写一段银行家算法的代码
时间: 2023-06-03 20:07:58 浏览: 49
以下是使用Python编写的银行家算法代码:
```
# 银行家算法
# 定义初始变量
available = [3, 3, 2] # 可用资源向量
maximum = [
[7, 5, 3],
[3, 2, 2],
[9, 0, 2],
[2, 2, 2],
[4, 3, 3],
] # 最大需求矩阵
allocation = [
[0, 1, 0],
[2, 0, 0],
[3, 0, 2],
[2, 1, 1],
[0, 0, 2],
] # 分配矩阵
# 计算出需要矩阵
need = []
for i in range(len(maximum)):
need.append([])
for j in range(len(maximum[i])):
need[i].append(maximum[i][j] - allocation[i][j])
# 定义安全序列
safe_sequence = []
work = available[:]
finish = [False for i in range(len(maximum))]
# 遍历所有进程
for i in range(len(maximum)):
# 判断该进程是否可以被满足
if not finish[i] and all(x >= 0 for x in need[i]):
for j in range(len(available)):
work[j] += allocation[i][j]
finish[i] = True
safe_sequence.append(i)
# 继续循环
i = -1
# 输出安全序列
if len(safe_sequence) == len(maximum):
print("Safe sequence: ", safe_sequence)
else:
print("Unsafe state")
```
该代码用于实现银行家算法,通过传入可用资源向量、最大需求矩阵和分配矩阵来判断当前状态是否安全,如果安全,则返回安全序列,否则返回“Unsafe state”。