使用SPN（最短进程优先）调度算法： 进程|到达时间|执行时间|完成时间|周转时间|带权周转时间 p1|0|5||| p2|2|4||| p3|3|1||| p4|6|2||| 周转时间平均值： 带权周转时间平均值：

SPN（最短进程优先）调度算法是一种根据进程的执行时间来进行调度的算法。它选择执行时间最短的进程优先执行，以减少平均等待时间和平均周转时间。

根据提供的进程信息，我们可以按照SPN调度算法的原则进行计算。

首先，根据到达时间对进程进行排序，以确定它们的执行顺序。然后，按照顺序执行进程，并计算完成时间、周转时间和带权周转时间。

根据提供的进程信息，我们可以得到以下结果：

进程|到达时间|执行时间|完成时间|周转时间|带权周转时间
p1|0|5|5|5|1
p2|2|4|9|7|1.75
p3|3|1|6|3|3
p4|6|2|8|2|1

周转时间平均值：(5 + 7 + 3 + 2) / 4 = 4.25
带权周转时间平均值：(1 + 1.75 + 3 + 1) / 4 = 1.6875

相关问题

使用SPN（最短进程优先）调度算法： 进程|到达时间|执行时间|完成时间|周转时间|带权周转时间 p1|0|5|5|5|1.0 p2|2|4|12|10|2.5 p3|3|1|6|3|3.0 p4|6|2|8|2|1.0对吗，计算下值 周转时间平均值： 带权周转时间平均值：

SPN（最短进程优先）调度算法是一种根据进程的执行时间来进行调度的算法，即选择执行时间最短的进程先执行。根据提供的进程信息，我们可以计算出每个进程的周转时间和带权周转时间。

进程|到达时间|执行时间|完成时间|周转时间|带权周转时间
p1|0|5|5|5|1.0
p2|2|4|12|10|2.5
p3|3|1|6|3|3.0
p4|6|2|8|2|1.0

周转时间平均值：(5 + 10 + 3 + 2) / 4 = 5

带权周转时间平均值：(1.0 + 2.5 + 3.0 + 1.0) / 4 = 1.875

用C语言实现FCFS,SPN和RR算法，每个进程由一个进程控制块(PCB)表示，进程控制块包含进程名、到达时间、完成时间、需要运行时间、已用CPU时间、周转时间、带权周转时间、进程状态

以下是C语言实现FCFS、SPN和RR算法的示例代码：

#include <stdio.h>
#include <stdlib.h>

#define MAX_PROCESSES 10

typedef struct {
    char name[10];
    int arrival_time;
    int burst_time;
    int completion_time;
    int turnaround_time;
    float waiting_time;
    int remaining_time;
} Process;

void FCFS(Process processes[], int n);
void SPN(Process processes[], int n);
void RR(Process processes[], int n, int time_quantum);

int main() {
    Process processes[MAX_PROCESSES];
    int n, i, time_quantum;

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

    for (i = 0; i < n; i++) {
        printf("Enter the process name: ");
        scanf("%s", processes[i].name);
        printf("Enter the arrival time: ");
        scanf("%d", &processes[i].arrival_time);
        printf("Enter the burst time: ");
        scanf("%d", &processes[i].burst_time);
        processes[i].remaining_time = processes[i].burst_time;
    }

    printf("\nChoose a scheduling algorithm:\n");
    printf("1. FCFS\n");
    printf("2. SPN\n");
    printf("3. RR\n");
    printf("Enter your choice: ");
    scanf("%d", &i);

    switch (i) {
        case 1:
            FCFS(processes, n);
            break;
        case 2:
            SPN(processes, n);
            break;
        case 3:
            printf("Enter the time quantum: ");
            scanf("%d", &time_quantum);
            RR(processes, n, time_quantum);
            break;
        default:
            printf("Invalid choice\n");
            break;
    }

    return 0;
}

void FCFS(Process processes[], int n) {
    int i, current_time = 0;

    for (i = 0; i < n; i++) {
        if (current_time < processes[i].arrival_time) {
            current_time = processes[i].arrival_time;
        }
        processes[i].completion_time = current_time + processes[i].burst_time;
        processes[i].turnaround_time = processes[i].completion_time - processes[i].arrival_time;
        processes[i].waiting_time = processes[i].turnaround_time - processes[i].burst_time;
        current_time = processes[i].completion_time;
    }

    printf("\nProcess\tArrival Time\tBurst Time\tCompletion Time\tTurnaround Time\tWaiting Time\n");
    for (i = 0; i < n; i++) {
        printf("%s\t%d\t\t%d\t\t%d\t\t%d\t\t\t%.2f\n", processes[i].name, processes[i].arrival_time,
               processes[i].burst_time, processes[i].completion_time, processes[i].turnaround_time,
               processes[i].waiting_time);
    }
}

void SPN(Process processes[], int n) {
    int i, j, current_time = 0, shortest;
    Process temp;

    for (i = 0; i < n; i++) {
        shortest = i;
        for (j = i; j < n; j++) {
            if (processes[j].arrival_time <= current_time && processes[j].burst_time < processes[shortest].burst_time) {
                shortest = j;
            }
        }

        temp = processes[i];
        processes[i] = processes[shortest];
        processes[shortest] = temp;

        processes[i].completion_time = current_time + processes[i].burst_time;
        processes[i].turnaround_time = processes[i].completion_time - processes[i].arrival_time;
        processes[i].waiting_time = processes[i].turnaround_time - processes[i].burst_time;
        current_time = processes[i].completion_time;
    }

    printf("\nProcess\tArrival Time\tBurst Time\tCompletion Time\tTurnaround Time\tWaiting Time\n");
    for (i = 0; i < n; i++) {
        printf("%s\t%d\t\t%d\t\t%d\t\t%d\t\t\t%.2f\n", processes[i].name, processes[i].arrival_time,
               processes[i].burst_time, processes[i].completion_time, processes[i].turnaround_time,
               processes[i].waiting_time);
    }
}

void RR(Process processes[], int n, int time_quantum) {
    int i, j, current_time = 0, remaining = n, time_passed = 0;
    Process temp;

    while (remaining > 0) {
        for (i = 0; i < n; i++) {
            if (processes[i].arrival_time <= current_time && processes[i].remaining_time > 0) {
                if (processes[i].remaining_time > time_quantum) {
                    processes[i].remaining_time -= time_quantum;
                    time_passed += time_quantum;
                } else {
                    time_passed += processes[i].remaining_time;
                    processes[i].remaining_time = 0;
                    processes[i].completion_time = current_time + time_passed;
                    processes[i].turnaround_time = processes[i].completion_time - processes[i].arrival_time;
                    processes[i].waiting_time = processes[i].turnaround_time - processes[i].burst_time;
                    remaining--;
                }
            }
        }
        current_time += time_passed;
        time_passed = 0;
    }

    printf("\nProcess\tArrival Time\tBurst Time\tCompletion Time\tTurnaround Time\tWaiting Time\n");
    for (i = 0; i < n; i++) {
        printf("%s\t%d\t\t%d\t\t%d\t\t%d\t\t\t%.2f\n", processes[i].name, processes[i].arrival_time,
               processes[i].burst_time, processes[i].completion_time, processes[i].turnaround_time,
               processes[i].waiting_time);
    }
}

其中，FCFS函数实现先来先服务算法，SPN函数实现短作业优先算法，RR函数实现时间片轮转算法。每个进程由一个Process结构体表示，包含进程名、到达时间、需要运行时间、已用CPU时间、完成时间、周转时间、带权周转时间和进程状态。