Struct SystemClock 

pub struct SystemClock;

The system wall clock.

Trait Implementations

impl Clock for SystemClock

fn sleep_until( &self, at: SystemTime, ) -> Pin<Box<dyn Future<Output = Result<(), WallTimerError>> + Send>>

The system’s own timer for an absolute wall-clock time, which the system moves when its clock is set. A time at or before the epoch has passed: no timer is armed for it, since Linux’s timer can’t hold one.

fn now(&self) -> SystemTime

The wall clock’s current time.

fn elapsed(&self) -> Duration

Monotonic time since an arbitrary origin, counting time the system spent asleep (§16.6). Readings never decrease within a process; only differences between two readings of one clock mean anything.

fn deadline( &self, duration: Duration, ) -> Pin<Box<dyn Future<Output = ()> + Send>>

End once duration of elapsed time has passed: a deadline that work races, such as a sign-in’s wait for its callback or a stalled transfer’s, or an interval, such as the idle time between passes. System clocks use the runtime’s monotonic timer; controlled clocks wake only when their supplied time advances.

fn wait_out(&self, wait: Duration) -> Pin<Box<dyn Future<Output = ()> + Send>>

Wait out wait before trying again: a backoff, a provider’s cooldown, or the spacing between requests the code chose. It passes as a deadline of the same length does; a test’s clock may move its time to the wait’s end as the code arms it, since no work races it.