core.async is a Clojure library that brings asynchronous programming and communication to both Clojure and ClojureScript, enabling developers to write concurrent code using channels, go blocks, and CSP-style constructs rather than callbacks or threads. This project follows the version scheme MAJOR.MINOR.COMMITS where MAJOR and MINOR provide some relative indication of the size of the change, but do not follow semantic versioning. In general, all changes endeavor to be non-breaking (by moving to new names rather than by breaking existing names). COMMITS is an ever-increasing counter of commits since the beginning of this repository.

Features

  • go blocks for lightweight concurrent tasks that can pause and resume
  • Channels (chan) for communication between tasks
  • Parking operations for synchronous or blocking communication
  • Non-blocking alternatives
  • Thread pool management for behind-the-scenes task scheduling
  • A flow namespace providing a more structured flow abstraction (still evolving)

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License

Eclipse Public License

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Registered

2025-08-19