Struct Since 

pub struct Since { /* private fields */ }

A moment to measure from, KEPT - what a Deadline cannot be, because it borrows the context it reads the clock through and so cannot outlive the call that made it.

For a wait that is not a loop: something started now and asked about later, from a different call. A radio’s sweep is the first - each channel is listened to for a dwell, and the serve loop asks the radio once per turn whether it is time to tune the next; and the same loop times how long it has gone without reading a joined radio, and how long a request took to serve.

On an uncalibrated machine every budget has passed and nothing has elapsed. There is no duration to compare with, and the alternative - nothing ever passes - turns a dwell into a hang; this way a sweep still runs, only too fast to hear everything. calibrated says which case this is.

Implementations

impl Since

pub fn now(ctx: &ServiceContext) -> Self

Now.

pub fn passed(&self, ctx: &ServiceContext, budget: Budget) -> bool

Has budget passed since this moment?

pub fn elapsed_us(&self, ctx: &ServiceContext) -> u64

Microseconds since this moment; 0 when uncalibrated, where it cannot be known.

pub fn elapsed_ms(&self, ctx: &ServiceContext) -> u64

Milliseconds since this moment; 0 when uncalibrated, where it cannot be known.

pub fn elapsed_ticks(&self, ctx: &ServiceContext) -> u64

Counter ticks since this moment - the unit a benchmark reports in. Counts even when the machine is uncalibrated, because the counter runs whether or not anyone knows its rate.

Trait Implementations

impl Clone for Since

fn clone(&self) -> Since

Returns a duplicate of the value.

fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source.

impl Copy for Since