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use crate::time::Duration;
use crate::mem;
use crate::sys::cvt_wasi;
use libc;
#[derive(Copy, Clone, PartialEq, Eq, PartialOrd, Ord, Debug, Hash)]
pub struct Instant(Duration);
#[derive(Copy, Clone, PartialEq, Eq, PartialOrd, Ord, Debug, Hash)]
pub struct SystemTime(Duration);
pub const UNIX_EPOCH: SystemTime = SystemTime(Duration::from_secs(0));
fn current_time(clock: u32) -> Duration {
unsafe {
let mut ts = mem::zeroed();
cvt_wasi(libc::__wasi_clock_time_get(
clock,
1, // precision... seems ignored though?
&mut ts,
)).unwrap();
Duration::new(
(ts / 1_000_000_000) as u64,
(ts % 1_000_000_000) as u32,
)
}
}
impl Instant {
pub fn now() -> Instant {
Instant(current_time(libc::__WASI_CLOCK_MONOTONIC))
}
pub const fn zero() -> Instant {
Instant(Duration::from_secs(0))
}
pub fn actually_monotonic() -> bool {
true
}
pub fn checked_sub_instant(&self, other: &Instant) -> Option<Duration> {
self.0.checked_sub(other.0)
}
pub fn checked_add_duration(&self, other: &Duration) -> Option<Instant> {
Some(Instant(self.0.checked_add(*other)?))
}
pub fn checked_sub_duration(&self, other: &Duration) -> Option<Instant> {
Some(Instant(self.0.checked_sub(*other)?))
}
}
impl SystemTime {
pub fn now() -> SystemTime {
SystemTime(current_time(libc::__WASI_CLOCK_REALTIME))
}
pub fn from_wasi_timestamp(ts: libc::__wasi_timestamp_t) -> SystemTime {
SystemTime(Duration::from_nanos(ts))
}
pub fn sub_time(&self, other: &SystemTime)
-> Result<Duration, Duration> {
self.0.checked_sub(other.0).ok_or_else(|| other.0 - self.0)
}
pub fn checked_add_duration(&self, other: &Duration) -> Option<SystemTime> {
Some(SystemTime(self.0.checked_add(*other)?))
}
pub fn checked_sub_duration(&self, other: &Duration) -> Option<SystemTime> {
Some(SystemTime(self.0.checked_sub(*other)?))
}
}
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