Method front

src/common/WorkQueue.h:369–375

    }

    T *front() {
      ceph_assert(ceph_mutex_is_locked(m_pool->_lock));
      if (m_items.empty()) {
        return NULL;
      }
      return m_items.front();
    }
    void requeue_front(T *item) {
      std::lock_guard pool_locker(m_pool->_lock);
      _void_process_finish(nullptr);