运用c语言编程实现银行家算法的基本过程,请将代码整合成一个完整的代码
时间: 2024-01-22 20:19:17 浏览: 58
操作系统银行家算法c语言实现
以下是一个简单的银行家算法的C语言实现:
```c
#include<stdio.h>
int main()
{
int n, m, i, j, k;
int available[10], max[10][10], allocation[10][10], need[10][10];
int request[10], finish[10], seq[10], count = 0;
printf("Enter the number of processes: ");
scanf("%d", &n);
printf("Enter the number of resources: ");
scanf("%d", &m);
printf("Enter the number of available resources: ");
for(i = 0; i < m; i++)
scanf("%d", &available[i]);
printf("Enter the maximum demand of each process: ");
for(i = 0; i < n; i++)
{
printf("\nProcess %d: ", i);
for(j = 0; j < m; j++)
scanf("%d", &max[i][j]);
}
printf("\nEnter the allocation for each process: ");
for(i = 0; i < n; i++)
{
printf("\nProcess %d: ", i);
for(j = 0; j < m; j++)
scanf("%d", &allocation[i][j]);
}
for(i = 0; i < n; i++)
for(j = 0; j < m; j++)
need[i][j] = max[i][j] - allocation[i][j];
printf("\nEnter the process requesting resources: ");
scanf("%d", &k);
printf("\nEnter the request: ");
for(i = 0; i < m; i++)
scanf("%d", &request[i]);
for(i = 0; i < m; i++)
if(request[i] > need[k][i])
{
printf("\nError: Requested resources exceed the maximum need!\n");
return 0;
}
for(i = 0; i < m; i++)
if(request[i] > available[i])
{
printf("\nError: Requested resources exceed the available resources!\n");
return 0;
}
for(i = 0; i < m; i++)
{
available[i] -= request[i];
allocation[k][i] += request[i];
need[k][i] -= request[i];
}
for(i = 0; i < n; i++)
finish[i] = 0;
for(i = 0; i < n; i++)
{
for(j = 0; j < n; j++)
{
if(finish[j] == 0)
{
int flag = 1;
for(k = 0; k < m; k++)
if(need[j][k] > available[k])
{
flag = 0;
break;
}
if(flag)
{
seq[count++] = j;
finish[j] = 1;
for(k = 0; k < m; k++)
available[k] += allocation[j][k];
}
}
}
}
printf("\nSafe sequence: ");
for(i = 0; i < n; i++)
printf("%d ", seq[i]);
printf("\n");
return 0;
}
```
这个代码中,首先要求用户输入进程数、资源数、可用资源数、各进程最大需求、已分配资源等信息。然后要求用户输入一个特定进程的资源请求。接着,程序检查该请求是否超出了进程的最大需求和可用资源。如果请求合法,程序会更新系统状态并计算出一个安全序列。最后,程序输出安全序列。
请注意,这个实现仅作为基本示例,并不考虑很多实际情况。在实际应用中,需要根据具体情况进行调整和改进。
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