多级反馈队列调度算法c语言

实现的关键在于循环遍历多个队列，同时需要实现时间片轮转的功能。下面是一个简单的多级反馈队列调度算法的C语言实现示例：

#include <stdio.h>

struct process {
    int id;
    int arrival_time;
    int burst_time;
    int priority;
    int waiting_time;
    int turnaround_time;
    int remaining_time;
};

int quantum[] = {1, 2, 4};
int n_queues = 3;
int n_processes;
struct process process_list[100];

void schedule() {
    int t = 0;
    int completed = 0;
    int queue[100];
    int head[n_queues], tail[n_queues];
    for (int i = 0; i < n_queues; i++) {
        head[i] = -1;
        tail[i] = -1;
    }
    for (int i = 0; i < n_processes; i++) {
        if (process_list[i].arrival_time == 0) {
            queue[++tail[0]] = i;
        }
    }
    while (completed < n_processes) {
        int current = -1;
        for (int i = 0; i < n_queues; i++) {
            if (head[i] <= tail[i]) {
                current = queue[head[i]];
                break;
            }
        }
        if (current < 0) {
            printf("Error: No valid process found at time %d.\n", t);
            break;
        }
        int q = 0;
        while (q < n_queues && process_list[current].remaining_time <= quantum[q]) {
            q++;
        }
        int remaining = process_list[current].remaining_time - quantum[q-1];
        t += quantum[q-1];
        process_list[current].remaining_time = remaining;
        process_list[current].priority = q;
        if (remaining > 0) {
            queue[++tail[q]] = current;
            head[q] = (head[q] < 0) ? tail[q] : head[q];
        } else {
            completed++;
            int wait_time = t - process_list[current].arrival_time - process_list[current].burst_time;
            int turn_time = t - process_list[current].arrival_time;
            process_list[current].waiting_time = wait_time;
            process_list[current].turnaround_time = turn_time;
            head[q]++;
        }
    }
}

int main() {
    printf("Enter the number of processes:\n");
    scanf("%d", &n_processes);
    printf("Enter arrival time, burst time and priority for each process:\n");
    for (int i = 0; i < n_processes; i++) {
        scanf("%d%d%d", &process_list[i].arrival_time, &process_list[i].burst_time, &process_list[i].priority);
        process_list[i].id = i+1;
        process_list[i].remaining_time = process_list[i].burst_time;
    }
    schedule();
    printf("Process\tArrival\tBurst\tPriority\tWait\tTurnaround\n");
    for (int i = 0; i < n_processes; i++) {
        printf("%d\t%d\t%d\t%d\t%d\t%d\n", process_list[i].id, process_list[i].arrival_time, process_list[i].burst_time, process_list[i].priority, process_list[i].waiting_time, process_list[i].turnaround_time);
    }
    return 0;
}

请问你还有什么问题？