使用编程语言实现防止死锁的银行家算法
时间: 2023-12-18 20:28:39 浏览: 49
银行家算法是一种避免死锁的算法,它通过动态地分配资源来避免死锁的发生。以下是使用Python实现银行家算法的示例代码:
```python
# 定义银行家算法类
class BankerAlgorithm:
def __init__(self, available, max_need, allocation):
self.available = available # 可用资源向量
self.max_need = max_need # 最大需求矩阵
self.allocation = allocation # 已分配矩阵
self.need = max_need - allocation # 需求矩阵
self.safe_sequence = [] # 安全序列
# 判断是否存在安全序列
def is_safe(self):
work = self.available.copy()
finish = [False] * len(self.max_need)
while False in finish:
flag = False
for i in range(len(self.max_need)):
if not finish[i] and all(self.need[i] <= work):
work += self.allocation[i]
finish[i] = True
self.safe_sequence.append(i)
flag = True
if not flag:
return False
return True
# 分配资源
def allocate(self, process, request):
if all(request <= self.need[process]) and all(request <= self.available):
self.available -= request
self.allocation[process] += request
self.need[process] -= request
if self.is_safe():
return True
else:
self.available += request
self.allocation[process] -= request
self.need[process] += request
return False
else:
return False
```
使用示例:
```python
# 测试数据
available = [3, 3, 2]
max_need = [[7, 5, 3], [3, 2, 2], [9, 0, 2], [2, 2, 2], [4, 3, 3]]
allocation = [[0, 1, 0], [2, 0, 0], [3, 0, 2], [2, 1, 1], [0, 0, 2]]
# 创建银行家算法对象
ba = BankerAlgorithm(available, max_need, allocation)
# 判断是否存在安全序列
if ba.is_safe():
print("存在安全序列:", ba.safe_sequence)
else:
print("不存在安全序列")
# 分配资源
if ba.allocate(1, [1, 0, 2]):
print("分配成功")
else:
print("分配失败")
```
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