third_party/rust/mio-extras/src/lib.rs


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//! Extra components for use with Mio.
#![deny(missing_docs)]
extern crate lazycell;
extern crate mio;
extern crate slab;

#[macro_use]
extern crate log;

pub mod channel;
pub mod timer;

// Conversion utilities
mod convert {
    use std::time::Duration;

    const NANOS_PER_MILLI: u32 = 1_000_000;
    const MILLIS_PER_SEC: u64 = 1_000;

    /// Convert a `Duration` to milliseconds, rounding up and saturating at
    /// `u64::MAX`.
    ///
    /// The saturating is fine because `u64::MAX` milliseconds are still many
    /// million years.
    pub fn millis(duration: Duration) -> u64 {
        // Round up.
        let millis = (duration.subsec_nanos() + NANOS_PER_MILLI - 1) / NANOS_PER_MILLI;
        duration
            .as_secs()
            .saturating_mul(MILLIS_PER_SEC)
            .saturating_add(u64::from(millis))
    }
}