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use crate::sync::AtomicWaker;
use tokio_test::task;
use std::task::Waker;
trait AssertSend: Send {}
trait AssertSync: Send {}
impl AssertSend for AtomicWaker {}
impl AssertSync for AtomicWaker {}
impl AssertSend for Waker {}
impl AssertSync for Waker {}
#[test]
fn basic_usage() {
let mut waker = task::spawn(AtomicWaker::new());
waker.enter(|cx, waker| waker.register_by_ref(cx.waker()));
waker.wake();
assert!(waker.is_woken());
}
#[test]
fn wake_without_register() {
let mut waker = task::spawn(AtomicWaker::new());
waker.wake();
// Registering should not result in a notification
waker.enter(|cx, waker| waker.register_by_ref(cx.waker()));
assert!(!waker.is_woken());
}
#[test]
fn atomic_waker_panic_safe() {
use std::panic;
use std::ptr;
use std::task::{RawWaker, RawWakerVTable, Waker};
static PANICKING_VTABLE: RawWakerVTable = RawWakerVTable::new(
|_| panic!("clone"),
|_| unimplemented!("wake"),
|_| unimplemented!("wake_by_ref"),
|_| (),
);
static NONPANICKING_VTABLE: RawWakerVTable = RawWakerVTable::new(
|_| RawWaker::new(ptr::null(), &NONPANICKING_VTABLE),
|_| unimplemented!("wake"),
|_| unimplemented!("wake_by_ref"),
|_| (),
);
let panicking = unsafe { Waker::from_raw(RawWaker::new(ptr::null(), &PANICKING_VTABLE)) };
let nonpanicking = unsafe { Waker::from_raw(RawWaker::new(ptr::null(), &NONPANICKING_VTABLE)) };
let atomic_waker = AtomicWaker::new();
let panicking = panic::AssertUnwindSafe(&panicking);
let result = panic::catch_unwind(|| {
let panic::AssertUnwindSafe(panicking) = panicking;
atomic_waker.register_by_ref(panicking);
});
assert!(result.is_err());
assert!(atomic_waker.take_waker().is_none());
atomic_waker.register_by_ref(&nonpanicking);
assert!(atomic_waker.take_waker().is_some());
}
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