Struct StartupSpans 

pub struct StartupSpans<C: Clock = SystemClock> { /* private fields */ }

Named monotonic timestamps from a begin() epoch — a shell records one named span at each startup milestone (see the SPAN_* consts), then calls Self::emit_log once for a single summary line.

Implementations

impl StartupSpans<SystemClock>

pub fn begin() -> Self

Begin a span recorder honoring the process-wide enabled switch, using the real system clock — what every shell constructs.

impl<C: Clock> StartupSpans<C>

pub fn begin_with_enabled(clock: C, is_enabled: bool) -> Self

Test/advanced seam: begin with an explicit clock and enabled flag, bypassing enabled’s cache (see FrameStats::new_enabled’s docs for why).

pub fn record(&mut self, name: &'static str)

Record name at the current clock reading, as a delta from Self::begin’s epoch. A no-op (no clock read, no allocation) when disabled.

pub fn spans(&self) -> &[(&'static str, Duration)]

The recorded (name, delta) pairs in insertion order.

pub fn emit_log(&self)

Emit one frust-perf startup ... line via log::info! containing every recorded span’s name and millisecond delta, in insertion order. A no-op when disabled or when nothing has been recorded.