用C语言绘制资源分配图
时间: 2023-10-13 13:04:15 浏览: 57
资源分配图是一个用于描述进程和资源之间关系的图形表示方法。下面是一个简单的资源分配图的C语言代码实现:
```c
#include <stdio.h>
#define MAX_PROCESS 10
#define MAX_RESOURCE 10
int allocate[MAX_PROCESS][MAX_RESOURCE];
int max_need[MAX_PROCESS][MAX_RESOURCE];
int available[MAX_RESOURCE];
int main() {
int num_process, num_resource, i, j;
printf("Enter number of processes: ");
scanf("%d", &num_process);
printf("Enter number of resources: ");
scanf("%d", &num_resource);
// 输入每个进程已分配的资源数
printf("Enter allocated resources for each process:\n");
for(i = 0; i < num_process; i++) {
printf("Process %d: ", i+1);
for(j = 0; j < num_resource; j++) {
scanf("%d", &allocate[i][j]);
}
}
// 输入每个进程需要的最大资源数
printf("Enter maximum needed resources for each process:\n");
for(i = 0; i < num_process; i++) {
printf("Process %d: ", i+1);
for(j = 0; j < num_resource; j++) {
scanf("%d", &max_need[i][j]);
}
}
// 输入可用资源数
printf("Enter available resources:\n");
for(i = 0; i < num_resource; i++) {
scanf("%d", &available[i]);
}
// 计算每个进程还需要的资源数
int need[MAX_PROCESS][MAX_RESOURCE];
for(i = 0; i < num_process; i++) {
for(j = 0; j < num_resource; j++) {
need[i][j] = max_need[i][j] - allocate[i][j];
}
}
// 输出资源分配图
printf("\nResource Allocation Graph:\n");
for(i = 0; i < num_process; i++) {
printf("Process %d: ", i+1);
for(j = 0; j < num_resource; j++) {
if(allocate[i][j] > 0) {
printf("%d ", j+1);
}
}
printf("\n");
}
// 模拟资源分配
int work[MAX_RESOURCE];
int finish[MAX_PROCESS];
for(i = 0; i < num_resource; i++) {
work[i] = available[i];
}
for(i = 0; i < num_process; i++) {
finish[i] = 0;
}
int count = 0;
while(count < num_process) {
int found = 0;
for(i = 0; i < num_process; i++) {
if(finish[i] == 0) {
int can_allocate = 1;
for(j = 0; j < num_resource; j++) {
if(need[i][j] > work[j]) {
can_allocate = 0;
break;
}
}
if(can_allocate) {
for(j = 0; j < num_resource; j++) {
work[j] += allocate[i][j];
}
finish[i] = 1;
found = 1;
count++;
printf("Process %d allocated resources\n", i+1);
break;
}
}
}
if(!found) {
printf("Deadlock detected\n");
break;
}
}
return 0;
}
```
这个程序首先要求用户输入进程和资源的数量,然后分别输入每个进程已分配的资源数和需要的最大资源数,以及可用资源数。接下来,程序计算每个进程还需要的资源数,并输出资源分配图。最后,程序模拟资源分配过程并检测死锁。