c语言银行家算法代码
时间: 2023-07-03 18:19:26 浏览: 71
下面是一个简单的C语言银行家算法代码示例:
```c
#include <stdio.h>
int main() {
int i, j, process_count, resource_count;
printf("Enter number of processes: ");
scanf("%d", &process_count);
printf("Enter number of resources: ");
scanf("%d", &resource_count);
// 需求矩阵
int max[process_count][resource_count];
// 分配矩阵
int allocation[process_count][resource_count];
// 可用资源向量
int available[resource_count];
printf("Enter maximum resources needed by each process:\n");
for (i = 0; i < process_count; i++) {
printf("Process %d: ", i + 1);
for (j = 0; j < resource_count; j++) {
scanf("%d", &max[i][j]);
}
}
printf("Enter resources allocated to each process:\n");
for (i = 0; i < process_count; i++) {
printf("Process %d: ", i + 1);
for (j = 0; j < resource_count; j++) {
scanf("%d", &allocation[i][j]);
}
}
printf("Enter available resources:\n");
for (i = 0; i < resource_count; i++) {
printf("Resource %d: ", i + 1);
scanf("%d", &available[i]);
}
// 计算需求矩阵
int need[process_count][resource_count];
for (i = 0; i < process_count; i++) {
for (j = 0; j < resource_count; j++) {
need[i][j] = max[i][j] - allocation[i][j];
}
}
// 初始化 finish 向量为 false
int finish[process_count];
for (i = 0; i < process_count; i++) {
finish[i] = 0;
}
// 计算 work 向量
int work[resource_count];
for (i = 0; i < resource_count; i++) {
work[i] = available[i];
}
// 执行银行家算法
int safe_sequence[process_count];
int safe_count = 0;
while (safe_count < process_count) {
int found = 0;
for (i = 0; i < process_count; i++) {
if (!finish[i]) {
int can_execute = 1;
for (j = 0; j < resource_count; j++) {
if (need[i][j] > work[j]) {
can_execute = 0;
break;
}
}
if (can_execute) {
found = 1;
safe_sequence[safe_count] = i + 1;
safe_count++;
finish[i] = 1;
for (j = 0; j < resource_count; j++) {
work[j] += allocation[i][j];
}
}
}
}
if (!found) {
printf("Unsafe state! System cannot allocate resources.\n");
return 0;
}
}
printf("Safe sequence: ");
for (i = 0; i < process_count; i++) {
printf("%d ", safe_sequence[i]);
}
printf("\n");
return 0;
}
```
这个代码实现了银行家算法,通过输入最大需求矩阵、分配矩阵和可用资源向量,计算出需求矩阵,然后检查系统是否处于安全状态,并输出安全序列。如果系统不处于安全状态,则输出错误信息。