用c语言写一段代码,要求:模拟实现cpu任务调度. 要求说明调度算法及实现的数据结构
时间: 2024-02-13 09:05:37 浏览: 74
好的,下面是用C语言实现CPU任务调度的示例代码,实现了先来先服务(FCFS)算法:
```
#include <stdio.h>
#include <stdlib.h>
#define MAX_PROCESSES 5
typedef struct {
int pid;
int arrival_time;
int burst_time;
int waiting_time;
int turnaround_time;
} process_t;
void fcfs_schedule(process_t *processes, int n) {
int i, j;
int current_time = 0;
float average_waiting_time = 0, average_turnaround_time = 0;
// 计算每个进程的等待时间和周转时间
for (i = 0; i < n; i++) {
if (current_time < processes[i].arrival_time) {
current_time = processes[i].arrival_time;
}
processes[i].waiting_time = current_time - processes[i].arrival_time;
processes[i].turnaround_time = processes[i].waiting_time + processes[i].burst_time;
current_time += processes[i].burst_time;
average_waiting_time += processes[i].waiting_time;
average_turnaround_time += processes[i].turnaround_time;
}
// 打印进程信息
printf("PID\tArrival Time\tBurst Time\tWaiting Time\tTurnaround Time\n");
for (i = 0; i < n; i++) {
printf("%d\t%d\t\t%d\t\t%d\t\t%d\n", processes[i].pid, processes[i].arrival_time,
processes[i].burst_time, processes[i].waiting_time, processes[i].turnaround_time);
}
// 打印平均等待时间和平均周转时间
average_waiting_time /= n;
average_turnaround_time /= n;
printf("Average Waiting Time: %.2f\n", average_waiting_time);
printf("Average Turnaround Time: %.2f\n", average_turnaround_time);
}
int main() {
int i;
process_t processes[MAX_PROCESSES] = {
{1, 0, 3, 0, 0},
{2, 1, 5, 0, 0},
{3, 2, 2, 0, 0},
{4, 3, 4, 0, 0},
{5, 4, 1, 0, 0}
};
fcfs_schedule(processes, MAX_PROCESSES);
return 0;
}
```
以上代码实现了先来先服务(FCFS)算法,采用了结构体来存储进程的相关信息,包括进程ID、到达时间、执行时间、等待时间和周转时间。
在 `fcfs_schedule` 函数中,首先通过循环计算每个进程的等待时间和周转时间,并累加计算平均等待时间和平均周转时间。然后打印出每个进程的信息,并输出平均等待时间和平均周转时间。
在 `main` 函数中,定义了一个包含5个进程的进程数组,并调用 `fcfs_schedule` 函数进行调度。
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