Struct Scheduler 

pub struct Scheduler { /* private fields */ }

The scheduler manages the work queue and coordinates frame timing.

Implementations

impl Scheduler

pub fn new() -> Self

pub fn set_frame_budget(&mut self, budget: Duration)

Set frame budget (e.g., 8.33ms for 120fps ProMotion displays).

pub fn enqueue(&self, batch: IrBatch, priority: Priority)

Enqueue an IR batch for processing. Called from JS thread via JSI.

pub fn is_processing(&self) -> bool

Check if the engine is currently processing a frame. JS scheduler uses this for backpressure — if true, coalesce more.

pub fn drain_frame(&self) -> Vec<IrBatch>

Drain pending work items for the current frame. Returns batches to process, coalescing multiple Normal/Low priority batches into a single processing round.

Rules:

• Immediate priority: return immediately (one at a time)
• UserBlocking: return all UserBlocking items in queue
• Normal/Low: coalesce up to MAX_COALESCE_COUNT
• Idle: only return if no other priority is pending

pub fn record_frame( &self, layout_duration: Duration, mount_duration: Duration, batches_processed: u32, )

Record frame timing (called by Engine after processing).

pub fn stats(&self) -> FrameStats

Get current frame statistics (for DevTools).

pub fn has_pending_work(&self) -> bool

Check if there’s pending work.