src/libstd/sys/wasm/time.rs

   1 use crate::time::Duration;
   2 use crate::sys::{TimeSysCall, TimeClock};
   3
   4 #[derive(Copy, Clone, PartialEq, Eq, PartialOrd, Ord, Debug, Hash)]
   5 pub struct Instant(Duration);
   6
   7 #[derive(Copy, Clone, PartialEq, Eq, PartialOrd, Ord, Debug, Hash)]
   8 pub struct SystemTime(Duration);
   9
  10 pub const UNIX_EPOCH: SystemTime = SystemTime(Duration::from_secs(0));
  11
  12 impl Instant {
  13     pub fn now() -> Instant {
  14         Instant(TimeSysCall::perform(TimeClock::Monotonic))
  15     }
  16
  17     pub const fn zero() -> Instant {
  18         Instant(Duration::from_secs(0))
  19     }
  20
  21     pub fn actually_monotonic() -> bool {
  22         false
  23     }
  24
  25     pub fn checked_sub_instant(&self, other: &Instant) -> Option<Duration> {
  26         self.0.checked_sub(other.0)
  27     }
  28
  29     pub fn checked_add_duration(&self, other: &Duration) -> Option<Instant> {
  30         Some(Instant(self.0.checked_add(*other)?))
  31     }
  32
  33     pub fn checked_sub_duration(&self, other: &Duration) -> Option<Instant> {
  34         Some(Instant(self.0.checked_sub(*other)?))
  35     }
  36 }
  37
  38 impl SystemTime {
  39     pub fn now() -> SystemTime {
  40         SystemTime(TimeSysCall::perform(TimeClock::System))
  41     }
  42
  43     pub fn sub_time(&self, other: &SystemTime)
  44                     -> Result<Duration, Duration> {
  45         self.0.checked_sub(other.0).ok_or_else(|| other.0 - self.0)
  46     }
  47
  48     pub fn checked_add_duration(&self, other: &Duration) -> Option<SystemTime> {
  49         Some(SystemTime(self.0.checked_add(*other)?))
  50     }
  51
  52     pub fn checked_sub_duration(&self, other: &Duration) -> Option<SystemTime> {
  53         Some(SystemTime(self.0.checked_sub(*other)?))
  54     }
  55 }