Method get_reference

be/src/util/cache/lirs-cache.cc:286–295

The caller must be holding the mutex_.

  // The caller must be holding the mutex_.
  void get_reference() {
    modify_atomic_state([](AtomicState& cur_state) {
        // Check whether the reference count would wrap. There is no use case that
        // currently needs to exceed 65k concurrent references, and this is likely
        // to be a bug in the caller's code. For now, this asserts, but there may be
        // a better behavior if needed.
        CHECK_LT(cur_state.ref_count, std::numeric_limits<uint16_t>::max());
        ++cur_state.ref_count;
      });
  }
};

struct LIRSThreadState {