利用程序设计语言编写算法,模拟实现先到先服务算法FCFS、轮转调度算法RR、最短作业优先算法SJF、优先级调度算法PRIOR、最短剩余时间优先算法SRTF源代码
时间: 2024-10-24 20:16:51 浏览: 65
在程序设计中,实现这些调度算法主要是为了管理和优化系统资源的分配。这里我会简述一下如何通过伪代码描述这几种常见的调度算法:
1. 先到先服务 (FCFS, First-Come-First-Served):
```python
class FCFS:
def __init__(self):
self.jobs = []
def enqueue(self, job):
self.jobs.append(job)
def schedule(self):
while self.jobs:
current_job = self.jobs[0]
print(f"Processing {current_job.id}")
current_job.execute()
self.jobs.pop(0)
```
2. 轮转调度 (Round Robin, RR):
```python
class RR:
def __init__(self, quantum):
self.jobs = []
self.current_job = None
self.quantum = quantum
# ...其他方法...
def process(self):
if not self.current_job:
self.current_job = self.jobs[0] if self.jobs else None
elif self.current_job.time_left() <= self.quantum:
self.current_job.execute()
self.jobs.remove(self.current_job)
if self.jobs:
self.current_job = self.jobs[0]
else:
self.current_job = self.jobs[(self.jobs.index(self.current_job) + 1) % len(self.jobs)]
```
3. 最短作业优先 (SJF, Shortest Job First):
```python
class SJF:
def __init__(self):
self.jobs = []
def enqueue(self, job):
self.jobs.append(job)
self.jobs.sort(key=lambda j: j.duration)
def schedule(self):
while self.jobs:
shortest_job = self.jobs.pop(0)
shortest_job.execute()
```
4. 优先级调度 (PRIORITY, PRIOR):
```python
class PRIOR:
def __init__(self):
self.jobs = []
def enqueue(self, job):
self.jobs.append((job.priority, job))
def schedule(self):
self.jobs.sort(reverse=True)
for _, job in self.jobs:
job.execute()
```
5. 最短剩余时间优先 (SRTF, Shortest Remaining Time First):
```python
class SRTF:
def __init__(self):
self.jobs = []
def enqueue(self, job):
self.jobs.append((job.duration, job))
def schedule(self):
while self.jobs:
shortest_time = min(self.jobs, key=lambda x: x[0])
shortest_time[1].execute()
self.jobs.remove(shortest_time)
```
以上都是简化版本,实际编程时需要考虑并发控制、进程状态更新等细节。对于源代码的具体实现,你需要选择合适的编程语言(如Python、Java等),并结合操作系统内核的知识来完成。
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