Clojure’s immutable, persistent data structures encourage side-effect free programming that can easily scales across multiple processor cores. In this talk, we will explore the various features Clojure provides for dealing with concurrency:

• Atoms provide for synchronous, uncoordinated updates
• Agents provide a thread-safe mechanism for asynchronous, uncoordinated updates
• Futures are a convenient mechanism for execution on a separate thread
• Delays provide a way to defer work for one-time execution when needed
• Promises provide one-time delivery as a mechanism for coordination
• Software Transactional Memory (STM) provides a mechanism for managing references and updates across threads.
• Dynamic Vars support thread-local state.