进程调度时间片轮转算法的代码
时间: 2024-06-02 18:05:11 浏览: 24
进程调度中的时间片轮转算法是一种基于时间片的调度算法,它会为每个进程分配一个时间片,在该时间片内运行,如果时间片结束了但进程还未执行完,则该进程会被挂起,放到队列末尾,等待下一次调度。下面是时间片轮转算法的代码实现:
```
struct Process {
int pid; // 进程ID
int burst_time; // 执行时间
int remaining_time; // 剩余执行时间
};
// 时间片轮转算法
void round_robin(Process processes[], int n, int time_quantum) {
queue<Process> ready_queue;
int current_time = 0;
int total_burst_time = 0;
// 计算总执行时间
for (int i = 0; i < n; i++) {
total_burst_time += processes[i].burst_time;
}
while (total_burst_time > 0) {
// 将到达时间小于等于当前时间的进程加入就绪队列
for (int i = 0; i < n; i++) {
if (processes[i].burst_time > 0 && processes[i].remaining_time == processes[i].burst_time && processes[i].pid != -1 && processes[i].pid != -2 && current_time >= processes[i].arrival_time) {
ready_queue.push(processes[i]);
}
}
if (ready_queue.empty()) {
current_time++;
continue;
}
// 取出队首进程
Process current_process = ready_queue.front();
ready_queue.pop();
// 执行该进程
if (current_process.remaining_time > time_quantum) {
current_process.remaining_time -= time_quantum;
current_time += time_quantum;
total_burst_time -= time_quantum;
ready_queue.push(current_process); // 将该进程放回队列末尾
} else {
current_time += current_process.remaining_time;
total_burst_time -= current_process.remaining_time;
current_process.remaining_time = 0;
printf("Process %d finished at time %d\n", current_process.pid, current_time);
}
}
}
```