In the event LGPL is too restrictive, there's also concurrencykit (http://concurrencykit.org/ http://concurrencykit.org/), which provides similar mechanisms (bo

In the event LGPL is too restrictive, there's also concurrencykit (http://concurrencykit.org/ http://concurrencykit.org/), which provides similar mechanisms (both for concurrent memory reclamation and various datastructures built on top).