3 // revisions: default nomiropt
4 //[nomiropt]compile-flags: -Z mir-opt-level=0
9 // aux-build:arc_wake.rs
11 extern crate arc_wake;
14 use std::future::Future;
17 atomic::{self, AtomicUsize},
19 use std::task::{Context, Poll};
20 use arc_wake::ArcWake;
26 impl ArcWake for Counter {
27 fn wake(self: Arc<Self>) {
28 Self::wake_by_ref(&self)
30 fn wake_by_ref(arc_self: &Arc<Self>) {
31 arc_self.wakes.fetch_add(1, atomic::Ordering::SeqCst);
35 struct WakeOnceThenComplete(bool);
37 fn wake_and_yield_once() -> WakeOnceThenComplete { WakeOnceThenComplete(false) }
39 impl Future for WakeOnceThenComplete {
41 fn poll(mut self: Pin<&mut Self>, cx: &mut Context<'_>) -> Poll<()> {
45 cx.waker().wake_by_ref();
52 fn async_block(x: u8) -> impl Future<Output = u8> {
54 wake_and_yield_once().await;
59 fn async_block_with_borrow_named_lifetime<'a>(x: &'a u8) -> impl Future<Output = u8> + 'a {
61 wake_and_yield_once().await;
66 fn async_nonmove_block(x: u8) -> impl Future<Output = u8> {
69 wake_and_yield_once().await;
76 // see async-closure.rs for async_closure + async_closure_in_unsafe_block
78 async fn async_fn(x: u8) -> u8 {
79 wake_and_yield_once().await;
83 async fn generic_async_fn<T>(x: T) -> T {
84 wake_and_yield_once().await;
88 async fn async_fn_with_borrow(x: &u8) -> u8 {
89 wake_and_yield_once().await;
93 async fn async_fn_with_borrow_named_lifetime<'a>(x: &'a u8) -> u8 {
94 wake_and_yield_once().await;
98 fn async_fn_with_impl_future_named_lifetime<'a>(x: &'a u8) -> impl Future<Output = u8> + 'a {
100 wake_and_yield_once().await;
105 async fn async_fn_multiple_args(x: &u8, _y: &u8) -> u8 {
106 wake_and_yield_once().await;
110 async fn async_fn_multiple_args_named_lifetime<'a>(x: &'a u8, _y: &'a u8) -> u8 {
111 wake_and_yield_once().await;
115 fn async_fn_with_internal_borrow(y: u8) -> impl Future<Output = u8> {
117 async_fn_with_borrow_named_lifetime(&y).await
121 async unsafe fn unsafe_async_fn(x: u8) -> u8 {
122 wake_and_yield_once().await;
126 unsafe fn unsafe_fn(x: u8) -> u8 {
130 fn async_block_in_unsafe_block(x: u8) -> impl Future<Output = u8> {
133 unsafe_fn(unsafe_async_fn(x).await)
145 async fn async_assoc_item(x: u8) -> u8 {
147 unsafe_async_fn(x).await
151 async unsafe fn async_unsafe_assoc_item(x: u8) -> u8 {
152 unsafe_async_fn(x).await
156 fn test_future_yields_once_then_returns<F, Fut>(f: F)
158 F: FnOnce(u8) -> Fut,
159 Fut: Future<Output = u8>,
161 let mut fut = Box::pin(f(9));
162 let counter = Arc::new(Counter { wakes: AtomicUsize::new(0) });
163 let waker = ArcWake::into_waker(counter.clone());
164 let mut cx = Context::from_waker(&waker);
165 assert_eq!(0, counter.wakes.load(atomic::Ordering::SeqCst));
166 assert_eq!(Poll::Pending, fut.as_mut().poll(&mut cx));
167 assert_eq!(1, counter.wakes.load(atomic::Ordering::SeqCst));
168 assert_eq!(Poll::Ready(9), fut.as_mut().poll(&mut cx));
173 ($($fn_name:expr,)*) => { $(
174 test_future_yields_once_then_returns($fn_name);
178 macro_rules! test_with_borrow {
179 ($($fn_name:expr,)*) => { $(
180 test_future_yields_once_then_returns(|x| {
193 async_fn_with_internal_borrow,
194 async_block_in_unsafe_block,
195 Foo::async_assoc_item,
198 unsafe { unsafe_async_fn(x).await }
203 unsafe { Foo::async_unsafe_assoc_item(x).await }
208 async_block_with_borrow_named_lifetime,
209 async_fn_with_borrow,
210 async_fn_with_borrow_named_lifetime,
211 async_fn_with_impl_future_named_lifetime,
214 async_fn_multiple_args_named_lifetime(x, x).await