Crate kozan_scheduler 

kozan-scheduler — Task scheduler and async executor for Kozan.

Like Chrome’s base/task/ + blink/platform/scheduler/. Standalone crate — zero dependency on kozan-core.

Architecture

Scheduler (MainThreadScheduler — the event loop)
├── TaskQueueManager (SequenceManager — priority picker)
│   └── TaskQueue × 6 (one per priority level)
├── MicrotaskQueue (drain after each macrotask)
├── LocalExecutor (!Send async runtime)
├── FrameScheduler (vsync-driven frame timing)
└── WakeReceiver (cross-thread task delivery)

Event loop algorithm (HTML spec)

loop {
    1. Receive cross-thread tasks
    2. Promote delayed tasks
    3. Poll async executor
    4. Pick ONE macrotask → run
    5. Drain ALL microtasks
    6. If frame due → callbacks → style → layout → paint
    7. Park until next event
}

Re-exports

pub use executor::LocalExecutor;

pub use executor::TaskId;

pub use frame::FrameInfo;

pub use frame::FrameScheduler;

pub use microtask::Microtask;

pub use microtask::MicrotaskQueue;

pub use queue::TaskQueue;

pub use queue::TaskQueueManager;

pub use scheduler::Scheduler;

pub use scheduler::TickResult;

pub use task::Task;

pub use task::TaskPriority;

pub use waker::CrossThreadTask;

pub use waker::SendError;

pub use waker::WakeReceiver;

pub use waker::WakeSender;

pub use waker::cross_thread_channel;

Modules

executor

Local executor — single-threaded !Send async runtime.

frame

Frame scheduler — Chrome’s CCScheduler for vsync-driven rendering.

microtask

Microtask queue — HTML spec “perform a microtask checkpoint”.

queue

Task queues — Chrome’s base::sequence_manager::TaskQueue + SequenceManager.

scheduler

Scheduler — Chrome’s MainThreadScheduler, the event loop.

task

Task types — Chrome’s base::OnceClosure + base::TaskTraits.

timer

Timer registry — drives async sleep / deadline futures on the view thread.

waker

Cross-thread waker — wakes the window thread from background threads.

Structs

FrameTiming

Pipeline timing breakdown for a single frame (milliseconds).