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package wasi:clocks@0.2.4;
/// WASI Monotonic Clock is a clock API intended to let users measure elapsed
/// time.
///
/// It is intended to be portable at least between Unix-family platforms and
/// Windows.
///
/// A monotonic clock is a clock which has an unspecified initial value, and
/// successive reads of the clock will produce non-decreasing values.
@since(version = 0.2.0)
interface monotonic-clock {
@since(version = 0.2.0)
use wasi:io/poll@0.2.4.{pollable};
/// An instant in time, in nanoseconds. An instant is relative to an
/// unspecified initial value, and can only be compared to instances from
/// the same monotonic-clock.
@since(version = 0.2.0)
type instant = u64;
/// A duration of time, in nanoseconds.
@since(version = 0.2.0)
type duration = u64;
/// Read the current value of the clock.
///
/// The clock is monotonic, therefore calling this function repeatedly will
/// produce a sequence of non-decreasing values.
@since(version = 0.2.0)
now: func() -> instant;
/// Query the resolution of the clock. Returns the duration of time
/// corresponding to a clock tick.
@since(version = 0.2.0)
resolution: func() -> duration;
/// Create a `pollable` which will resolve once the specified instant
/// has occurred.
@since(version = 0.2.0)
subscribe-instant: func(
when: instant,
) -> pollable;
/// Create a `pollable` that will resolve after the specified duration has
/// elapsed from the time this function is invoked.
@since(version = 0.2.0)
subscribe-duration: func(
when: duration,
) -> pollable;
}