Struct edge_executor::Executor

pub struct Executor<'a, const C: usize, M, S = Local> { /* private fields */ }

Executor is an async executor that is useful specfically for embedded environments.

The implementation is in fact a thin wrapper around smol’s async-task crate.

Highlights:

• no_std (but does need alloc; for a no_std and “no_alloc” executor, look at Embassy, which statically pre-allocates all tasks); (note also that usage of alloc is very limited - only when a new task is being spawn, as well as the executor itself);
• Does not assume an RTOS and can run completely bare-metal (or on top of an RTOS);
• Pluggable Monitor mechanism which makes it ISR-friendly. In particular:
  • Tasks can be woken up (and thus re-scheduled) from within an ISR;
  • The executor itself can run not just in the main “thread”, but from within an ISR as well; the latter is important for bare-metal non-RTOS use-cases, as it allows - by running multiple executors - one in the main “thread” and the others - on ISR interrupts - to achieve RTOS-like pre-emptive execution by scheduling higher-priority tasks in executors that run on (higher-level) ISRs and thus pre-empt the executors scheduled on lower-level ISR and the “main thread” one; note that deploying an executor in an ISR requires the allocator to be usable from an ISR (i.e. allocation/deallocation routines should be protected by critical sections that disable/enable interrupts);
  • Out of the box implementation for Monitor based on condvar, compatible with Rust STD (for cases where notifying from / running in ISRs is not important).
  • Out of the box implementation for Monitor based on WASM event loop, compatible with WASM

Implementations

impl<'a, const C: usize, M, S> Executor<'a, C, M, S>where M: Monitor,

pub fn new() -> Selfwhere M: Default,

pub fn wrap(monitor: M) -> Self

pub fn spawn_detached<F, T>(&self, fut: F) -> Result<&Self, SpawnError>where F: Future<Output = T> + Send + 'a, T: 'a,

pub fn spawn_collect<F, T>( &self, fut: F, collector: &mut Vec<Task<T>, C> ) -> Result<&Self, SpawnError>where F: Future<Output = T> + Send + 'a, T: 'a,

pub fn spawn<F, T>(&self, fut: F) -> Result<Task<T>, SpawnError>where F: Future<Output = T> + Send + 'a, T: 'a,

pub unsafe fn spawn_unchecked<F, T>( &self, fut: F ) -> Result<Task<T>, SpawnError>where F: Future<Output = T>,

pub fn poll_one(&self) -> Poll<()>

pub fn poll<B>(&self, condition: B) -> Poll<()>where B: Fn() -> bool,

pub fn drop_tasks<T>(&self, tasks: T)

pub fn start<B, F>(&'static self, condition: B, finished: F)where M: Start, B: Fn() -> bool + 'static, F: FnOnce() + 'static,

pub fn run<B>(&self, condition: B)where M: Wait, B: Fn() -> bool,

pub fn run_tasks<B, T>(&self, condition: B, tasks: T)where M: Wait, B: Fn() -> bool,

pub fn wait(&self)where M: Wait,

impl<'a, const C: usize, M> Executor<'a, C, M, Local>where M: Monitor,

pub fn spawn_local_detached<F, T>(&self, fut: F) -> Result<&Self, SpawnError>where F: Future<Output = T> + 'a, T: 'a,

pub fn spawn_local_collect<F, T>( &self, fut: F, collector: &mut Vec<Task<T>, C> ) -> Result<&Self, SpawnError>where F: Future<Output = T> + 'a, T: 'a,

pub fn spawn_local<F, T>(&self, fut: F) -> Result<Task<T>, SpawnError>where F: Future<Output = T> + 'a, T: 'a,

Trait Implementations

impl<'a, const C: usize, M, S> Default for Executor<'a, C, M, S>where M: Monitor + Default,

fn default() -> Self

Returns the “default value” for a type.