银行家算法和安全性算法python

银行家算法是一种资源分配算法，用于避免死锁。它通过检查系统中可用资源的数量来确定是否可以满足进程的请求，从而避免死锁的发生。安全性算法是一种用于检查系统是否处于安全状态的算法，它可以检查系统中是否存在死锁，并确定是否可以分配资源以避免死锁。

以下是一个使用Python实现银行家算法和安全性算法的示例代码：

# 银行家算法
def banker_algorithm(available, max_need, allocation):
    n = len(available)
    work = available.copy()
    finish = [False] * n
    need = [[max_need[i][j] - allocation[i][j] for j in range(n)] for i in range(n)]
    safe_sequence = []
    while False in finish:
        found = False
        for i in range(n):
            if not finish[i] and all(need[i][j] <= work[j] for j in range(n)):
                work = [work[j] + allocation[i][j] for j in range(n)]
                finish[i] = True
                safe_sequence.append(i)
                found = True
        if not found:
            return None
    return safe_sequence

# 安全性算法
def safety_algorithm(available, max_need, allocation):
    n = len(available)
    work = available.copy()
    finish = [False] * n
    need = [[max_need[i][j] - allocation[i][j] for j in range(n)] for i in range(n)]
    while False in finish:
        found = False
        for i in range(n):
            if not finish[i] and all(need[i][j] <= work[j] for j in range(n)):
                work = [work[j] + allocation[i][j] for j in range(n)]
                finish[i] = True
                found = True
        if not found:
            return False
    return True