c语言实现银行家算法的代码

银行家算法是一种避免死锁的算法，C语言实现银行家算法的代码如下：

#include <stdio.h>
#include <stdbool.h>

#define MAX_PROCESS 10
#define MAX_RESOURCE 10

int n, m;
int available[MAX_RESOURCE];
int maximum[MAX_PROCESS][MAX_RESOURCE];
int allocation[MAX_PROCESS][MAX_RESOURCE];
int need[MAX_PROCESS][MAX_RESOURCE];
bool finish[MAX_PROCESS];

bool is_safe() {
    int work[MAX_RESOURCE];
    for (int i = 0; i < m; i++) {
        work[i] = available[i];
    }
    bool finish[MAX_PROCESS] = {false};
    int safe_sequence[MAX_PROCESS], count = 0;

    while (count < n) {
        bool found = false;
        for (int i = 0; i < n; i++) {
            if (!finish[i]) {
                bool can_allocate = true;
                for (int j = 0; j < m; j++) {
                    if (need[i][j] > work[j]) {
                        can_allocate = false;
                        break;
                    }
                }
                if (can_allocate) {
                    finish[i] = true;
                    safe_sequence[count++] = i;
                    found = true;
                    for (int j = 0; j < m; j++) {
                        work[j] += allocation[i][j];
                    }
                }
            }
        }
        if (!found) {
            return false;
        }
    }

    printf("Safe sequence: ");
    for (int i = 0; i < n; i++) {
        printf("%d ", safe_sequence[i]);
    }
    printf("\n");
    return true;
}

void request_resources(int process_id, int request[]) {
    bool can_allocate = true;
    for (int i = 0; i < m; i++) {
        if (request[i] > need[process_id][i] || request[i] > available[i]) {
            can_allocate = false;
            break;
        }
    }

    if (can_allocate) {
        for (int i = 0; i < m; i++) {
            available[i] -= request[i];
            allocation[process_id][i] += request[i];
            need[process_id][i] -= request[i];
        }

        if (is_safe()) {
            printf("Request is satisfied.\n");
        } else {
            printf("Request is denied.\n");
            for (int i = 0; i < m; i++) {
                available[i] += request[i];
                allocation[process_id][i] -= request[i];
                need[process_id][i] += request[i];
            }
        }
    } else {
        printf("Request is denied.\n");
    }
}

int main() {
    printf("Enter the number of processes: ");
    scanf("%d", &n);

    printf("Enter the number of resources: ");
    scanf("%d", &m);

    printf("Enter the number of available resources:\n");
    for (int i = 0; i < m; i++) {
        scanf("%d", &available[i]);
    }

    printf("Enter the maximum demand of each process:\n");
    for (int i = 0; i < n; i++) {
        for (int j = 0; j < m; j++) {
            scanf("%d", &maximum[i][j]);
            need[i][j] = maximum[i][j];
        }
    }

    printf("Enter the allocated resources of each process:\n");
    for (int i = 0; i < n; i++) {
        for (int j = 0; j < m; j++) {
            scanf("%d", &allocation[i][j]);
            need[i][j] -= allocation[i][j];
        }
    }

    is_safe();

    int process_id;
    printf("Enter process ID to request resources: ");
    scanf("%d", &process_id);

    int request[MAX_RESOURCE];
    printf("Enter the requested resources:\n");
    for (int i = 0; i < m; i++) {
        scanf("%d", &request[i]);
    }

    request_resources(process_id, request);

    return 0;
}

该代码实现了银行家算法的主要功能，包括判断系统是否处于安全状态以及处理进程请求资源。需要注意的是，此代码仅供参考，实际使用时需要根据具体情况进行修改和完善。