c48cdfe8ee
`Waker::noop()` now returns a `&'static Waker` reference, so it can be passed directly to `Context` creation with no temporary lifetime issue.
35 lines
767 B
Rust
35 lines
767 B
Rust
#![feature(coverage_attribute)]
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#![feature(noop_waker)]
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// edition: 2021
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fn main() {
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for i in 0..16 {
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let future = async {
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if i >= 12 {
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println!("big");
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} else {
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println!("small");
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}
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};
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executor::block_on(future);
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}
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}
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mod executor {
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use core::future::Future;
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use core::pin::pin;
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use core::task::{Context, Poll, Waker};
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#[coverage(off)]
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pub fn block_on<F: Future>(mut future: F) -> F::Output {
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let mut future = pin!(future);
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let mut context = Context::from_waker(Waker::noop());
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loop {
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if let Poll::Ready(val) = future.as_mut().poll(&mut context) {
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break val;
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}
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}
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}
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}
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