C语言磁盘调度算法最短时间优先
时间: 2023-10-08 20:14:34 浏览: 88
下面是C语言实现磁盘调度算法最短时间优先的示例代码:
```c
#include <stdio.h>
#include <stdlib.h>
#include <limits.h>
#define REQUEST_NUM 8 // 磁盘请求的数量
#define START_POS 50 // 磁头起始位置
// 计算两个数之间的绝对值
int abs(int a, int b) {
return (a > b) ? (a - b) : (b - a);
}
// 查找最短距离的磁道
int find_shortest(int *requests, int size, int curr_pos) {
int shortest = INT_MAX;
int shortest_idx = -1;
for (int i = 0; i < size; i++) {
if (requests[i] != -1) {
int distance = abs(curr_pos, requests[i]);
if (distance < shortest) {
shortest = distance;
shortest_idx = i;
}
}
}
return shortest_idx;
}
// SSTF 磁盘调度算法
void sstf(int *requests, int size, int start_pos) {
int curr_pos = start_pos;
int total_time = 0;
for (int i = 0; i < size; i++) {
int shortest_idx = find_shortest(requests, size, curr_pos);
int shortest = abs(curr_pos, requests[shortest_idx]);
curr_pos = requests[shortest_idx];
requests[shortest_idx] = -1;
total_time += shortest;
}
printf("SSTF 磁盘调度算法总移动距离: %d\n", total_time);
}
int main() {
int requests[REQUEST_NUM] = {55, 58, 39, 18, 90, 160, 150, 38};
sstf(requests, REQUEST_NUM, START_POS);
return 0;
}
```
上述代码实现了SSTF磁盘调度算法,包括查找最短距离的磁道和计算总移动距离等操作。在main函数中,我们定义了8个磁盘请求,起始位置为50,并调用sstf函数进行磁盘调度。输出结果为SSTF磁盘调度算法总移动距离。
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