ICallGraphBuilderSvc Node1 ICallGraphBuilderSvc + ~ICallGraphBuilderSvc() + openNode() + closeNode() + interfaceID() Node3 PerfMon::CallGraphBuilderSvc - m_mutex - ATLAS_THREAD_SAFE - ATLAS_THREAD_SAFE - ATLAS_THREAD_SAFE - ATLAS_THREAD_SAFE - ATLAS_THREAD_SAFE + CallGraphBuilderSvc() + ~CallGraphBuilderSvc() + initialize() + finalize() + queryInterface() + openNode() + closeNode() + interfaceID() - CallGraphBuilderSvc() Node1->Node3 Node2 IInterface Node2->Node1