Concurrent Processing

Tools that simplify the writing of concurrent Ruby programs

The project is in a healthy, maintained state
Async provides a modern asynchronous I/O framework for Ruby, based on nio4r. It implements the reactor pattern, providing both IO and timer based events.
A long-lived project that still receives updates
Modern concurrency tools including agents, futures, promises, thread pools, actors, supervisors, and more. Inspired by Erlang, Clojure, Go, JavaScript, actors, and classic concurrency patterns.
The project is in a healthy, maintained state
{Eventbox} objects are event based and single threaded from the inside but thread-safe and blocking from the outside. Eventbox enforces a separation of code for event processing and code running blocking operations. Code inside an {Eventbox} object is executed non-concurrently and hence shouldn't do any blocking operations. This is similar to the typical JavaScript programming style.
No release in over a year
EventMachine implements a fast, single-threaded engine for arbitrary network communications. It's extremely easy to use in Ruby. EventMachine wraps all interactions with IP sockets, allowing programs to concentrate on the implementation of network protocols. It can be used to create both network servers and clients. To create a server or client, a Ruby program only needs to specify the IP address and port, and provide a Module that implements the communications protocol. Implementations of several standard network protocols are provided with the package, primarily to serve as examples. The real goal of EventMachine is to enable programs to easily interface with other programs using TCP/IP, especially if custom protocols are required.