// Using conditional variable and mutex
void function_1() {
	int count = 10;
	while (count > 0) {
		std::unique_lock<mutex> locker(mu);
		q.push_front(count);
		locker.unlock();
		cond.notify_one();  // Notify one waiting thread, if there is one.
		std::this_thread::sleep_for(chrono::seconds(1));
		count--;
	}
}

void function_2() {
	int data = 0;
	while ( data != 1) {
		std::unique_lock<mutex> locker(mu);
		cond.wait(locker, [](){ return !q.empty();} );  // Unlock mu and wait to be notified
			// relock mu
		data = q.back();
		q.pop_back();
		locker.unlock();
		cout << "t2 got a value from t1: " << data << endl;
	}
}

int main() {
	std::thread t1(function_1);
	std::thread t2(function_2);
	t1.join();
	t2.join();
	return 0;
}