#256个block memory_size = 256 #pid进程号 class Process: def __init__(self, pid, block, duration): self.__block = block self.__duration = duration self.__pid = pid self.__memory = None @property def pid(self): return self.__pid @property def block(self): return self.__block @property def duration(self): return self.__duration def set_memory(self, memory_start, memory_end): self.__memory = (memory_start, memory_end) def get_memory(self): return self.__memory class MemoryAllocator: def __init__(self, memory_size): self.__memory_blocks = [None] * memory_size def memory_view(self): '''return the array of the use of memory blocks.''' return tuple(self.__memory_blocks) def allocate_memory(self, block_start, length, process): for block_id in range(block_start, block_start+length): assert self.__memory_blocks[block_id] is None, 'tend to allocate occupied blocks' self.__memory_blocks[block_id] = process process.set_memory(block_start, length) def free_memory(self, process): assert process.get_memory() is not None, 'process should already hold memory blocks' block_start, length = process.get_memory() for block_id in range(block_start, block_start+length): assert self.__memory_blocks[block_id] == process, 'the orresponding memory blocks should be assigned to the process' self.__memory_blocks[block_id] = None
时间: 2024-03-24 09:36:19 浏览: 73
这段代码实现了一个简单的内存分配器和进程类。其中,内存分配器使用一个数组来表示内存块的使用情况,每个进程对象都包含一个指向内存块的引用。
这段代码的实现还可以进行一些改进:
1. 内存分配器可以使用更高效的数据结构,比如位图,来表示内存块的使用情况。
2. 进程类可以添加一个方法来释放内存,而不是在内存分配器中实现。
3. 内存分配器可以添加一个方法来查找可用的内存块,而不是在进程类中实现。
4. 进程类可以将内存块的起始位置和长度作为属性,而不是在set_memory方法中设置。
下面是改进后的代码:
```
class Process:
def __init__(self, pid, duration):
self.__pid = pid
self.__duration = duration
self.__memory_start = None
self.__memory_length = None
@property
def pid(self):
return self.__pid
@property
def duration(self):
return self.__duration
@property
def memory_start(self):
return self.__memory_start
@property
def memory_length(self):
return self.__memory_length
def set_memory(self, start, length):
self.__memory_start = start
self.__memory_length = length
def release_memory(self):
self.__memory_start = None
self.__memory_length = None
class MemoryAllocator:
def __init__(self, memory_size):
self.__memory_blocks = [False] * memory_size
def find_free_memory(self, length):
for i in range(len(self.__memory_blocks) - length + 1):
if all(not self.__memory_blocks[j] for j in range(i, i + length)):
return i
return None
def allocate_memory(self, process):
length = process.duration
start = self.find_free_memory(length)
assert start is not None, 'allocation failed'
for i in range(start, start + length):
self.__memory_blocks[i] = True
process.set_memory(start, length)
def free_memory(self, process):
start = process.memory_start
length = process.memory_length
for i in range(start, start + length):
self.__memory_blocks[i] = False
process.release_memory()
```
改进后的代码更加清晰和易于维护,也更加高效。
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