📅  最后修改于: 2023-12-03 15:40:57.748000             🧑  作者: Mango
展位算法是一种为了优化电脑内存管理的算法。它的主要思想是在内存中存储进程时,将可用的内存空间按大小进行分割,同时为每个分割的内存空间分配一个表项,以便在需要时快速找到相应的内存块。
展位算法的实现包括以下几个步骤:
以下是展位算法的Python代码实现:
class MemoryBlock:
def __init__(self, size, start_addr):
self.size = size
self.start_addr = start_addr
self.free = True
self.process_id = None
class MemoryManager:
def __init__(self, memory_size):
self.memory_size = memory_size
self.memory = [MemoryBlock(memory_size, 0)]
self.processes = {}
def add_process(self, process_id, process_size):
for block in self.memory:
if block.size >= process_size and block.free:
block.free = False
block.process_id = process_id
if block.size > process_size:
new_block = MemoryBlock(block.size - process_size, block.start_addr + process_size)
self.memory.insert(self.memory.index(block) + 1, new_block)
block.size = process_size
self.processes[process_id] = block.start_addr
return block.start_addr
return None
def remove_process(self, process_id):
if process_id in self.processes:
start_addr = self.processes[process_id]
for i in range(len(self.memory)):
if self.memory[i].start_addr == start_addr:
self.memory[i].free = True
self.memory[i].process_id = None
if i > 0 and self.memory[i-1].free:
self.memory[i-1].size += self.memory[i].size
self.memory.pop(i)
if i < len(self.memory)-1 and self.memory[i+1].free:
self.memory[i].size += self.memory[i+1].size
self.memory.pop(i+1)
return True
return False
实现了电脑组织展位算法的Python代码,已经上方提供。各位程序员可以参考上面的代码,结合自己的实际开发需求,来改写实现这个算法。