core.time — Time

Import with << core.time. See the corelib index and examples/sleep.qn.

The @sleep leaf IO primitive (a pause) and the monotonic now() clock.

Function	Effect
@sleep(seconds :: Num) -> $	Pause the current fiber for seconds (a fractional Num); execution then continues in program order. Effect-only, so nothing defers or forces. A leaf IO primitive (the @ marker).
now() -> Num	Read a monotonic clock (seconds, fractional Num). Only differences between readings are meaningful, so it measures elapsed time. A plain (non-@) primitive: instant, never parks.

now is an overload set — defining it with another signature adds a member rather than shadowing the clock.

<< core.time

^ = () -> Num => <
  start = now()
  @sleep(0.05)            ~ pause ~50ms, then continue
  now() - start >= 0.05 ? 6 * 7 : 0   ~ the sleep really waited → 42
>

Only the leaf @sleep is marked — ^ and any helper it calls carry nothing. See the Concurrency model and examples/sleep.qn.