94 lines
2.9 KiB
Rust
94 lines
2.9 KiB
Rust
#[cfg(feature = "executor-interrupt")]
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compile_error!("`executor-interrupt` is not supported with `arch-std`.");
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#[cfg(feature = "executor-thread")]
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pub use thread::*;
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#[cfg(feature = "executor-thread")]
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mod thread {
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use std::marker::PhantomData;
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use std::sync::{Condvar, Mutex};
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pub use embassy_executor_macros::main_std as main;
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use crate::{raw, Spawner};
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#[export_name = "__pender"]
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fn __pender(context: *mut ()) {
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let signaler: &'static Signaler = unsafe { std::mem::transmute(context) };
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signaler.signal()
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}
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/// Single-threaded std-based executor.
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pub struct Executor {
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inner: raw::Executor,
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not_send: PhantomData<*mut ()>,
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signaler: &'static Signaler,
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}
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impl Executor {
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/// Create a new Executor.
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pub fn new() -> Self {
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let signaler = Box::leak(Box::new(Signaler::new()));
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Self {
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inner: raw::Executor::new(signaler as *mut Signaler as *mut ()),
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not_send: PhantomData,
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signaler,
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}
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}
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/// Run the executor.
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///
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/// The `init` closure is called with a [`Spawner`] that spawns tasks on
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/// this executor. Use it to spawn the initial task(s). After `init` returns,
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/// the executor starts running the tasks.
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///
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/// To spawn more tasks later, you may keep copies of the [`Spawner`] (it is `Copy`),
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/// for example by passing it as an argument to the initial tasks.
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///
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/// This function requires `&'static mut self`. This means you have to store the
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/// Executor instance in a place where it'll live forever and grants you mutable
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/// access. There's a few ways to do this:
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///
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/// - a [StaticCell](https://docs.rs/static_cell/latest/static_cell/) (safe)
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/// - a `static mut` (unsafe)
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/// - a local variable in a function you know never returns (like `fn main() -> !`), upgrading its lifetime with `transmute`. (unsafe)
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///
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/// This function never returns.
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pub fn run(&'static mut self, init: impl FnOnce(Spawner)) -> ! {
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init(self.inner.spawner());
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loop {
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unsafe { self.inner.poll() };
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self.signaler.wait()
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}
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}
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}
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struct Signaler {
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mutex: Mutex<bool>,
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condvar: Condvar,
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}
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impl Signaler {
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fn new() -> Self {
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Self {
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mutex: Mutex::new(false),
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condvar: Condvar::new(),
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}
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}
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fn wait(&self) {
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let mut signaled = self.mutex.lock().unwrap();
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while !*signaled {
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signaled = self.condvar.wait(signaled).unwrap();
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}
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*signaled = false;
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}
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fn signal(&self) {
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let mut signaled = self.mutex.lock().unwrap();
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*signaled = true;
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self.condvar.notify_one();
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}
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}
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}
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