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#![allow(dead_code)]
use crate::cmp::Ordering;
use crate::sys::hermit::abi;
use crate::sys::hermit::abi::timespec;
use crate::sys::hermit::abi::{CLOCK_MONOTONIC, CLOCK_REALTIME, NSEC_PER_SEC};
use crate::time::Duration;
use core::hash::{Hash, Hasher};
#[derive(Copy, Clone, Debug)]
struct Timespec {
t: timespec,
}
impl Timespec {
const fn zero() -> Timespec {
Timespec { t: timespec { tv_sec: 0, tv_nsec: 0 } }
}
fn sub_timespec(&self, other: &Timespec) -> Result<Duration, Duration> {
if self >= other {
Ok(if self.t.tv_nsec >= other.t.tv_nsec {
Duration::new(
(self.t.tv_sec - other.t.tv_sec) as u64,
(self.t.tv_nsec - other.t.tv_nsec) as u32,
)
} else {
Duration::new(
(self.t.tv_sec - 1 - other.t.tv_sec) as u64,
self.t.tv_nsec as u32 + (NSEC_PER_SEC as u32) - other.t.tv_nsec as u32,
)
})
} else {
match other.sub_timespec(self) {
Ok(d) => Err(d),
Err(d) => Ok(d),
}
}
}
fn checked_add_duration(&self, other: &Duration) -> Option<Timespec> {
let mut secs = other
.as_secs()
.try_into() // <- target type would be `libc::time_t`
.ok()
.and_then(|secs| self.t.tv_sec.checked_add(secs))?;
// Nano calculations can't overflow because nanos are <1B which fit
// in a u32.
let mut nsec = other.subsec_nanos() + self.t.tv_nsec as u32;
if nsec >= NSEC_PER_SEC as u32 {
nsec -= NSEC_PER_SEC as u32;
secs = secs.checked_add(1)?;
}
Some(Timespec { t: timespec { tv_sec: secs, tv_nsec: nsec as _ } })
}
fn checked_sub_duration(&self, other: &Duration) -> Option<Timespec> {
let mut secs = other
.as_secs()
.try_into() // <- target type would be `libc::time_t`
.ok()
.and_then(|secs| self.t.tv_sec.checked_sub(secs))?;
// Similar to above, nanos can't overflow.
let mut nsec = self.t.tv_nsec as i32 - other.subsec_nanos() as i32;
if nsec < 0 {
nsec += NSEC_PER_SEC as i32;
secs = secs.checked_sub(1)?;
}
Some(Timespec { t: timespec { tv_sec: secs, tv_nsec: nsec as _ } })
}
}
impl PartialEq for Timespec {
fn eq(&self, other: &Timespec) -> bool {
self.t.tv_sec == other.t.tv_sec && self.t.tv_nsec == other.t.tv_nsec
}
}
impl Eq for Timespec {}
impl PartialOrd for Timespec {
fn partial_cmp(&self, other: &Timespec) -> Option<Ordering> {
Some(self.cmp(other))
}
}
impl Ord for Timespec {
fn cmp(&self, other: &Timespec) -> Ordering {
let me = (self.t.tv_sec, self.t.tv_nsec);
let other = (other.t.tv_sec, other.t.tv_nsec);
me.cmp(&other)
}
}
impl Hash for Timespec {
fn hash<H: Hasher>(&self, state: &mut H) {
self.t.tv_sec.hash(state);
self.t.tv_nsec.hash(state);
}
}
#[derive(Copy, Clone, PartialEq, Eq, PartialOrd, Ord, Debug, Hash)]
pub struct Instant {
t: Timespec,
}
impl Instant {
pub fn now() -> Instant {
let mut time: Timespec = Timespec::zero();
let _ = unsafe { abi::clock_gettime(CLOCK_MONOTONIC, &mut time.t as *mut timespec) };
Instant { t: time }
}
pub fn checked_sub_instant(&self, other: &Instant) -> Option<Duration> {
self.t.sub_timespec(&other.t).ok()
}
pub fn checked_add_duration(&self, other: &Duration) -> Option<Instant> {
Some(Instant { t: self.t.checked_add_duration(other)? })
}
pub fn checked_sub_duration(&self, other: &Duration) -> Option<Instant> {
Some(Instant { t: self.t.checked_sub_duration(other)? })
}
}
#[derive(Copy, Clone, PartialEq, Eq, PartialOrd, Ord, Hash, Debug)]
pub struct SystemTime {
t: Timespec,
}
pub const UNIX_EPOCH: SystemTime = SystemTime { t: Timespec::zero() };
impl SystemTime {
pub fn now() -> SystemTime {
let mut time: Timespec = Timespec::zero();
let _ = unsafe { abi::clock_gettime(CLOCK_REALTIME, &mut time.t as *mut timespec) };
SystemTime { t: time }
}
pub fn sub_time(&self, other: &SystemTime) -> Result<Duration, Duration> {
self.t.sub_timespec(&other.t)
}
pub fn checked_add_duration(&self, other: &Duration) -> Option<SystemTime> {
Some(SystemTime { t: self.t.checked_add_duration(other)? })
}
pub fn checked_sub_duration(&self, other: &Duration) -> Option<SystemTime> {
Some(SystemTime { t: self.t.checked_sub_duration(other)? })
}
}
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