CSL-204-Operating-Systems-Lab/_10.bankers.c at main · rxhith/CSL-204-Operating-Systems-Lab · GitHub

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#include<stdio.h>
#include<stdlib.h>
int max[100][100];
int alloc[100][100];
int need[100][100];
int avail[100];

int n,r;
void input();
void show();
void cal();


int main()
{
   int i,j,b;
   printf("********** Banker's Algo ************\n");
   input();
   show();
   cal();
   printf("\nEnter the resources requested immediately: ");
  for(j=0;j<r;j++)
  {
    scanf("%d",&b);
    avail[j]-=b;
  }
  //show();
  cal();
  return 0;
}

void input()
{
  int i,j;
  printf("Enter the no of Processes\t");
   scanf("%d",&n);
  printf("Enter the no of resources instances\t");
   scanf("%d",&r);
  printf("Enter the Max Matrix\n");
  for(i=0;i<n;i++)
  {
    for(j=0;j<r;j++)
    {
      scanf("%d",&max[i][j]);
    }
  }
  printf("Enter the Allocation Matrix\n");
  for(i=0;i<n;i++)
  {
    for(j=0;j<r;j++)
     {
	scanf("%d",&alloc[i][j]);
     }

  }
  printf("Enter the available Resources\n");
  for(j=0;j<r;j++)
  {
	scanf("%d",&avail[j]);
  }
}

//to display allocation,max and available matrices
void show()
{
   int i,j;
   printf("Process\t Allocation\t Max\t Available\t");
   for(i=0;i<n;i++)
   {
	printf("\nP%d\t ",i+1);
	for(j=0;j<r;j++)
	{
	   printf("%d ",alloc[i][j]);
	}
	printf("\t");
	for(j=0;j<r;j++)
	{
	  printf("%d ",max[i][j]);
	}
	printf("\t");
	if(i==0)
	{
	   for(j=0;j<r;j++)
  		printf("%d ",avail[j]);
	}
  }
}

//for calculation of safe state
void cal()
{
    int finish[100],temp,need[100][100],flag=1,k,c1=0;
    int safe[100];
    int i,j;
	for(i=0;i<n;i++)
	{
	   finish[i]=0;
        }
	//find need matrix
	for(i=0;i<n;i++)
	{
	   for(j=0;j<r;j++)
	   {
		need[i][j]=max[i][j]-alloc[i][j];
	   }
	}
	printf("\n");
	while(flag)
	{
	   flag=0;
	   for(i=0;i<n;i++)
	   {
		int c=0;
		for(j=0;j<r;j++)
		{
			if((finish[i]==0)&&(need[i][j]<=avail[j]))
			{
				c++;
			        if(c==r)
				{
				    for(k=0;k<r;k++)
				    {
					avail[k]+=alloc[i][j];
					finish[i]=1;
					flag=1;
				    }
				    printf("P%d->",i);
				    if(finish[i]==1)
				     {
					i=n;
				     }
				}
			}
		}
	}
	}
	for(i=0;i<n;i++)
	{
	   if(finish[i]==1)
	   {
		c1++;
	   }
	   else
	   {
		printf("P%d->",i);
	   }

	}
	if(c1==n)
	{
	   printf("\n The system is in safe state");
	}
	else
	{
	   printf("\n Process are in dead lock");
	   printf("\n System is in unsafe state");
	}
}