用代码编写银行家算法的数据结构

以下是银行家算法的数据结构示例代码：

# 定义进程类
class Process:
    def __init__(self, pid, max_claim, allocated):
        self.pid = pid  # 进程ID
        self.max_claim = max_claim  # 最大需求量
        self.allocated = allocated  # 已分配资源量
        self.need = [max_claim[i] - allocated[i] for i in range(len(max_claim))]  # 还需要的资源量

# 定义银行家算法类
class Banker:
    def __init__(self, available, processes):
        self.available = available  # 可用资源量
        self.processes = processes  # 进程列表

    # 判断是否存在安全序列
    def is_safe(self):
        work = self.available.copy()  # 可用资源量的副本
        finish = [False] * len(self.processes)  # 进程是否完成的标志位
        safe_sequence = []  # 安全序列

        while False in finish:
            found = False
            for i in range(len(self.processes)):
                if not finish[i] and all([self.processes[i].need[j] <= work[j] for j in range(len(work))]):
                    work = [work[j] + self.processes[i].allocated[j] for j in range(len(work))]
                    finish[i] = True
                    safe_sequence.append(self.processes[i].pid)
                    found = True
                    break
            if not found:
                return False, []
        return True, safe_sequence

    # 分配资源
    def allocate(self, pid, request):
        process = self.processes[pid]
        if all([request[i] <= process.need[i] for i in range(len(request))]) and all([request[i] <= self.available[i] for i in range(len(request))]):
            self.available = [self.available[i] - request[i] for i in range(len(request))]
            process.allocated = [process.allocated[i] + request[i] for i in range(len(request))]
            process.need = [process.need[i] - request[i] for i in range(len(request))]
            return True
        else:
            return False