Swift async/await based socket


Swift async/await based socket library


This library exposes an idiomatic Swift API for interacting with POSIX sockets via an async/await interface. What makes this library unique (even to the point that Swift NIO is still using a custom socket / thread pool) is that it was built exclusively using Swift Concurrency and doesn't use old blocking C APIs, CFSocket, DispatchIO, CFRunloop, GCD, or explicitly create a single thread outside of the Swift's global cooperative thread pool to manage the sockets and polling.

The result is a Socket API that is optimized for async/await and built from the group up. Additionally, like the System, and Concurrency APIs, the Socket is represented as a struct instead of a class, greatly reducing ARC overhead. The internal state for the socket is managed by a singleton that stores both its state, and keeps an array of managed file descriptors so polling is global.


  • Minimal overhead for Swift Async/Await
  • Minimal ARC overhead, keep state outside of Socket
  • Avoid thread explosion and overcomitting the system
  • Use actors to prevent blocking threads
  • Optimize polling and C / System API usage
  • Low energy usage and memory overhead


  • Swift Tools 5.7.0
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Last updated: Sun Jun 02 2024 04:04:10 GMT-0900 (Hawaii-Aleutian Daylight Time)