Lock-free data structures pose an interesting problem for memory reclamation. After a node is unlinked from the data structure, the thread isn't sure it is not still in use by another thread. In many languages, this problem is sidestepped by having a global garbage collector that takes care of freeing the memory eventually. Let's talk about how this problem can be solved in a language that doesn't have a pervasive garbage collector, like C++ or Rust.