nexio 0.2.6

A thread-per-core async runtime with owned-buffer I/O: io_uring on Linux (cancellation layer checked by Miri and Kani), a portable epoll/kqueue/IOCP backend elsewhere
Documentation 
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//! Chooses the I/O backend at build time.
//!
//! * Linux (default): `nexio_uring`, the io_uring backend.
//! * Every other OS, or Linux with the `poll` feature: `nexio_poll`, the
//!   portable readiness backend (epoll / kqueue / IOCP via the `polling` crate).

fn main() {
    println!("cargo:rustc-check-cfg=cfg(nexio_uring)");
    println!("cargo:rustc-check-cfg=cfg(nexio_poll)");
    println!("cargo:rustc-check-cfg=cfg(nexio_runtime_fallback)");
    println!("cargo:rerun-if-changed=build.rs");
    println!("cargo:rerun-if-env-changed=CARGO_FEATURE_POLL");
    println!("cargo:rerun-if-env-changed=CARGO_FEATURE_RUNTIME_FALLBACK");

    let linux = std::env::var("CARGO_CFG_TARGET_OS")
        .map(|os| os == "linux")
        .unwrap_or(false);
    let force_poll = std::env::var_os("CARGO_FEATURE_POLL").is_some();
    let runtime_fallback = std::env::var_os("CARGO_FEATURE_RUNTIME_FALLBACK").is_some();
    if linux && !force_poll {
        println!("cargo:rustc-cfg=nexio_uring");
        if runtime_fallback {
            println!("cargo:rustc-cfg=nexio_runtime_fallback");
        }
    } else {
        println!("cargo:rustc-cfg=nexio_poll");
    }
}