int ticketNumber;
int turnNumber;

int atomicIncrement (int *var) {
  int tmp = *var;
  *var = tmp + 1;
  return (tmp);
}

void init() {
	ticketNumber = 0;
	turnNumber = 0;
}

void lock() {
	int ticket = atomicIncrement(&ticketNumber);

	while (ticket != turnNumber);

void unlock() {
	atomicIncrement(turnNumber);
}

int main() {


}