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use std::io::Error;
use std::time::Duration;
#[cfg_attr(target_os = "linux", path = "pthread.rs")]
#[cfg_attr(any(target_os = "macos", target_os = "ios"), path = "mach/mod.rs")]
mod os;
pub use os::cpu_clock_for_current_thread;
#[cfg(target_family = "unix")]
mod unix;
pub trait Clock: Sized + Send {
fn get_time(&self) -> Result<Duration, Error>;
}
#[cfg(test)]
mod tests {
use super::{cpu_clock_for_current_thread, Clock};
#[test]
fn valid_measurement() {
let clock = cpu_clock_for_current_thread().unwrap();
let mut samples = std::iter::repeat::<()>(())
.map(|_| clock.get_time().unwrap())
.step_by(50000);
let mut last_time = samples.next().unwrap();
let samples = samples
.take(5)
.map(|this_time| {
assert!(this_time > last_time);
let diff = (this_time - last_time).as_secs_f64();
last_time = this_time;
diff
})
.collect::<Vec<f64>>();
let avg = samples.iter().sum::<f64>() / (samples.len() as f64);
let mean_abs_dev_scaled = samples
.iter()
.map(|sample| (sample - avg).abs())
.sum::<f64>()
/ (samples.len() as f64)
/ avg;
println!(
"
durations of timing 50000 samples
==================================
{:#?}
----------------------------------
avg: {}, mad scaled: {}",
samples, avg, mean_abs_dev_scaled
);
assert!(mean_abs_dev_scaled < 0.1);
}
}