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// edition:2018
use std::sync::Arc;
use std::task::{
Waker, RawWaker, RawWakerVTable,
};
macro_rules! waker_vtable {
($ty:ident) => {
&RawWakerVTable::new(
clone_arc_raw::<$ty>,
wake_arc_raw::<$ty>,
wake_by_ref_arc_raw::<$ty>,
drop_arc_raw::<$ty>,
)
};
}
pub trait ArcWake {
fn wake(self: Arc<Self>);
fn wake_by_ref(arc_self: &Arc<Self>) {
arc_self.clone().wake()
}
fn into_waker(wake: Arc<Self>) -> Waker where Self: Sized
{
let ptr = Arc::into_raw(wake) as *const ();
unsafe {
Waker::from_raw(RawWaker::new(ptr, waker_vtable!(Self)))
}
}
}
unsafe fn increase_refcount<T: ArcWake>(data: *const ()) {
// Retain Arc by creating a copy
let arc: Arc<T> = Arc::from_raw(data as *const T);
let arc_clone = arc.clone();
// Forget the Arcs again, so that the refcount isn't decrased
let _ = Arc::into_raw(arc);
let _ = Arc::into_raw(arc_clone);
}
unsafe fn clone_arc_raw<T: ArcWake>(data: *const ()) -> RawWaker {
increase_refcount::<T>(data);
RawWaker::new(data, waker_vtable!(T))
}
unsafe fn drop_arc_raw<T: ArcWake>(data: *const ()) {
// Drop Arc
let _: Arc<T> = Arc::from_raw(data as *const T);
}
unsafe fn wake_arc_raw<T: ArcWake>(data: *const ()) {
let arc: Arc<T> = Arc::from_raw(data as *const T);
ArcWake::wake(arc);
}
unsafe fn wake_by_ref_arc_raw<T: ArcWake>(data: *const ()) {
let arc: Arc<T> = Arc::from_raw(data as *const T);
ArcWake::wake_by_ref(&arc);
let _ = Arc::into_raw(arc);
}
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