多道程序系统的作业调度模拟程序代码
时间: 2023-11-18 07:11:05 浏览: 40
以下是一个简单的多道程序系统的作业调度模拟程序代码,供参考:
```python
class Job:
def __init__(self, id, arrival_time, burst_time):
self.id = id
self.arrival_time = arrival_time
self.burst_time = burst_time
self.remaining_time = burst_time
def execute(self):
self.remaining_time -= 1
def is_completed(self):
return self.remaining_time == 0
class Scheduler:
def __init__(self, jobs):
self.jobs = jobs
self.completed_jobs = []
def execute_job(self, job):
job.execute()
if job.is_completed():
self.completed_jobs.append(job)
def run(self):
current_time = 0
while self.jobs:
ready_jobs = [job for job in self.jobs if job.arrival_time <= current_time]
if not ready_jobs:
current_time += 1
continue
executing_job = min(ready_jobs, key=lambda job: job.burst_time)
self.execute_job(executing_job)
self.jobs.remove(executing_job)
current_time += 1
self.completed_jobs.sort(key=lambda job: job.id)
for job in self.completed_jobs:
print(f"Job {job.id} completed in {job.burst_time} units of time.")
# Example usage
jobs = [
Job(1, 0, 10),
Job(2, 1, 5),
Job(3, 2, 3),
Job(4, 3, 8)
]
scheduler = Scheduler(jobs)
scheduler.run()
```
该程序使用了简单的先来先服务算法。每当一个作业到达时,它会被加入就绪队列。调度程序选择就绪队列中执行时间最短的作业进行执行,并在作业执行完毕后将其从队列中移除。程序输出每个作业的完成时间。