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#![cfg_attr(asm, feature(asm))]

/// Precision is a simple crate to perform measurements using hardware counters.
///
/// It is especially useful for performing micro-benchmarks.
///
/// Example
/// ```rust
/// extern crate precision;
///
/// let p = precision::Precision::new(precision::Config::default()).unwrap();
///
/// let start = p.now();
///
/// let stop = p.now();
/// let elapsed1 = stop - start;
///
/// let start = p.now();
/// let stop = p.now();
/// let elapsed2 = stop - start;
///
/// let elapsed_total = elapsed1 + elapsed2;
/// let elapsed_total_secs = elapsed_total.as_secs_f64(&p);
/// let hw_ticks = elapsed_total.ticks();
/// ```
extern crate libc;

mod config;
mod cpucounter;
mod precision;
mod timestamp;

pub use self::config::*;
pub use self::precision::*;
pub use self::timestamp::*;

#[test]
fn test_simple() {
    use std::thread;
    use std::time::Duration;

    let p = Precision::new(Config::default()).unwrap();
    let start = p.now();
    thread::sleep(Duration::from_secs(2));
    let stop = p.now();
    let elapsed = stop - start;
    assert!(elapsed.as_secs_f64(&p) > 1.0 && elapsed.as_secs_f64(&p) < 4.0);

    let start = p.now();
    let stop = p.now();
    let elapsed = stop - start;
    assert_eq!(elapsed.as_secs(&p), 0);
    assert!(elapsed.ticks() > 0);
}