rust-async-internals

The Rust Future trait uses a poll model where async tasks are driven by executors calling poll, returning Pending or Ready. This Skill explains the core execution mechanism and how wakers notify executors when a task can make progress.

Pin guarantees that self-referential types in Rust async contexts cannot be moved in memory, ensuring memory safety. Unpin indicates a type is safe to move, and this Skill clarifies how both interact with the async state machine.

You can debug a Tokio deadlock by inspecting task dependencies and wakeups using tokio-console. This Skill details how to use the runtime inspection tool to identify waker leaks and resolve task scheduling issues.

Tokio task scheduling mechanisms manage async execution by multiplexing tasks onto worker threads and handling wakeups. This Skill details how tasks are queued, polled, and executed efficiently within the runtime.

The select! macro races concurrent async tasks and returns the first to complete, while join! polls all tasks to completion simultaneously. This Skill explains their internal behavior and differences in task management.

An async task stalls when a waker leak occurs or the poll model fails to schedule a wakeup correctly. This Skill helps identify waker leaks and inspect task dependencies using tokio-console to resolve the stall.