Use the threadlock function in your class definition to automatically run instance methods inside of an instance-wide re-entrant lock (Monitor). All locked methods in an instance are protect by a single lock. You can protect all or some of your methods from being run asynchronously. The goal is to be able to easily make basic objects threadsafe with as little thought and code as using the attr_accessor family of functions to make your instance attributes accessible. The codebase is small and I intend to keep it that way, but bug reports and patches are welcome. Enjoy.