mitchellh/libxev

Health v2 · maintenance only

Flags: no_releases

Adoption not part of the score

3572 stars · 187 forks observed · 2026-08-28

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

libxev is a cross-platform, high-performance event loop library written in Zig that provides a unified proactor-style API for non-blocking IO, timers, signals, and events. It works on Linux (io_uring/epoll), macOS (kqueue), and WebAssembly (WASI and browser), and exposes both a Zig and C-compatible API.

Use cases

• build a high-performance async event loop for a network server
• write non-blocking TCP/UDP socket code across Linux and macOS
• run an event loop in WebAssembly or WASI environments
• replace libuv with a zero-runtime-allocation event loop
• schedule timers and process management in a Zig or C application
• offload blocking file IO to a shared thread pool

When to choose

• you need a libuv-style generalized event loop in Zig or C
• you want io_uring-style proactor semantics across multiple OS backends
• you target WebAssembly/WASI and need async IO without Emscripten
• predictable performance with zero runtime allocations matters, e.g. embedded or terminals

When to avoid

• you need mature Windows support (still planned)
• you want a batteries-included async runtime with tasks and futures like Tokio
• your stack is far from C/Zig and higher-level language runtimes suffice

Facets

library · maturity stable

concurrency networking http-server developer-tools developer-tools networking cross-platform performance backend wasm cross-platform cpp rust go event-loop io-uring kqueue epoll proactor async-io zig c-api wasi non-blocking-io timers linux macos

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