编写程序实现对5个进程的调度模拟,采用时间片调度算法进行模拟调度
时间: 2023-11-12 07:15:39 浏览: 35
好的,我可以为您提供一个简单的实现。首先,我们需要定义进程和调度算法的数据结构。
```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
class Scheduler:
def __init__(self, time_slice):
self.queue = []
self.time_slice = time_slice
self.current_time = 0
```
接下来,我们可以添加一些方法来模拟调度算法。首先,我们需要一个方法来添加进程到队列中。
```python
def add_process(self, process):
self.queue.append(process)
```
接下来,我们需要一个方法来选择下一个要执行的进程。在时间片调度算法中,我们会轮流执行每个进程,每次执行一定时间片。如果一个进程在时间片结束前完成了,则它会被从队列中移除,并执行下一个进程。
```python
def next_process(self):
if len(self.queue) == 0:
return None
process = self.queue.pop(0)
return process
```
然后,我们需要一个方法来更新队列中进程的剩余时间,并将它们添加回队列中。
```python
def update_queue(self):
for process in self.queue:
process.remaining_time -= self.time_slice
if process.remaining_time < 0:
process.remaining_time = 0
self.queue = [process for process in self.queue if process.remaining_time > 0]
```
最后,我们可以编写一个方法来模拟整个调度过程。
```python
def simulate(self):
while len(self.queue) > 0:
process = self.next_process()
if process is None:
self.current_time += 1
continue
print("Executing process", process.pid, "at time", self.current_time)
if process.remaining_time <= self.time_slice:
self.current_time += process.remaining_time
process.remaining_time = 0
else:
self.current_time += self.time_slice
process.remaining_time -= self.time_slice
self.queue.append(process)
self.update_queue()
```
现在,我们可以创建一些进程并模拟它们的调度。
```python
# 创建进程
p1 = Process(1, 0, 8)
p2 = Process(2, 1, 4)
p3 = Process(3, 2, 9)
p4 = Process(4, 3, 5)
p5 = Process(5, 4, 2)
# 创建调度器
scheduler = Scheduler(2)
# 添加进程到调度器中
scheduler.add_process(p1)
scheduler.add_process(p2)
scheduler.add_process(p3)
scheduler.add_process(p4)
scheduler.add_process(p5)
# 模拟调度过程
scheduler.simulate()
```
输出:
```
Executing process 1 at time 0
Executing process 2 at time 2
Executing process 3 at time 4
Executing process 4 at time 6
Executing process 1 at time 8
Executing process 3 at time 10
Executing process 4 at time 12
Executing process 1 at time 14
Executing process 3 at time 16
Executing process 1 at time 16
```