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#![unstable(feature = "wake_trait", issue = "69912")]
use core::mem::ManuallyDrop;
use core::task::{RawWaker, RawWakerVTable, Waker};
use crate::sync::Arc;
#[unstable(feature = "wake_trait", issue = "69912")]
pub trait Wake {
#[unstable(feature = "wake_trait", issue = "69912")]
fn wake(self: Arc<Self>);
#[unstable(feature = "wake_trait", issue = "69912")]
fn wake_by_ref(self: &Arc<Self>) {
self.clone().wake();
}
}
#[allow(rustc::ineffective_unstable_trait_impl)]
#[unstable(feature = "wake_trait", issue = "69912")]
impl<W: Wake + Send + Sync + 'static> From<Arc<W>> for Waker {
fn from(waker: Arc<W>) -> Waker {
unsafe { Waker::from_raw(raw_waker(waker)) }
}
}
#[allow(rustc::ineffective_unstable_trait_impl)]
#[unstable(feature = "wake_trait", issue = "69912")]
impl<W: Wake + Send + Sync + 'static> From<Arc<W>> for RawWaker {
fn from(waker: Arc<W>) -> RawWaker {
raw_waker(waker)
}
}
#[inline(always)]
fn raw_waker<W: Wake + Send + Sync + 'static>(waker: Arc<W>) -> RawWaker {
unsafe fn clone_waker<W: Wake + Send + Sync + 'static>(waker: *const ()) -> RawWaker {
unsafe { Arc::incr_strong_count(waker as *const W) };
RawWaker::new(
waker as *const (),
&RawWakerVTable::new(clone_waker::<W>, wake::<W>, wake_by_ref::<W>, drop_waker::<W>),
)
}
unsafe fn wake<W: Wake + Send + Sync + 'static>(waker: *const ()) {
let waker = unsafe { Arc::from_raw(waker as *const W) };
<W as Wake>::wake(waker);
}
unsafe fn wake_by_ref<W: Wake + Send + Sync + 'static>(waker: *const ()) {
let waker = unsafe { ManuallyDrop::new(Arc::from_raw(waker as *const W)) };
<W as Wake>::wake_by_ref(&waker);
}
unsafe fn drop_waker<W: Wake + Send + Sync + 'static>(waker: *const ()) {
unsafe { Arc::decr_strong_count(waker as *const W) };
}
RawWaker::new(
Arc::into_raw(waker) as *const (),
&RawWakerVTable::new(clone_waker::<W>, wake::<W>, wake_by_ref::<W>, drop_waker::<W>),
)
}