Method _void_dequeue

src/common/WorkQueue.h:343–353

      return m_items.empty();
    }
    void *_void_dequeue() override {
      ceph_assert(ceph_mutex_is_locked(m_pool->_lock));
      if (m_items.empty()) {
        return NULL;
      }

      ++m_processing;
      T *item = m_items.front();
      m_items.pop_front();
      return item;
    }
    void _void_process(void *item, ThreadPool::TPHandle &handle) override {
      process(reinterpret_cast<T *>(item));
    }