performance and scalability 3.So Procrastinate away! Use Structured Deferral 4.Shared_ptr vs atomic_shared_ptr vs hazard pointers vs Read Copy Update (RCU) 5.Hazard Pointers 6.Read Copy Update 7.A Concurrency These are cell, hazard ptr and RCU. These extend the existing shared_ptr and the proposed atomic_shared_ptr which all have safe reclamation facilities. As such we also propose moving shared_ptr and atomic> These are cell, hazard ptr and RCU. These extend the existing shared_ptr and the proposed atomic_shared_ptr which all have safe reclamation facilities. As such we also propose moving shared_ptr and atomic>