银行家算法1、主要数据结构的变量名和教材中的一致,包括Available、Max、Allocation、Need、Request、Work、Finish。 2、程序可支持不同个数的进程和不同个数的资源;
时间: 2023-12-28 19:16:08 浏览: 33
3、程序能够检测到死锁状态并给出相应的提示;
4、程序能够接受用户输入请求资源的进程号和请求资源的数量,并根据银行家算法进行资源分配;
5、程序能够在资源分配过程中判断当前状态是否安全,如果不安全则不进行分配,并给出相应的提示;
6、程序能够模拟进程占用资源和释放资源的情况,并及时更新系统的状态;
7、程序能够显示当前系统的状态,包括每个进程的Allocation、Max、Need和Available等信息;
8、程序能够正确地实现银行家算法,保证资源的安全分配。
相关问题
用java写一段代码,运用银行家算法和安全性检查,数据采用随机
好的,以下是使用Java实现银行家算法和安全性检查的代码,数据采用随机生成。
```java
import java.util.*;
public class BankerAlgorithm {
private int[][] allocation; // 分配矩阵
private int[][] max; // 最大需求矩阵
private int[][] need; // 需求矩阵
private int[] available; // 可用资源向量
private int[] safeSequence; // 安全序列
public BankerAlgorithm(int[][] allocation, int[][] max, int[] available) {
this.allocation = allocation;
this.max = max;
this.available = available;
this.need = new int[allocation.length][available.length];
this.safeSequence = new int[allocation.length];
// 计算需求矩阵
for (int i = 0; i < allocation.length; i++) {
for (int j = 0; j < available.length; j++) {
need[i][j] = max[i][j] - allocation[i][j];
}
}
}
// 判断当前状态是否安全
private boolean isSafeState() {
boolean[] finish = new boolean[allocation.length];
int[] work = Arrays.copyOf(available, available.length);
int count = 0;
while (count < allocation.length) {
boolean found = false;
for (int i = 0; i < allocation.length; i++) {
if (!finish[i] && Arrays.compare(need[i], work) <= 0) {
finish[i] = true;
work = addVector(work, allocation[i]);
safeSequence[count++] = i;
found = true;
}
}
if (!found) {
return false;
}
}
return true;
}
// 银行家算法
public boolean requestResources(int process, int[] request) {
if (Arrays.compare(request, need[process]) > 0) {
return false;
}
if (Arrays.compare(request, available) > 0) {
return false;
}
int[][] newAllocation = Arrays.copyOf(allocation, allocation.length);
int[][] newNeed = Arrays.copyOf(need, need.length);
int[] newAvailable = Arrays.copyOf(available, available.length);
newAllocation[process] = addVector(newAllocation[process], request);
newNeed[process] = subtractVector(newNeed[process], request);
newAvailable = subtractVector(newAvailable, request);
BankerAlgorithm banker = new BankerAlgorithm(newAllocation, max, newAvailable);
return banker.isSafeState();
}
// 向量相加
private int[] addVector(int[] a, int[] b) {
int[] c = new int[a.length];
for (int i = 0; i < a.length; i++) {
c[i] = a[i] + b[i];
}
return c;
}
// 向量相减
private int[] subtractVector(int[] a, int[] b) {
int[] c = new int[a.length];
for (int i = 0; i < a.length; i++) {
c[i] = a[i] - b[i];
}
return c;
}
public static void main(String[] args) {
// 随机生成数据
Random random = new Random();
int n = 5; // 进程数
int m = 3; // 资源数
int[][] allocation = new int[n][m];
int[][] max = new int[n][m];
int[] available = new int[m];
for (int i = 0; i < n; i++) {
for (int j = 0; j < m; j++) {
allocation[i][j] = random.nextInt(10);
max[i][j] = allocation[i][j] + random.nextInt(10);
}
}
for (int j = 0; j < m; j++) {
available[j] = random.nextInt(10);
}
BankerAlgorithm banker = new BankerAlgorithm(allocation, max, available);
// 打印初始状态
System.out.println("初始状态:");
System.out.println("Allocation:");
printMatrix(allocation);
System.out.println("Max:");
printMatrix(max);
System.out.println("Need:");
printMatrix(banker.need);
System.out.println("Available:");
System.out.println(Arrays.toString(available));
// 安全性检查
if (banker.isSafeState()) {
System.out.println("当前状态是安全的,安全序列为: " + Arrays.toString(banker.safeSequence));
} else {
System.out.println("当前状态是不安全的");
}
// 请求资源
int process = random.nextInt(n);
int[] request = new int[m];
for (int j = 0; j < m; j++) {
request[j] = random.nextInt(banker.need[process][j] + 1);
}
System.out.println("进程 " + process + " 请求资源: " + Arrays.toString(request));
if (banker.requestResources(process, request)) {
System.out.println("请求资源成功,当前状态是安全的,安全序列为: " + Arrays.toString(banker.safeSequence));
} else {
System.out.println("请求资源失败,当前状态是不安全的");
}
}
// 打印矩阵
private static void printMatrix(int[][] matrix) {
for (int i = 0; i < matrix.length; i++) {
System.out.print(Arrays.toString(matrix[i]));
if (i != matrix.length - 1) {
System.out.println();
}
}
System.out.println();
}
}
```
python银行家算法实现资源分配和进程调度
很抱歉,Python并不是操作系统,也不是用于操作系统开发的编程语言,因此Python本身并没有实现银行家算法。但是,我们可以使用Python编写模拟银行家算法的程序来进行资源分配和进程调度的模拟。
以下是一个简单的Python程序,用于模拟银行家算法的资源分配和进程调度:
```python
定义银行家算法的数据结构
class Banker:
def __init__(self, available, max_need, allocation):
self.available = available # 可用资源
self.max_need = max_need # 进程最大需求量
self.allocation = allocation # 进程已分配资源量
self.need = max_need - allocation # 进程尚需资源量
# 检查是否存在安全序列
def is_safe(self):
work = self.available.copy()
finish = [False] * len(self.max_need)
safe_sequence = []
while True:
found = False
for i in range(len(self.max_need)):
if not finish[i] and all(need <= work for need, work in zip(self.need[i], work)):
work = [work[j] + self.allocation[i][j] for j in range(len(work))]
finish[i] = True
safe_sequence.append(i)
found = True
if not found:
break
return all(finish), safe_sequence
# 分配资源
def allocate(self, process_id, request):
if all(request <= self.need[process_id]) and all(request <= self.available):
self.available -= request
self.allocation[process_id] += request
self.need[process_id] -= request
return True
else:
return False
# 释放资源
def release(self, process_id, release):
self.available += release
self.allocation[process_id] -= release
self.need[process_id] += release
# 测试程序
if __name__ == '__main__':
# 初始化银行家算法的数据结构
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]]
banker = Banker(available, max_need, allocation)
# 模拟进程请求资源
process_id = 0
request = [0, 2, 0]
if banker.allocate(process_id, request):
print('分配成功')
if banker.is_safe()[0]:
print('存在安全序列')
else:
print('不存在安全序列,分配失败')
banker.release(process_id, request)
else:
print('分配失败')
```
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