OS-practical-programs/FIFO.c at main · niharn22/OS-practical-programs · GitHub

1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
#include <stdio.h>
int main()
{
    int incomingStream[] = {4, 1, 2, 4, 5};
    int pageFaults = 0;
    int frames = 3;
    int i, j, s, pages;

    pages = sizeof(incomingStream)/sizeof(incomingStream[0]);

    printf("Incoming \t Frame 1 \t Frame 2 \t Frame 3");
    int temp[frames];
    for(i = 0; i < frames; i++)
    {
        temp[i] = -1;
    }

    for(i = 0; i < pages; i++)
    {
        s = 0;

        for(j = 0; j < frames; j++)
        {
            if(incomingStream[i] == temp[j])
            {
                s++;
                pageFaults--;
            }
        }
        pageFaults++;

        if((pageFaults <= frames) && (s == 0))
        {
            temp[i] = incomingStream[i];
        }
        else if(s == 0)
        {
            temp[(pageFaults - 1) % frames] = incomingStream[i];
        }

        printf("\n");
        printf("%d\t\t\t",incomingStream[i]);
        for(j = 0; j < frames; j++)
        {
            if(temp[j] != -1)
                printf(" %d\t\t\t", temp[j]);
            else
                printf(" - \t\t\t");
        }
    }
    printf("\nTotal page hits:\t%d",(pages-pageFaults));
    printf("\nTotal Page Faults:\t%d\n", pageFaults);
    return 0;
}