-
Notifications
You must be signed in to change notification settings - Fork 0
/
fcfs.c
85 lines (85 loc) · 1.72 KB
/
fcfs.c
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
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
#include<stdio.h>
int fts =0;
struct process
{
char name[20];
int arrival_time;
int burst_time;
int st_time;
int ft_time;
int waiting_time;
int turn_time;
}p[50];
int main()
{
int n,i,j;
int wavg=0,tavg = 0;
int a[10];
printf("enter number of processes in ready queue \n");
scanf ("%d",&n);
for (i=0;i<n;i++)
{
printf("enter process name \n");
scanf ("%s",p[i].name);
printf("enter arrival time \n");
scanf ("%d",&p[i].arrival_time);
printf ("enter burst time \n");
scanf ("%d",&p[i].burst_time);
}
for (i=0;i<n;i++)
{
a[i]=p[i].arrival_time;
}
//printf ("\n");
for(i=0;i<n-1;i++)
{
for (j=0;j<n-i-1;j++)
{
if(a[j]>a[j+1])
{
int temp;
temp=a[j];
a[j]=a[j+1];
a[j+1]=temp;
}
}
}
for(i=0;i<n;i++)
{
for (j=0;j<n;j++)
{
if(a[i]==p[j].arrival_time)
{
if(a[i]<fts)
{
p[j].st_time=fts;
p[j].ft_time=p[j].st_time+p[j].burst_time;
fts=p[j].ft_time;
}
else
{
p[j].st_time=p[j].arrival_time;
p[j].ft_time=p[j].st_time+p[j].burst_time;
fts=p[j].ft_time;
}
}
}
}
for(i=0;i<n;i++)
{
p[i].waiting_time=p[i].st_time - p[i].arrival_time;
p[i].turn_time = p[i].waiting_time + p[i].burst_time;
}
printf("process_name arrival_time burst_time start_time finish_time waiting_time turnaround_time\n");
for (i=0;i<n;i++)
{
printf("%s\t\t %d\t\t %d\t\t %d\t\t %d\t\t %d\t\t %d\n",p[i].name,p[i].arrival_time,p[i].burst_time,p[i].st_time,p[i].ft_time,p[i].waiting_time,p[i].turn_time);
}
for(i=0;i<n;i++)
{
wavg = wavg+p[i].waiting_time;
tavg = tavg + p[i].turn_time;
}
printf("Average waiting time is : %d \n",(wavg)/2);
printf("Average Turn around time is : %d \n",(tavg)/2);
}