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October 20, 2014 18:26
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Banker's Algorithm in C
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#include<stdio.h> | |
#include<stdlib.h> | |
void print(int x[][10],int n,int m){ | |
int i,j; | |
for(i=0;i<n;i++){ | |
printf("\n"); | |
for(j=0;j<m;j++){ | |
printf("%d\t",x[i][j]); | |
} | |
} | |
} | |
//Resource Request algorithm | |
void res_request(int A[10][10],int N[10][10],int AV[10][10],int pid,int m) | |
{ | |
int reqmat[1][10]; | |
int i; | |
printf("\n Enter additional request :- \n"); | |
for(i=0;i<m;i++){ | |
printf(" Request for resource %d : ",i+1); | |
scanf("%d",&reqmat[0][i]); | |
} | |
for(i=0;i<m;i++) | |
if(reqmat[0][i] > N[pid][i]){ | |
printf("\n Error encountered.\n"); | |
exit(0); | |
} | |
for(i=0;i<m;i++) | |
if(reqmat[0][i] > AV[0][i]){ | |
printf("\n Resources unavailable.\n"); | |
exit(0); | |
} | |
for(i=0;i<m;i++){ | |
AV[0][i]-=reqmat[0][i]; | |
A[pid][i]+=reqmat[0][i]; | |
N[pid][i]-=reqmat[0][i]; | |
} | |
} | |
//Safety algorithm | |
int safety(int A[][10],int N[][10],int AV[1][10],int n,int m,int a[]){ | |
int i,j,k,x=0; | |
int F[10],W[1][10]; | |
int pflag=0,flag=0; | |
for(i=0;i<n;i++) | |
F[i]=0; | |
for(i=0;i<m;i++) | |
W[0][i]=AV[0][i]; | |
for(k=0;k<n;k++){ | |
for(i=0;i<n;i++){ | |
if(F[i] == 0){ | |
flag=0; | |
for(j=0;j<m;j++){ | |
if(N[i][j] > W[0][j]) | |
flag=1; | |
} | |
if(flag == 0 && F[i] == 0){ | |
for(j=0;j<m;j++) | |
W[0][j]+=A[i][j]; | |
F[i]=1; | |
pflag++; | |
a[x++]=i; | |
} | |
} | |
} | |
if(pflag == n) | |
return 1; | |
} | |
return 0; | |
} | |
//Banker's Algorithm | |
void accept(int A[][10],int N[][10],int M[10][10],int W[1][10],int *n,int *m){ | |
int i,j; | |
printf("\n Enter total no. of processes : "); | |
scanf("%d",n); | |
printf("\n Enter total no. of resources : "); | |
scanf("%d",m); | |
for(i=0;i<*n;i++){ | |
printf("\n Process %d\n",i+1); | |
for(j=0;j<*m;j++){ | |
printf(" Allocation for resource %d : ",j+1); | |
scanf("%d",&A[i][j]); | |
printf(" Maximum for resource %d : ",j+1); | |
scanf("%d",&M[i][j]); | |
} | |
} | |
printf("\n Available resources : \n"); | |
for(i=0;i<*m;i++){ | |
printf(" Resource %d : ",i+1); | |
scanf("%d",&W[0][i]); | |
} | |
for(i=0;i<*n;i++) | |
for(j=0;j<*m;j++) | |
N[i][j]=M[i][j]-A[i][j]; | |
printf("\n Allocation Matrix"); | |
print(A,*n,*m); | |
printf("\n Maximum Requirement Matrix"); | |
print(M,*n,*m); | |
printf("\n Need Matrix"); | |
print(N,*n,*m); | |
} | |
int banker(int A[][10],int N[][10],int W[1][10],int n,int m){ | |
int j,i,a[10]; | |
j=safety(A,N,W,n,m,a); | |
if(j != 0 ){ | |
printf("\n\n"); | |
for(i=0;i<n;i++) | |
printf(" P%d ",a[i]); | |
printf("\n A safety sequence has been detected.\n"); | |
return 1; | |
}else{ | |
printf("\n Deadlock has occured.\n"); | |
return 0; | |
} | |
} | |
int main(){ | |
int ret; | |
int A[10][10]; | |
int M[10][10]; | |
int N[10][10]; | |
int W[1][10]; | |
int n,m,pid,ch; | |
printf("\n DEADLOCK AVOIDANCE USING BANKER'S ALGORITHM\n"); | |
accept(A,N,M,W,&n,&m); | |
ret=banker(A,N,W,n,m); | |
if(ret !=0 ){ | |
printf("\n Do you want make an additional request ? (1=Yes|0=No)"); | |
scanf("%d",&ch); | |
if(ch == 1){ | |
printf("\n Enter process no. : "); | |
scanf("%d",&pid); | |
res_request(A,N,W,pid-1,m); | |
ret=banker(A,N,W,n,m); | |
if(ret == 0 ) | |
exit(0); | |
} | |
}else | |
exit(0); | |
return 0; | |
} |
Can you give me 1 input for testing. Thank you very much <3
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Thank u so much!!