Safe memory reclamation

The concurrency problem of deciding when it is safe to free a node in a lock-free data structure, solved by deferral schemes such as hazard pointers, epoch-based reclamation and RCU that reclaim memory only once no thread can still hold a reference.

grounded in: latest AI/tech trends theme: 'Rust and the hard edges of systems concurrency' — lock-free structures raise the reclamation problem that ties the existing lock-free/ABA/use-after-free concepts together