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use {
crate::unchecked_div_by_const,
std::{
sync::atomic::{AtomicU64, Ordering},
time::{Duration, SystemTime, UNIX_EPOCH},
},
};
pub fn duration_as_ns(d: &Duration) -> u64 {
d.as_secs()
.saturating_mul(1_000_000_000)
.saturating_add(u64::from(d.subsec_nanos()))
}
pub fn duration_as_us(d: &Duration) -> u64 {
d.as_secs()
.saturating_mul(1_000_000)
.saturating_add(unchecked_div_by_const!(u64::from(d.subsec_nanos()), 1_000))
}
pub fn duration_as_ms(d: &Duration) -> u64 {
d.as_secs()
.saturating_mul(1000)
.saturating_add(unchecked_div_by_const!(
u64::from(d.subsec_nanos()),
1_000_000
))
}
pub fn duration_as_s(d: &Duration) -> f32 {
d.as_secs() as f32 + (d.subsec_nanos() as f32 / 1_000_000_000.0)
}
pub fn timestamp() -> u64 {
let now = SystemTime::now()
.duration_since(UNIX_EPOCH)
.expect("create timestamp in timing");
duration_as_ms(&now)
}
pub const SECONDS_PER_YEAR: f64 = 365.242_199 * 24.0 * 60.0 * 60.0;
pub fn years_as_slots(years: f64, tick_duration: &Duration, ticks_per_slot: u64) -> f64 {
years *
SECONDS_PER_YEAR
* (1_000_000_000.0 / duration_as_ns(tick_duration) as f64)
/ ticks_per_slot as f64
}
pub fn slot_duration_from_slots_per_year(slots_per_year: f64) -> Duration {
let slot_in_ns = if slots_per_year != 0.0 {
(SECONDS_PER_YEAR * 1_000_000_000.0) / slots_per_year
} else {
0.0
};
Duration::from_nanos(slot_in_ns as u64)
}
#[derive(Debug, Default)]
pub struct AtomicInterval {
last_update: AtomicU64,
}
impl AtomicInterval {
pub fn should_update(&self, interval_time_ms: u64) -> bool {
self.should_update_ext(interval_time_ms, true)
}
pub fn should_update_ext(&self, interval_time_ms: u64, skip_first: bool) -> bool {
let now = timestamp();
let last = self.last_update.load(Ordering::Relaxed);
now.saturating_sub(last) > interval_time_ms
&& self
.last_update
.compare_exchange(last, now, Ordering::Relaxed, Ordering::Relaxed)
== Ok(last)
&& !(skip_first && last == 0)
}
}
#[cfg(test)]
mod test {
use super::*;
#[test]
fn test_interval_update() {
solana_logger::setup();
let i = AtomicInterval::default();
assert!(!i.should_update(1000));
let i = AtomicInterval::default();
assert!(i.should_update_ext(1000, false));
std::thread::sleep(Duration::from_millis(10));
assert!(i.should_update(9));
assert!(!i.should_update(100));
}
#[test]
#[allow(clippy::float_cmp)]
fn test_years_as_slots() {
let tick_duration = Duration::from_micros(1000 * 1000 / 160);
assert_eq!(years_as_slots(0.0, &tick_duration, 4) as u64, 0);
assert_eq!(
years_as_slots(1.0 / 12f64, &tick_duration, 4) as u64,
105_189_753
);
assert_eq!(years_as_slots(1.0, &tick_duration, 4) as u64, 1_262_277_039);
let tick_duration = Duration::from_micros(1000 * 1000);
assert_eq!(
years_as_slots(1.0 / SECONDS_PER_YEAR, &tick_duration, 1),
1.0
);
}
#[test]
fn test_slot_duration_from_slots_per_year() {
let slots_per_year = 1_262_277_039.0;
let ticks_per_slot = 4;
assert_eq!(
slot_duration_from_slots_per_year(slots_per_year),
Duration::from_micros(1000 * 1000 / 160) * ticks_per_slot
);
assert_eq!(
slot_duration_from_slots_per_year(0.0),
Duration::from_micros(0) * ticks_per_slot
);
let slots_per_year = SECONDS_PER_YEAR;
let ticks_per_slot = 1;
assert_eq!(
slot_duration_from_slots_per_year(slots_per_year),
Duration::from_millis(1000) * ticks_per_slot
);
}
}