G4UA::CelerOffload Node1 G4UA::CelerOffload   + CelerOffload() + BeginOfRunAction() + EndOfRunAction() Node2 AthMessaging - m_msg_tls - ATLAS_THREAD_SAFE + AthMessaging() + AthMessaging() + ~AthMessaging() + msgLvl() + msg() + msg() + setLevel() - AthMessaging() - AthMessaging() - operator=() - initMessaging() Node2->Node1 Node3 std::string     Node3->Node2 -m_nm Node4 std::basic_string< Char >     Node4->Node3 Node5 std::atomic< IMessageSvc * > + ptr   Node5->Node2 -m_imsg Node6 std::atomic< MSG::Level > + ptr   Node6->Node2 -m_lvl Node7 G4UserRunAction     Node7->Node1