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/* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
use moz_task;
use std::{
future::Future,
pin::Pin,
sync::atomic::{AtomicBool, Ordering::Relaxed},
sync::Arc,
task::{Context, Poll, Waker},
};
/// Demo `Future` to demonstrate executing futures to completion via `nsIEventTarget`.
struct MyFuture {
poll_count: u32,
waker: Option<Waker>,
}
impl Default for MyFuture {
fn default() -> Self {
Self {
poll_count: 0,
waker: None,
}
}
}
impl Future for MyFuture {
type Output = ();
fn poll(mut self: Pin<&mut Self>, cx: &mut Context<'_>) -> Poll<()> {
self.poll_count += 1;
if let Some(waker) = &mut self.waker {
if !waker.will_wake(cx.waker()) {
*waker = cx.waker().clone();
}
} else {
let waker = cx.waker().clone();
self.waker = Some(waker);
}
println!("Poll count = {}", self.poll_count);
if self.poll_count > 5 {
Poll::Ready(())
} else {
// Just notify the task that we need to re-polled.
if let Some(waker) = &self.waker {
waker.wake_by_ref();
}
Poll::Pending
}
}
}
#[no_mangle]
pub extern "C" fn Rust_Future(it_worked: *mut bool) {
let done = Arc::new(AtomicBool::new(false));
let done2 = done.clone();
moz_task::spawn_current_thread(async move {
MyFuture::default().await;
done.store(true, Relaxed);
})
.unwrap();
unsafe {
moz_task::gtest_only::spin_event_loop_until(move || done2.load(Relaxed)).unwrap();
*it_worked = true;
};
}
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