| 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)?)) |
| } |
| } |