所需用到的核心代码

下面是一个简单的银行家算法的示例代码，主要用于检查系统是否安全，以避免出现死锁：

#include <stdio.h>

int main()
{
    int available[10], maximum[10][10], allocation[10][10], need[10][10], safe[10];
    int n, m, i, j, k, count = 0, flag = 0;

    printf("Enter the number of processes: ");
    scanf("%d", &n);

    printf("Enter the number of resources: ");
    scanf("%d", &m);

    printf("Enter the availability of 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("For process %d: ", i + 1);
        for (j = 0; j < m; j++)
        {
            scanf("%d", &maximum[i][j]);
        }
    }

    printf("Enter the allocation for each process: ");
    for (i = 0; i < n; i++)
    {
        printf("For process %d: ", i + 1);
        for (j = 0; j < m; j++)
        {
            scanf("%d", &allocation[i][j]);
        }
    }

    // Calculate the need matrix
    for (i = 0; i < n; i++)
    {
        for (j = 0; j < m; j++)
        {
            need[i][j] = maximum[i][j] - allocation[i][j];
        }
    }

    // Check if the system is in safe state
    while (count < n)
    {
        flag = 0;
        for (i = 0; i < n; i++)
        {
            if (safe[i] == 0)
            {
                for (j = 0; j < m; j++)
                {
                    if (need[i][j] > available[j])
                    {
                        break;
                    }
                }
                if (j == m)
                {
                    for (k = 0; k < m; k++)
                    {
                        available[k] += allocation[i][k];
                    }
                    safe[i] = 1;
                    flag = 1;
                    count++;
                }
            }
        }
        if (flag == 0)
        {
            printf("The system is not in safe state.\n");
            return 0;
        }
    }

    printf("The system is in safe state.\n");
    return 0;
}

这段代码实现了银行家算法的基本功能，包括输入各种资源的数量、进程的最大需求和已分配资源等信息，然后计算出每个进程的需求矩阵，最后检查系统是否处于安全状态。