Crate embassy_executor

embassy-executor

An async/await executor designed for embedded usage.

• No alloc, no heap needed. Task futures are statically allocated.
• No “fixed capacity” data structures, executor works with 1 or 1000 tasks without needing config/tuning.
• Integrated timer queue: sleeping is easy, just do Timer::after(Duration::from_secs(1)).await;.
• No busy-loop polling: CPU sleeps when there’s no work to do, using interrupts or WFE/SEV.
• Efficient polling: a wake will only poll the woken task, not all of them.
• Fair: a task can’t monopolize CPU time even if it’s constantly being woken. All other tasks get a chance to run before a given task gets polled for the second time.
• Creating multiple executor instances is supported, to run tasks with multiple priority levels. This allows higher-priority tasks to preempt lower-priority tasks.

Modules

raw

Raw executor.

Structs

Executor

Single-threaded std-based executor.

SendSpawner

Handle to spawn tasks into an executor from any thread.

SpawnToken

Token to spawn a newly-created task in an executor.

Spawner

Handle to spawn tasks into an executor.

Enums

SpawnError

Error returned when spawning a task.

Attribute Macros

main

Creates a new executor instance and declares an application entry point for STD spawning the corresponding function body as an async task.

task

Declares an async task that can be run by embassy-executor. The optional pool_size parameter can be used to specify how many concurrent tasks can be spawned (default is 1) for the function.