计算机操作系统：银行家算法c++

银行家算法是一种用于解决多个进程对多种资源的竞争和分配的算法，它可以避免死锁和资源浪费的情况。下面是一个使用C++实现银行家算法的示例：

#include <iostream>
using namespace std;

const int MAX_PROCESS = 10;
const int MAX_RESOURCE = 10;

int main() {
    int available[MAX_RESOURCE];
    int maxDemand[MAX_PROCESS][MAX_RESOURCE];
    int allocation[MAX_PROCESS][MAX_RESOURCE];
    int need[MAX_PROCESS][MAX_RESOURCE];
    int work[MAX_RESOURCE];
    bool finish[MAX_PROCESS];

    int numProcesses, numResources;

    // 输入进程数和资源数
    cout << "Enter the number of processes: ";
    cin >> numProcesses;
    cout << "Enter the number of resources: ";
    cin >> numResources;

    // 输入可用资源数
    cout << "Enter the number of available resources: ";
    for (int i = 0; i < numResources; i++) {
        cin >> available[i];
    }

    // 输入每个进程的最大需求量
    cout << "Enter the maximum demand of each process: " << endl;
    for (int i = 0; i < numProcesses; i++) {
        cout << "Process " << i << ": ";
        for (int j = 0; j < numResources; j++) {
            cin >> maxDemand[i][j];
        }
    }

    // 输入每个进程已分配的资源量
    cout << "Enter the allocated resources of each process: " << endl;
    for (int i = 0; i < numProcesses; i++) {
        cout << "Process " << i << ": ";
        for (int j = 0; j < numResources; j++) {
            cin >> allocation[i][j];
            need[i][j] = maxDemand[i][j] - allocation[i][j];
        }
        finish[i] = false;
    }

    // 初始化work向量
    for (int i = 0; i < numResources; i++) {
        work[i] = available[i];
    }

    // 找到一个安全序列
    int count = 0;
    int safeSequence[MAX_PROCESS];
    while (count < numProcesses) {
        bool found = false;
        for (int i = 0; i < numProcesses; i++) {
            if (!finish[i]) {
                bool canAllocate = true;
                for (int j = 0; j < numResources; j++) {
                    if (need[i][j] > work[j]) {
                        canAllocate = false;
                        break;
                    }
                }
                if (canAllocate) {
                    for (int j = 0; j < numResources; j++) {
                        work[j] += allocation[i][j];
                    }
                    safeSequence[count++] = i;
                    finish[i] = true;
                    found = true;
                }
            }
        }
        if (!found) {
            break;
        }
    }

    // 输出安全序列
    if (count == numProcesses) {
        cout << "Safe sequence: ";
        for (int i = 0; i < numProcesses; i++) {
            cout << safeSequence[i] << " ";
        }
        cout << endl;
    } else {
        cout << "No safe sequence found." << endl;
    }

    return 0;
}