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// edition:2018 | ||
// aux-build:arc_wake.rs | ||
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#![feature(async_await, await_macro)] | ||
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extern crate arc_wake; | ||
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use std::pin::Pin; | ||
use std::future::Future; | ||
use std::sync::{ | ||
Arc, | ||
atomic::{self, AtomicUsize}, | ||
}; | ||
use std::task::{Context, Poll}; | ||
use arc_wake::ArcWake; | ||
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struct Counter { | ||
wakes: AtomicUsize, | ||
} | ||
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impl ArcWake for Counter { | ||
fn wake(self: Arc<Self>) { | ||
Self::wake_by_ref(&self) | ||
} | ||
fn wake_by_ref(arc_self: &Arc<Self>) { | ||
arc_self.wakes.fetch_add(1, atomic::Ordering::SeqCst); | ||
} | ||
} | ||
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struct WakeOnceThenComplete(bool, u8); | ||
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impl Future for WakeOnceThenComplete { | ||
type Output = u8; | ||
fn poll(mut self: Pin<&mut Self>, cx: &mut Context<'_>) -> Poll<u8> { | ||
if self.0 { | ||
Poll::Ready(self.1) | ||
} else { | ||
cx.waker().wake_by_ref(); | ||
self.0 = true; | ||
Poll::Pending | ||
} | ||
} | ||
} | ||
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fn wait(fut: impl Future<Output = u8>) -> u8 { | ||
let mut fut = Box::pin(fut); | ||
let counter = Arc::new(Counter { wakes: AtomicUsize::new(0) }); | ||
let waker = ArcWake::into_waker(counter.clone()); | ||
let mut cx = Context::from_waker(&waker); | ||
loop { | ||
match fut.as_mut().poll(&mut cx) { | ||
Poll::Ready(out) => return out, | ||
Poll::Pending => (), | ||
} | ||
} | ||
} | ||
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fn base() -> WakeOnceThenComplete { WakeOnceThenComplete(false, 1) } | ||
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async fn await1_level1() -> u8 { | ||
await!(base()) | ||
} | ||
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async fn await2_level1() -> u8 { | ||
await!(base()) + await!(base()) | ||
} | ||
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async fn await3_level1() -> u8 { | ||
await!(base()) + await!(base()) + await!(base()) | ||
} | ||
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async fn await3_level2() -> u8 { | ||
await!(await3_level1()) + await!(await3_level1()) + await!(await3_level1()) | ||
} | ||
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async fn await3_level3() -> u8 { | ||
await!(await3_level2()) + await!(await3_level2()) + await!(await3_level2()) | ||
} | ||
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async fn await3_level4() -> u8 { | ||
await!(await3_level3()) + await!(await3_level3()) + await!(await3_level3()) | ||
} | ||
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async fn await3_level5() -> u8 { | ||
await!(await3_level4()) + await!(await3_level4()) + await!(await3_level4()) | ||
} | ||
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fn main() { | ||
assert_eq!(2, std::mem::size_of_val(&base())); | ||
assert_eq!(8, std::mem::size_of_val(&await1_level1())); | ||
assert_eq!(12, std::mem::size_of_val(&await2_level1())); | ||
assert_eq!(12, std::mem::size_of_val(&await3_level1())); | ||
assert_eq!(20, std::mem::size_of_val(&await3_level2())); | ||
assert_eq!(28, std::mem::size_of_val(&await3_level3())); | ||
assert_eq!(36, std::mem::size_of_val(&await3_level4())); | ||
assert_eq!(44, std::mem::size_of_val(&await3_level5())); | ||
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assert_eq!(1, wait(base())); | ||
assert_eq!(1, wait(await1_level1())); | ||
assert_eq!(2, wait(await2_level1())); | ||
assert_eq!(3, wait(await3_level1())); | ||
assert_eq!(9, wait(await3_level2())); | ||
assert_eq!(27, wait(await3_level3())); | ||
assert_eq!(81, wait(await3_level4())); | ||
assert_eq!(243, wait(await3_level5())); | ||
} |
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#![feature(generators)] | ||
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fn main() { | ||
let a = || { | ||
{ | ||
let w: i32 = 4; | ||
yield; | ||
println!("{:?}", w); | ||
} | ||
{ | ||
let x: i32 = 5; | ||
yield; | ||
println!("{:?}", x); | ||
} | ||
{ | ||
let y: i32 = 6; | ||
yield; | ||
println!("{:?}", y); | ||
} | ||
{ | ||
let z: i32 = 7; | ||
yield; | ||
println!("{:?}", z); | ||
} | ||
}; | ||
assert_eq!(8, std::mem::size_of_val(&a)); | ||
} |