lockfreequeues

Lock-free queues for Nim, implemented as ring buffers.

Three implementations are provided:

• Sipsic is a single-producer, single-consumer bounded queue. Pushing and popping are wait-free.
• Mupsic is a multi-producer, single-consumer bounded queue. Popping is wait-free.
• Mupmuc is a multi-producer, multi-consumer bounded queue.

API documentation: https://elijahr.github.io/lockfreequeues

Installation

nimble install lockfreequeues

Examples

Examples are located in the examples directory and can be compiled and run with:

nimble examples

Reference

• Juho Snellman's post "I've been writing ring buffers wrong all these years" (alt)
• Mamy Ratsimbazafy's research on SPSC channels for weave.
• Henrique F Bucher's post "Yes, You Have Been Writing SPSC Queues Wrong Your Entire Life" (alt)

Many thanks to Mamy Ratsimbazafy for reviewing the initial release and offering suggestions.

Contributing

• Pull requests and feature requests are welcome!
• Please file any issues you encounter.
• For pull requests, please see the contribution guidelines.

Running tests

Tests can be run locally with nimble test.

CI runs the test suite for both C and C++ targets on:

• Linux x86_64 and aarch64
• macOS x86_64

The test suite is also run with LLVM thread sanitization to check for data races.

Linting

This project uses lintball to auto-format code. Please ensure your changeset passes linting. Enable the githooks with:

git config --local core.hooksPath .githooks