处理机调度的时间片轮转python
时间: 2023-11-17 16:04:27 浏览: 89
以下是一个简单的时间片轮转调度算法的Python实现:
```python
class Process:
def __init__(self, pid, arrival_time, burst_time):
self.pid = pid
self.arrival_time = arrival_time
self.burst_time = burst_time
self.remaining_time = burst_time
def execute(self, time_slice):
if self.remaining_time > time_slice:
self.remaining_time -= time_slice
return time_slice
else:
time_executed = self.remaining_time
self.remaining_time = 0
return time_executed
def is_completed(self):
return self.remaining_time == 0
def round_robin(processes, time_slice):
current_time = 0
completed_processes = []
ready_queue = []
while True:
for process in processes:
if process.arrival_time <= current_time and process not in completed_processes:
ready_queue.append(process)
if not ready_queue:
break
current_process = ready_queue.pop(0)
time_executed = current_process.execute(time_slice)
current_time += time_executed
if current_process.is_completed():
completed_processes.append(current_process)
return completed_processes
```
这个实现中,我们定义了一个Process类来表示进程,包括进程ID、到达时间、执行时间和剩余时间。我们还定义了一个round_robin函数来实现时间片轮转调度算法。该函数接受两个参数:进程列表和时间片大小。在函数内部,我们首先将所有到达时间小于等于当前时间的进程添加到就绪队列中。然后,我们从就绪队列中选择一个进程来执行,执行一个时间片的时间,并将当前时间增加相应的时间。如果进程执行完毕,我们将其添加到已完成进程列表中。最后,我们返回已完成进程列表。
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