irid-std 0.3.1

A replacement for std when running without a filesystem on the irid kernel
Documentation 
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use core::time::Duration;

use crate::{fs::File, read_value};

#[derive(Clone, Copy, Debug, PartialEq, Eq, Hash, PartialOrd, Ord)]
pub struct Instant {
    value: u64,
}

impl Instant {
    pub fn now() -> Self {
        let mut timer = File::open("/dev/timer0").expect("failed to open timer file");

        let current: u64 = read_value(&mut timer).expect("failed to read current time");

        Self {
            value: current
        }
    }

    pub fn duration_since(&self, earlier: Instant) -> Duration {
        let diff = self.value.saturating_sub(earlier.value);

        Duration::from_nanos(diff)
    }
    
    pub fn elapsed(&self) -> Duration {
        self.duration_since(Instant::now())
    }
}