编写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,要求采用时间片轮转算法,进行模拟调度。
时间: 2023-11-12 18:27:26 浏览: 91
好的,我会根据您的要求编写一个C程序模拟实现单处理机系统中的进程调度算法,采用时间片轮转算法进行模拟调度。
以下是代码:
```
#include <stdio.h>
#include <stdlib.h>
#define MAX_PROCESS 10
#define TIME_QUANTUM 2
typedef struct Process {
int pid;
int arrival_time;
int burst_time;
int remaining_time; // 剩余需要运行的时间
int waiting_time; // 等待时间
int turnaround_time; // 周转时间
int completed; // 是否完成
} Process;
void printGanttChart(Process processes[], int n) {
int i, j;
int total_time = 0;
int time = 0;
int burst_time[MAX_PROCESS] = { 0 };
int completion_time[MAX_PROCESS] = { 0 };
// 初始化剩余时间和等待时间
for (i = 0; i < n; i++) {
processes[i].remaining_time = processes[i].burst_time;
processes[i].waiting_time = 0;
processes[i].turnaround_time = 0;
processes[i].completed = 0;
total_time += processes[i].burst_time;
}
printf("\n");
while (time < total_time) {
// 执行进程
for (i = 0; i < n; i++) {
if (processes[i].arrival_time <= time && processes[i].remaining_time > 0) {
printf("| P%d ", processes[i].pid);
burst_time[i]++;
time++;
processes[i].remaining_time--;
if (processes[i].remaining_time == 0) {
processes[i].completed = 1;
completion_time[i] = time;
}
if (time % TIME_QUANTUM == 0 || processes[i].remaining_time == 0) {
break;
}
}
}
// 更新等待时间
for (i = 0; i < n; i++) {
if (processes[i].arrival_time <= time && processes[i].remaining_time > 0 && processes[i].completed == 0 && i != j) {
processes[i].waiting_time++;
}
}
}
printf("|\n");
// 计算等待时间和周转时间
int total_waiting_time = 0;
int total_turnaround_time = 0;
for (i = 0; i < n; i++) {
processes[i].turnaround_time = completion_time[i] - processes[i].arrival_time;
processes[i].waiting_time = processes[i].turnaround_time - processes[i].burst_time;
total_waiting_time += processes[i].waiting_time;
total_turnaround_time += processes[i].turnaround_time;
}
// 输出结果
printf("\nProcess\tArrival Time\tBurst Time\tWaiting Time\tTurnaround Time\n");
for (i = 0; i < n; i++) {
printf("P%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);
}
printf("\nAverage waiting time: %f\n", (float)total_waiting_time / n);
printf("Average turnaround time: %f\n", (float)total_turnaround_time / n);
}
int main() {
int n, i;
Process processes[MAX_PROCESS];
// 输入进程信息
printf("Enter the number of processes: ");
scanf("%d", &n);
printf("Enter the arrival time and burst time of each process:\n");
for (i = 0; i < n; i++) {
printf("P%d: ", i + 1);
processes[i].pid = i + 1;
scanf("%d %d", &processes[i].arrival_time, &processes[i].burst_time);
}
// 执行进程调度算法
printGanttChart(processes, n);
return 0;
}
```
该程序使用了一个结构体来表示进程,并实现了时间片轮转算法进行进程调度。程序会首先输入每个进程的到达时间和执行时间,然后输出进程的调度图和等待时间、周转时间等统计信息。
希望这个程序能够满足您的需求。
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