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This commit is contained in:
Federico Pasqua
2024-12-24 17:44:19 +01:00
parent 4c3f3ba5bc
commit debad560fa
8 changed files with 293 additions and 0 deletions
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1
executortest/.gitignore vendored Normal file
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/target

8
executortest/.idea/.gitignore generated vendored Normal file
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# Default ignored files
/shelf/
/workspace.xml
# Editor-based HTTP Client requests
/httpRequests/
# Datasource local storage ignored files
/dataSources/
/dataSources.local.xml

11
executortest/.idea/executortest.iml generated Normal file
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<?xml version="1.0" encoding="UTF-8"?>
<module type="EMPTY_MODULE" version="4">
<component name="NewModuleRootManager">
<content url="file://$MODULE_DIR$">
<sourceFolder url="file://$MODULE_DIR$/src" isTestSource="false" />
<excludeFolder url="file://$MODULE_DIR$/target" />
</content>
<orderEntry type="inheritedJdk" />
<orderEntry type="sourceFolder" forTests="false" />
</component>
</module>

8
executortest/.idea/modules.xml generated Normal file
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<?xml version="1.0" encoding="UTF-8"?>
<project version="4">
<component name="ProjectModuleManager">
<modules>
<module fileurl="file://$PROJECT_DIR$/.idea/executortest.iml" filepath="$PROJECT_DIR$/.idea/executortest.iml" />
</modules>
</component>
</project>

6
executortest/.idea/vcs.xml generated Normal file
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<?xml version="1.0" encoding="UTF-8"?>
<project version="4">
<component name="VcsDirectoryMappings">
<mapping directory="$PROJECT_DIR$/.." vcs="Git" />
</component>
</project>

167
executortest/Cargo.lock generated Normal file
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# This file is automatically @generated by Cargo.
# It is not intended for manual editing.
version = 4
[[package]]
name = "autocfg"
version = "1.4.0"
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7
executortest/Cargo.toml Normal file
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[package]
name = "executortest"
version = "0.1.0"
edition = "2021"
[dependencies]
futures = "0.3.31"

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executortest/src/main.rs Normal file
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use std::{
future::Future,
pin::Pin,
sync::{Arc, Mutex},
task::{Context, Poll, Waker},
thread,
time::Duration,
sync::mpsc::{sync_channel, Receiver, SyncSender},
};
use futures::{
future::{BoxFuture, FutureExt},
task::{waker_ref, ArcWake},
};
pub struct TimerFuture {
shared_state: Arc<Mutex<SharedState>>,
}
/// Shared state between the future and the waiting thread
struct SharedState {
/// If the sleep time has elapsed
completed: bool,
/// The waker for the task that `TimerFuture` is running on.
/// The thread can use this after setting `completed = true` to tell
/// `TimerFuture`'s task to wake up, see that `completed = true`, and
/// move forward.
waker: Option<Waker>,
}
impl Future for TimerFuture {
type Output = ();
fn poll(self: Pin<&mut Self>, cx: &mut Context<'_>) -> Poll<Self::Output> {
// Look at the shared state to see if the timer has already completed.
let mut shared_state = self.shared_state.lock().unwrap();
if shared_state.completed {
Poll::Ready(())
} else {
// Set waker so that the thread can wake up the current task
// when the timer has completed, ensuring that the future is polled
// again and sees that `completed = true`.
//
// It's tempting to do this once rather than repeatedly cloning
// the waker each time. However, the `TimerFuture` can move between
// tasks on the executor, which could cause a stale waker pointing
// to the wrong task, preventing `TimerFuture` from waking up
// correctly.
//
// N.B. it's possible to check for this using the `Waker::will_wake`
// function, but we omit that here to keep things simple.
shared_state.waker = Some(cx.waker().clone());
Poll::Pending
}
}
}
impl TimerFuture {
/// Create a new `TimerFuture` which will complete after the provided
/// timeout.
pub fn new(duration: Duration) -> Self {
let shared_state = Arc::new(Mutex::new(SharedState {
completed: false,
waker: None,
}));
// Spawn the new thread
let thread_shared_state = shared_state.clone();
thread::spawn(move || {
thread::sleep(duration);
let mut shared_state = thread_shared_state.lock().unwrap();
// Signal that the timer has completed and wake up the last
// task on which the future was polled, if one exists.
shared_state.completed = true;
if let Some(waker) = shared_state.waker.take() {
waker.wake()
}
});
TimerFuture { shared_state }
}
}
fn main() {
println!("Hello, world!");
}