TYBcs OS-Syspro Slip 23-2 | IProgramX

#include<stdio.h>
#define MAX 10

int m,n,total[MAX],avail[MAX],alloc[MAX][MAX],
    max[MAX][MAX],need[MAX][MAX],work[MAX],finish[MAX],
    seq[MAX],request[MAX];

void accept()
{
int i,j;

printf("Enter no.of process:");
scanf("%d",&n);

printf("Enter no.of resource types:");
scanf("%d",&m);

printf("Enter total no.of resources of each resource type:\n");

for(i=0;i<m;i++)
{
printf("%c:",65+i);
scanf("%d",&total[i]);
}

printf("Enter no.of allocated resources of each resource type by each process:\n");

for(i=0;i<n;i++)
{
printf("P%d:\n",i);
for(j=0;j<m;j++)
{
printf("%c:",65+j);
scanf("%d",&alloc[i][j]);
}
}

printf("Enter no.of maximum resources of each resource type by each process:\n");

for(i=0;i<n;i++)
{
printf("P%d:\n",i);
for(j=0;j<m;j++)
{
printf("%c:",65+j);
scanf("%d",&max[i][j]);
}
}
}

void calc_avail()
{
int i,j,s;

for(j=0;j<m;j++)
{
s=0;
for(i=0;i<n;i++)
s+=alloc[i][j];

avail[j] = total[j] - s;
}
}

void calc_need()
{
int i,j;

for(i=0;i<n;i++)
for(j=0;j<m;j++)
need[i][j]=max[i][j]-alloc[i][j];
}

void print()
{
int i,j;

printf("\tAllocation\tMax\tNeed\n\t");

for(i=0;i<3;i++)
{
for(j=0;j<m;j++)
printf("%3c",65+j);
printf("\t");
}

printf("\n");
for(i=0;i<n;i++)
{
printf("P%d\t",i);
for(j=0;j<m;j++)
printf("%3d",alloc[i][j]);
printf("\t");
for(j=0;j<m;j++)
printf("%3d",max[i][j]);
printf("\t");
for(j=0;j<m;j++)
printf("%3d",need[i][j]);
printf("\n");
}

printf("Available\n");
for(j=0;j<m;j++)
printf("%3c",65+j);
printf("\n");
for(j=0;j<m;j++)
printf("%3d",avail[j]);

printf("\n");
}

int check(int s)
{
int i,j;

i = s;
do
{
if(!finish[i])
{
for(j=0;j<m;j++)
{
if(need[i][j]>work[j])
break;
}

if(j==m) return i;
}

i=(i+1)%n;
}while(i!=s);

return -1;
}

void banker()
{
int i,j,k=0;

for(i=0;i<n;i++)
finish[i]=0;

for(j=0;j<m;j++)
work[j] = avail[j];

i=0;
while((i=check(i))!=-1)
{
printf("Process P%d resource granted.\n",i);
finish[i] = 1;

for(j=0;j<m;j++)
work[j] += alloc[i][j];

printf("finish(");
for(j=0;j<n;j++)
printf("%d,",finish[j]);
printf("\b)\nwork(");
for(j=0;j<m;j++)
printf("%d,",work[j]);
printf("\b)\n");

seq[k++]=i;

i=(i+1)%n;
}

if(k==n)
{
printf("System is in safe state.\n");
printf("Safe sequence:");
for(j=0;j<n;j++)
printf("P%d ",seq[j]);
}
else
{
printf("System is not in safe state.");
}
printf("\n");
}

int main()
{
int i,j,pno;

accept();
calc_avail();
calc_need();
print();
banker();

printf("Enter process no:");
scanf("%d",&pno);

printf("Enter resource request of process P%d\n",pno);

for(j=0;j<m;j++)
{
printf("%c:",65+j);
scanf("%d",&request[j]);
}

for(j=0;j<m;j++)
{
if(request[j]>need[pno][j])
break;
}

if(j==m)
{
for(j=0;j<m;j++)
{
if(request[j]>avail[j])
break;
}

if(j==m)
{
for(j=0;j<m;j++)
{
avail[j]-=request[j];
alloc[pno][j]+=request[j];
need[pno][j]-=request[j];
print();
banker();
}
}
else
printf("Process P%d must wait.\n",pno);
}
else
printf("Process P%d has exceeded its maximum claim\n",pno);

return 0;
}