ruby-concurrency/concurrent-ruby

Health v2 · maintenance only

Flags: no_license

Adoption not part of the score

5831 stars · 415 forks observed · 2026-08-28

What it is AI-extracted, prompt v1, taxonomy v1, 2026-08-29, confidence not recorded

A Ruby gem providing modern concurrency abstractions such as futures, promises, agents, thread pools, and supervisors, inspired by Erlang, Clojure, Scala, and Java. It offers strong thread-safety guarantees across MRI, JRuby, and TruffleRuby with no external dependencies.

Use cases

• run async tasks with futures and promises in ruby
• manage a thread pool for background jobs
• share mutable state safely between threads
• implement actor-style concurrency in ruby
• avoid race conditions with thread-safe data structures
• parallelize work across ruby interpreters

When to choose

• you need battle-tested, thread-safe concurrency primitives in Ruby
• you want a dependency-free toolbox that works on MRI, JRuby, and TruffleRuby
• you need futures, promises, or thread pools without pulling in a full framework

When to avoid

• you need distributed or multi-process concurrency rather than in-process threading
• you want an opinionated async framework with scheduling and supervision built into a larger ecosystem
• your project is not Ruby

Facets

library · maturity stable

concurrency developer-tools programming-languages ruby jvm cross-platform futures promises thread-pools actors thread-safety gem

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