给我一个优先级调度算法,要求用C语言实现,每进行一次调度程序都打印一次运行进程、就绪队列、以及各个进程的 PCB,以便 进行检查。重复以上过程,直到所有进程都完成为止。
时间: 2024-05-11 16:16:05 浏览: 5
好的,我了解您的要求。以下是一个基于优先级调度的算法的 C 语言实现代码。每轮调度完成后,都会打印出当前的运行进程、就绪队列和各个进程的 PCB 表格,直到所有进程都完成。
```
#include <stdio.h>
#include <stdlib.h>
#define MAX_PROCESSES 10
#define MAX_PRIORITY 5
/* 进程控制块 */
typedef struct PCB {
int id; /* 进程 id */
int priority; /* 优先级 */
int burst_time; /* 执行时间 */
int remaining_time; /* 剩余时间 */
int state; /* 进程状态:1(就绪)、2(运行)、3(完成) */
} PCB;
PCB ready_queue[MAX_PRIORITY][MAX_PROCESSES];
PCB running_process;
int num_processes;
/* 初始化就绪队列 */
void init_ready_queue() {
int i, j;
for (i = 0; i < MAX_PRIORITY; i++) {
for (j = 0; j < MAX_PROCESSES; j++) {
ready_queue[i][j].id = -1;
ready_queue[i][j].priority = -1;
ready_queue[i][j].burst_time = -1;
ready_queue[i][j].remaining_time = -1;
ready_queue[i][j].state = 0;
}
}
}
/* 创建进程 */
void create_process(int id, int priority, int burst_time) {
PCB new_process;
new_process.id = id;
new_process.priority = priority;
new_process.burst_time = burst_time;
new_process.remaining_time = burst_time;
new_process.state = 1;
ready_queue[priority-1][num_processes] = new_process;
num_processes++;
}
/* 选择下一个要运行的进程 */
PCB select_process() {
int i, j;
for (i = 0; i < MAX_PRIORITY; i++) {
for (j = 0; j < MAX_PROCESSES; j++) {
if (ready_queue[i][j].state == 1) {
return ready_queue[i][j];
}
}
}
PCB empty_process;
empty_process.id = -1;
return empty_process;
}
/* 执行当前进程 */
void execute_process() {
running_process.remaining_time--;
}
/* 更新进程状态 */
void update_process_state() {
int i, j;
for (i = 0; i < MAX_PRIORITY; i++) {
for (j = 0; j < MAX_PROCESSES; j++) {
if (ready_queue[i][j].state == 1 && ready_queue[i][j].remaining_time == 0) {
ready_queue[i][j].state = 3;
}
}
}
if (running_process.remaining_time == 0) {
running_process.state = 3;
}
}
/* 打印就绪队列和每个进程的 PCB */
void print_status() {
int i, j;
printf("\n============ Ready Queue ============\n");
printf("Priority\tProcess ID\tBurst Time\n");
for (i = 0; i < MAX_PRIORITY; i++) {
printf("%d\t\t", i+1);
for (j = 0; j < MAX_PROCESSES; j++) {
if (ready_queue[i][j].state != 0) {
printf("%d\t\t%d\t\t%d\n", ready_queue[i][j].id, ready_queue[i][j].burst_time);
}
}
}
printf("\n============ PCB Table =============\n");
printf("Process ID\tPriority\tBurst Time\tRemaining Time\tState\n");
for (i = 0; i < MAX_PRIORITY; i++) {
for (j = 0; j < MAX_PROCESSES; j++) {
if (ready_queue[i][j].state != 0) {
printf("%d\t\t%d\t\t%d\t\t%d\t\t%d\n", ready_queue[i][j].id, ready_queue[i][j].priority, ready_queue[i][j].burst_time, ready_queue[i][j].remaining_time, ready_queue[i][j].state);
}
}
}
}
/* 主函数 */
int main() {
int i;
init_ready_queue();
num_processes = 0;
/* 创建进程 */
create_process(1, 3, 5);
create_process(2, 2, 10);
create_process(3, 1, 3);
create_process(4, 3, 8);
create_process(5, 4, 6);
/* 进行调度 */
while (num_processes > 0) {
print_status();
/* 选择下一个要运行的进程 */
PCB new_process = select_process();
/* 更新当前运行进程的状态 */
update_process_state();
/* 如果有新的进程可以运行 */
if (new_process.id != -1) {
running_process = new_process;
running_process.state = 2;
}
execute_process();
}
printf("\n所有进程都已完成!\n");
return 0;
}
```
希望这份代码能够帮到您!