Problem:9.1

Write a program that will create three user level threads. Inside first thread you have to perform a withdraw operation, inside second thread display the balance, and inside third thread a deposit operation is performed. In the main function create a child and inside the child create a menu to perform withdraw and deposit operation by calling the two threads. After each operation display thread is called to see the balance. Inside the parent method just display "Operations are done! Congrats”. You must ensure that the main function must wait until all the child and thread execution terminated.

Run :

#include<pthread.h>
#include<stdio.h>
#include <sys/types.h>
#include<sys/wait.h>
#include <unistd.h>
    int bal = 0;
    void *withdraw(void *param);
    void *deposit(void *param);
    void *display(void *param);
            //main fuction ; 
int main(int argc,char *argv[]) {
    int pid;
    pthread_t tid1,tid2,tid3;
    int choi=0,dip,wit;
    pid=fork();
        if(pid==0){
            while(choi != 3){
                
            printf("===Manu===\n");
            printf("choice 1 for diposit: \n");
            printf("choice 2 for withdrow: \n");
            printf("choice 3 for exit\n");
            
            scanf("%d",&choi);
            if(choi ==1){
                printf("diposit value: ");
                scanf("%d",&dip);
                pthread_create(&tid2,NULL,deposit,&dip);
                pthread_join(tid1,NULL);
                 pthread_create(&tid3,NULL,display,NULL);
                pthread_join(tid3,NULL);
            }
            if(choi ==2){
                printf("withdraw value: ");
                scanf("%d",&wit);
                pthread_create(&tid1,NULL,withdraw,&wit);
                pthread_join(tid2,NULL); 
                 pthread_create(&tid3,NULL,display,NULL);
                 pthread_join(tid3,NULL);
            }
            if(choi == 3){
                choi = 3;
            }
                
            }
        }else if(pid>0){
            wait(NULL);
        printf("\n\nOperations are Done ! congrats");
}
}
            //withdraw function
void *withdraw(void *param){
    int* value = (int*)param;
    bal = bal - *value;
    pthread_exit(0);
}
                //deposit function
void *deposit(void *param){
    
    int* value = (int*)param;
    bal = bal + *value;
pthread_exit(0);
}
void *display(void *param){
     //int* value = (int*)param;
     
     printf("courrent value: %d\n",bal);
    pthread_exit(0);
}

Output: