Struct Timestamp 

pub struct Timestamp(/* private fields */);

A point on the monotonic timeline, in nanoseconds since an unspecified epoch (CLOCK_MONOTONIC, i.e. system boot on Linux).

Only intervals are meaningful; the absolute value carries no wall-clock meaning and must never be formatted as a date. The counter is monotonic and does not jump when the wall clock is stepped by NTP or by the user.

A u64 nanosecond counter covers roughly 584 years of uptime, so overflow is not a practical concern — but arithmetic here saturates rather than wrapping, because a clock that silently runs backwards would turn a pacing bug into a torn frame.

Implementations

impl Timestamp

pub const ZERO: Self

The zero point of the monotonic timeline. Useful as a “never” sentinel and as the starting value for a ManualClock.

pub const fn from_nanos(nanos: u64) -> Self

Build a timestamp from a raw CLOCK_MONOTONIC nanosecond count — for example one the kernel reported with a page-flip event.

pub const fn from_timespec(secs: i64, nanos: i64) -> Self

Build a timestamp from a CLOCK_MONOTONIC timespec pair, the shape DRM event structs and libinput report.

Negative components clamp to zero: CLOCK_MONOTONIC never yields them, and clamping keeps a malformed event from producing a timestamp that sorts before Timestamp::ZERO.

pub const fn from_timeval(secs: i64, micros: i64) -> Self

Build a timestamp from a CLOCK_MONOTONIC timeval pair (microsecond resolution), the shape drmEventVBlank reports.

pub const fn as_nanos(self) -> u64

The raw nanosecond count.

pub const fn saturating_duration_since(self, earlier: Self) -> Duration

Interval from earlier to self, saturating at zero if earlier is in fact later.

Saturating is the right failure mode for a display pipeline: a negative interval would otherwise wrap to ~584 years and stall pacing until reboot.

use core::time::Duration;
use drmkit_time::Timestamp;

let t0 = Timestamp::from_nanos(1_000);
let t1 = Timestamp::from_nanos(17_667_000);
assert_eq!(t1.saturating_duration_since(t0), Duration::from_nanos(17_666_000));
assert_eq!(t0.saturating_duration_since(t1), Duration::ZERO);

pub const fn checked_duration_since(self, earlier: Self) -> Option<Duration>

Interval from earlier to self, or None if earlier is later.

Use this where going backwards indicates a bug worth surfacing rather than absorbing.

Trait Implementations

impl Add<Duration> for Timestamp

type Output = Timestamp

The resulting type after applying the + operator.

fn add(self, rhs: Duration) -> Self

Performs the + operation.

impl AddAssign<Duration> for Timestamp

fn add_assign(&mut self, rhs: Duration)

Performs the += operation.

impl Clone for Timestamp

fn clone(&self) -> Self

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Copy for Timestamp

impl Debug for Timestamp

fn fmt(&self, f: &mut Formatter<'_>) -> Result

Formats the value using the given formatter.

impl Default for Timestamp

fn default() -> Self

Returns the “default value” for a type.

impl Display for Timestamp

fn fmt(&self, f: &mut Formatter<'_>) -> Result

Renders as seconds with nanosecond precision — readable in a trace without implying a wall-clock date.

impl Eq for Timestamp

impl Hash for Timestamp

fn hash<__H: Hasher>(&self, state: &mut __H)

Feeds this value into the given Hasher.

fn hash_slice<H>(data: &[Self], state: &mut H)

where H: Hasher, Self: Sized,

Feeds a slice of this type into the given Hasher.

impl Ord for Timestamp

fn cmp(&self, other: &Self) -> Ordering

This method returns an Ordering between self and other.

fn max(self, other: Self) -> Self

where Self: Sized,

Compares and returns the maximum of two values.

fn min(self, other: Self) -> Self

where Self: Sized,

Compares and returns the minimum of two values.

fn clamp(self, min: Self, max: Self) -> Self

where Self: Sized,

Restrict a value to a certain interval.

fn clamp_to<R>(self, range: R) -> Self

where Self: Sized, R: ClampBounds<Self>,

🔬This is a nightly-only experimental API. (clamp_to)

Restrict a value to a certain range.

impl PartialEq for Timestamp

fn eq(&self, other: &Self) -> bool

Equality operator ==.

fn ne(&self, other: &Rhs) -> bool

Inequality operator !=.

impl PartialOrd for Timestamp

fn partial_cmp(&self, other: &Self) -> Option<Ordering>

This method returns an ordering between self and other values if one exists.

fn lt(&self, other: &Rhs) -> bool

Tests less than (for self and other) and is used by the < operator.

fn le(&self, other: &Rhs) -> bool

Tests less than or equal to (for self and other) and is used by the <= operator.

fn gt(&self, other: &Rhs) -> bool

Tests greater than (for self and other) and is used by the > operator.

fn ge(&self, other: &Rhs) -> bool

Tests greater than or equal to (for self and other) and is used by the >= operator.

impl StructuralPartialEq for Timestamp

impl Sub for Timestamp

fn sub(self, rhs: Self) -> Duration

Equivalent to Timestamp::saturating_duration_since.

type Output = Duration

The resulting type after applying the - operator.

impl Sub<Duration> for Timestamp

type Output = Timestamp

The resulting type after applying the - operator.

fn sub(self, rhs: Duration) -> Self

Performs the - operation.

impl SubAssign<Duration> for Timestamp

fn sub_assign(&mut self, rhs: Duration)

Performs the -= operation.