C语言编程,实现fifo页面调度算法,可以自定义内存块数和页面序列,要求最后能输出每一步调度的具体过程,并计算命中次数、命中率、缺页率、缺页次数
时间: 2024-01-06 07:04:36 浏览: 71
下面是使用C语言实现FIFO页面调度算法的代码:
```c
#include <stdio.h>
#include <stdlib.h>
#define MAX_FRAMES 10
int main()
{
int frames[MAX_FRAMES], pages[MAX_FRAMES];
int num_frames, num_pages, page_faults = 0, hit_count = 0;
int frame_index = 0, page_index = 0;
printf("Enter the number of frames: ");
scanf("%d", &num_frames);
printf("Enter the number of pages: ");
scanf("%d", &num_pages);
printf("Enter the page sequence:\n");
for (int i = 0; i < num_pages; i++)
{
scanf("%d", &pages[i]);
}
for (int i = 0; i < num_frames; i++)
{
frames[i] = -1;
}
printf("\nPage Faults:\n");
for (int i = 0; i < num_pages; i++)
{
int page_found = 0;
// Check if page is already in frame
for (int j = 0; j < num_frames; j++)
{
if (frames[j] == pages[i])
{
page_found = 1;
hit_count++;
break;
}
}
// If page not found, replace the oldest page in frame with new page
if (!page_found)
{
frames[frame_index] = pages[i];
frame_index = (frame_index + 1) % num_frames;
page_faults++;
// Print the current state of frames
for (int j = 0; j < num_frames; j++)
{
printf("%d ", frames[j]);
}
printf("\n");
}
}
float hit_rate = (float) hit_count / num_pages * 100;
float miss_rate = (float) page_faults / num_pages * 100;
printf("\nHit Count: %d\n", hit_count);
printf("Hit Rate: %.2f%%\n", hit_rate);
printf("Miss Rate: %.2f%%\n", miss_rate);
printf("Page Faults: %d\n", page_faults);
return 0;
}
```
在上述代码中,我们首先接收用户输入的内存块数和页面序列,然后初始化一个用于存储页面的数组和一个用于存储内存块的数组。接着,我们使用一个循环遍历页面序列,并在每次循环中检查当前页面是否已经在内存块中。如果页面已经在内存块中,则表示命中,hit_count加一;否则,我们将最老的页面替换成当前页面,并将page_faults加一。在替换页面后,我们会打印出当前内存块的状态。循环结束后,我们计算并输出命中率、缺页率、缺页次数等信息。
希望这个代码能够对你有所帮助!
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