LRUPageReplacementAlgorithm : public PageReplacementAlgorithm {
public:
    LRUPageReplacementAlgorithm(int frame_count) {
        frame_count_ = frame_count;
        page_frames_.resize(frame_count_, -1);
    }
    
    int getReplacePage() override {
        int replace_page = page_frames_.back();
        page_frames_.pop_back();
        return replace_page;
    }
    
    void updatePageTable(PageTableEntry& page_table_entry) override {
        int frame_number = page_table_entry.frame_number;
        auto iter = find(page_frames_.begin(), page_frames_.end(), frame_number);
        if (iter != page_frames_.end()) {
            page_frames_.erase(iter);
        }
        page_frames_.insert(page_frames_.begin(), frame_number);
    }
    
private:
    int frame_count_;
    vector<int> page_frames_;
};

// 定义存储器管理类
class MemoryManager {
public:
    MemoryManager(int page_count, int frame_count, PageReplacementAlgorithm* page_replacement_algorithm) {
        page_count_ = page_count;
        frame_count_ = frame_count;
        page_replacement_algorithm_ = page_replacement_algorithm;
        page_table_.resize(page_count_);
        for (int i = 0; i < page_count_; i++) {
            page_table_[i].page_number = i;
            page_table_[i].frame_number = -1;
            page_table_[i].reference = 0;
            page_table_[i].modify = 0;
        }
        frame_table_.resize(frame_count_, -1);
    }
    
    void accessPage(int page_number, bool modify) {
        PageTableEntry& page_table_entry = page_table_[page_number];
        if (page_table_entry.frame_number == -1) {
            // 未分配帧，需要置换页面
            int replace_page = page_replacement_algorithm_->getReplacePage();
            int replace_frame = frame_table_[replace_page];
            if (replace_frame != -1) {
                // 释放帧
                frame_table_[replace_page] = -1;
                page_table_[replace_page].frame_number = -1;
                page_table_[replace_page].reference = 0;
                page_table_[replace_page].modify = 0;
            }
            // 分配帧
            page_table_entry.frame_number = replace_frame;
            page_table_entry.reference = 1;
            page_table_entry.modify = modify ? 1 : 0;
            frame_table_[page_number] = replace_frame;
            page_replacement_algorithm_->updatePageTable(page_table_entry);
        } else {
            // 已分配帧，更新参考位和修改位
            page_table_entry.reference = 1;
            if (modify) {
                page_table_entry.modify = 1;
            }
        }
    }
    
    void printPageTable() {
        cout << "Page Table:" << endl;
        cout << "Page Number\tFrame Number\tReference\tModify" << endl;
        for (int i = 0; i < page_count_; i++) {
            PageTableEntry& page_table_entry = page_table_[i];
            cout << i << "\t\t" << page_table_entry.frame_number << "\t\t" << page_table_entry.reference << "\t\t" << page_table_entry.modify << endl;
        }
    }
    
private:
    int page_count_;
    int frame_count_;
    vector<PageTableEntry> page_table_;
    vector<int> frame_table_;
    PageReplacementAlgorithm* page_replacement_algorithm_;
};

// 测试程序
int main() {
    int page_count = 10;
    int frame_count = 4;
    PageReplacementAlgorithm* page_replacement_algorithm = new LRUPageReplacementAlgorithm(frame_count);
    MemoryManager memory_manager(page_count, frame_count, page_replacement_algorithm);
    // 访问页面
    memory_manager.accessPage(0, false);
    memory_manager.accessPage(1, false);
    memory_manager.accessPage(2, false);
    memory_manager.accessPage(3, false);
    memory_manager.accessPage(4, false);
    memory_manager.accessPage(5, false);
    memory_manager.accessPage(6, false);
    memory_manager.accessPage(7, false);
    memory_manager.accessPage(8, false);
    memory_manager.accessPage(9, false);
    memory_manager.accessPage(0, true);
    memory_manager.accessPage(1, true);
    memory_manager.printPageTable();
    return 0;
}

该程序实现了请求页式管理中的页面置换算法，包括FIFO和LRU两种算法。程序先创建一个MemoryManager对象，然后通过访问页面来测试程序。最后输出页面表的内容。

需要注意的是，该程序仅为示例代码，实际应用中需要根据具体情况进行修改和优化。