Method push

BlockingQueue.h:9–13

template<typename ITEM> class BlockingQueue{
public:
	void push(const ITEM& value) { // push
		std::lock_guard<Mutex> lock(mutex);
		queue.push(std::move(value));
		condition.notify_one();
	}
	bool try_pop(ITEM& value) { // non-blocking pop
		std::lock_guard<Mutex> lock(mutex);
		if (queue.empty()) return false;