C程序模拟实现单处理机系统中的进程调度算法,实现对多个进程的调度模拟,要求采用动态优先级调度算法进行模拟调度。】
时间: 2023-09-24 14:11:17 浏览: 94
模拟单处理机进程调度算法
好的,以下是一个简单的C程序,用于模拟动态优先级调度算法:
```c
#include <stdio.h>
// 进程结构体
struct process {
int pid;
int priority;
int arrival_time;
int burst_time;
int remaining_time;
int waiting_time;
int turnaround_time;
};
// 动态优先级调度算法
void dynamic_priority_scheduling(struct process processes[], int n) {
int current_time = 0;
int completed = 0;
while (completed < n) {
int next_process = -1;
int highest_priority = -1;
// 找出当前时间到达的所有进程中优先级最高的进程
for (int i = 0; i < n; i++) {
if (processes[i].arrival_time <= current_time && processes[i].remaining_time > 0) {
if (processes[i].priority > highest_priority) {
highest_priority = processes[i].priority;
next_process = i;
}
}
}
if (next_process == -1) {
// 当前时间没有到达的进程,时间加一
current_time++;
} else {
// 执行选中的进程
processes[next_process].remaining_time--;
current_time++;
if (processes[next_process].remaining_time == 0) {
// 进程执行完毕
processes[next_process].turnaround_time = current_time - processes[next_process].arrival_time;
processes[next_process].waiting_time = processes[next_process].turnaround_time - processes[next_process].burst_time;
completed++;
}
}
// 动态调整进程的优先级
for (int i = 0; i < n; i++) {
if (processes[i].arrival_time <= current_time && processes[i].remaining_time > 0) {
if (i != next_process) {
processes[i].priority--;
}
}
}
}
// 计算平均等待时间和平均周转时间
int total_waiting_time = 0;
int total_turnaround_time = 0;
for (int i = 0; i < n; i++) {
total_waiting_time += processes[i].waiting_time;
total_turnaround_time += processes[i].turnaround_time;
}
float avg_waiting_time = (float) total_waiting_time / n;
float avg_turnaround_time = (float) total_turnaround_time / n;
// 输出结果
printf("平均等待时间:%f\n", avg_waiting_time);
printf("平均周转时间:%f\n", avg_turnaround_time);
}
int main() {
// 测试数据
struct process processes[] = {
{1, 3, 0, 5, 5, 0, 0},
{2, 2, 1, 3, 3, 0, 0},
{3, 1, 2, 6, 6, 0, 0},
{4, 4, 3, 1, 1, 0, 0},
{5, 5, 4, 2, 2, 0, 0}
};
int n = sizeof(processes) / sizeof(struct process);
// 调用动态优先级调度算法
dynamic_priority_scheduling(processes, n);
return 0;
}
```
上面的程序定义了一个进程结构体,包含进程的PID、优先级、到达时间、执行时间等信息。在 `dynamic_priority_scheduling` 函数中,实现了动态优先级调度算法的具体逻辑。在 `main` 函数中,定义了一个包含5个进程的数组,然后调用了 `dynamic_priority_scheduling` 函数进行模拟调度。
需要注意的是,上面的程序只是一个简单的示例,实际的应用场景可能更加复杂,需要根据实际情况进行修改和优化。
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