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46 lines
1.1 KiB
Rust
46 lines
1.1 KiB
Rust
// SPDX-License-Identifier: MPL-2.0
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use core::{
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sync::atomic::{AtomicU64, Ordering},
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time::Duration,
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};
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use super::TIMER_FREQ;
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/// Jiffies is a term used to denote the units of time measurement by the kernel.
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///
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/// A jiffy represents one tick of the system timer interrupt,
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/// whose frequency is equal to [`TIMER_FREQ`] Hz.
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#[derive(Copy, Clone, Debug)]
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pub struct Jiffies(u64);
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pub(super) static ELAPSED: AtomicU64 = AtomicU64::new(0);
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impl Jiffies {
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/// Creates a new instance.
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pub fn new(value: u64) -> Self {
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Self(value)
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}
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/// Returns the elapsed time since the system boots up.
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pub fn elapsed() -> Self {
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Self::new(ELAPSED.load(Ordering::Relaxed))
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}
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/// Gets the number of jiffies.
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pub fn as_u64(self) -> u64 {
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self.0
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}
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/// Gets the [`Duration`] calculated from the jiffies counts.
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pub fn as_duration(self) -> Duration {
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Duration::from_millis(self.0 * 1000 / TIMER_FREQ)
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}
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}
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impl From<Jiffies> for Duration {
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fn from(value: Jiffies) -> Self {
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value.as_duration()
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}
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}
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