int main(void)
{
char user[10], pass[10];
int logres, seats, bookres, bookch, loginch, usercheck;
int maxseats = 20; //hardcoded max seats available
system("cls");
printf("\nWelcome to Railway booking system!\n");
//Provide option to login or sign up
printf("1. Press 1 to Login if you have already signed up.\n");
printf("2. Press 2 to Sign Up.\n\n");
printf("Your Choice?: ");
scanf("%d", &loginch);
usercheck = logincheck(loginch); //Check if user opted for login or sign-up
if(usercheck == 1) //user opted for login in loginch, logincheck() returns 1
{
A: //label to return to login after sign-up
printf("\nUser Login:\nPlease enter your username and password:\n");
printf("Username: "******"%s", user);
printf("Password: "******"%s", pass);
logres = login(user, pass); //call to login, checks if user name and pass are correct
if(logres == 1) //login success if login returns 1 above, ie. user name and pass are correct
{
printf("Login successful!\n\nPlease proceed for booking!\n20 Seats available!");
printf("\nPlease enter number of seats: ");
scanf("%d", &seats);
bookres = booking(seats, maxseats); //allow booking only if login success,
//call booking() with no of seats user enters and max seats
if(bookres == 1)//booking() above checks if enough seats are available, returns 1 if available
{
printf("\nEnough seats available! Proceed for booking.\n\n");
//Allow class selection if seats available
printf("Please select your class:\n");
printf("1.Enter 1 for AC 1 Tier.\n");
printf("2.Enter 2 for AC 2 Tier.\n");
printf("3.Enter 3 for AC 3 Tier.\n");
printf("4.Enter 4 for Sleeper.\n");
printf("\nYour choice?: ");
scanf("%d", &bookch);
maxseats = bookmenu(bookch, seats, maxseats); //Actual Booking, call to bookmenu()
}
else //booking returns 0 if user entered seats exceeds available seats
{
printf("Not enough seats!");
}
}
else //login returns 0 if username OR pass is incorrect, comparison fails
{
printf("Invalid username or password!");
}
}
else if(usercheck == 2)//user opted for sign-up, logincheck() returns 2
{
createuser();//Call user creation module
system("cls");
goto A; //continue with login, after user creation
}
printf("\n\nThank You for using the Railway booking system. Press any key to exit!");
getche();
return 0;
}
/* A worker thread receives a number and a 4-letter name via targ */
void * tmain(void * targ)
{
/* Local variables are not shared with other threads */
int no, i;
char name[5];
pthread_t tid;
int isBooked[t];//Tells how many times train i has been booked by this thread.
memset(isBooked, 0, sizeof(isBooked));
int trainsBooked[t];//Tells which all trains have been booked by this thread
int numTrainsBooked = 0;//Count of the number of trains booked by this thread
/* Retrieve my number and name from the parameter passed */
no = ((tinfo *)targ) -> tno;
strcpy(name,((tinfo *)targ) -> tname);
/* Retrieve my thread id */
tid = pthread_self();
while (1) {
/* Check for termination condition */
pthread_mutex_lock(&donemutex);
/* if the master thread is done */
if(mdone)
{
pthread_mutex_unlock(&donemutex);
pthread_barrier_wait(&barrier);
pthread_exit(NULL);
}
/* The master thread is still sleeping, so I continue to work */
pthread_mutex_unlock(&donemutex);
//Check if number of active queries is less than MAX
pthread_mutex_lock(&querymutex);
if(numActiveQueries == MAX)
{
printf("\nThread %d : Blocked since active queries = MAX\n", no);
pthread_cond_wait(&querycond, &querymutex);
}
numActiveQueries++;
pthread_mutex_unlock(&querymutex);
int a123;
//Start query
int queryType = 1 + rand()%3;
if(queryType == INQUIRE)
{
inquiry(no);
}
else if(queryType == BOOK)
{
booking(no, isBooked, trainsBooked, &numTrainsBooked);
}
else
{
cancellation(no, isBooked, trainsBooked, &numTrainsBooked);
}
pthread_mutex_lock(&querymutex);
numActiveQueries--;
if(numActiveQueries == (MAX-1))//wake up a waiting query
pthread_cond_signal(&querycond);
pthread_mutex_unlock(&querymutex);
sleep(SLEEPTIME);
}
}
