Method push

dali/util/thread_safe_queue.h:29–35

class ThreadSafeQueue {
 public:
  void push(T item) {
    {
      std::lock_guard<std::mutex> lock(lock_);
      queue_.push(std::move(item));
    }
    cond_.notify_one();
  }

  T pop() {
    std::unique_lock<std::mutex> lock{lock_};