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    // Copyright 2012-2013 The Rust Project Developers. See the COPYRIGHT
    // file at the top-level directory of this distribution and at
    // http://rust-lang.org/COPYRIGHT.
    //
    // Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
    // http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
    // <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
    // option. This file may not be copied, modified, or distributed
    // except according to those terms.

    use std::time;

    fn duration_since_epoch() -> time::Duration {
        return match time::SystemTime::now().duration_since(time::UNIX_EPOCH) {
            Ok(dur) => dur,
            Err(err) => err.duration(),
        };
    }

    /**
     * Returns the current value of a high-resolution performance counter
     * in nanoseconds since an unspecified epoch.
     */
    pub fn precise_time_ns() -> u64 {
        let dur = duration_since_epoch();
        return dur.as_secs() * 1000_000_000 + dur.subsec_nanos() as u64;
    }

    /**
     * Returns the current value of a high-resolution performance counter
     * in seconds since an unspecified epoch.
     */
    pub fn precise_time_s() -> f64 {
        let dur = duration_since_epoch();
        return dur.as_secs() as f64 + (dur.subsec_nanos() as f64 / 1000_000_000.);
    }

    /**
     * Returns the current value of a high-resolution performance counter
     * in milliseconds since an unspecified epoch.
     */
    pub fn precise_time_ms() -> u64 {
        let dur = duration_since_epoch();
        return dur.as_secs() * 1000 + (dur.subsec_nanos() / 1000_000) as u64;
    }

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