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Change ArcWake::into_waker to a free function
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Original file line number | Diff line number | Diff line change |
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@@ -0,0 +1,53 @@ | ||
use super::arc_wake::ArcWake; | ||
use core::mem; | ||
use core::task::{Waker, RawWaker, RawWakerVTable}; | ||
use alloc::sync::Arc; | ||
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/// Creates a [`Waker`] from an `Arc<impl ArcWake>`. | ||
/// | ||
/// The returned [`Waker`] will call | ||
/// [`ArcWake.wake()`](ArcWake::wake) if awoken. | ||
pub fn waker<W>(wake: Arc<W>) -> Waker | ||
where | ||
W: ArcWake, | ||
{ | ||
let ptr = Arc::into_raw(wake) as *const (); | ||
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unsafe { | ||
Waker::from_raw(RawWaker::new(ptr, waker_vtable!(W))) | ||
} | ||
} | ||
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// FIXME: panics on Arc::clone / refcount changes could wreak havoc on the | ||
// code here. We should guard against this by aborting. | ||
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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 | ||
mem::forget(arc); | ||
mem::forget(arc_clone); | ||
} | ||
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// used by `waker_ref` | ||
pub(super) unsafe fn clone_arc_raw<T: ArcWake>(data: *const ()) -> RawWaker { | ||
increase_refcount::<T>(data); | ||
RawWaker::new(data, waker_vtable!(T)) | ||
} | ||
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unsafe fn wake_arc_raw<T: ArcWake>(data: *const ()) { | ||
let arc: Arc<T> = Arc::from_raw(data as *const T); | ||
ArcWake::wake(arc); | ||
} | ||
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// used by `waker_ref` | ||
pub(super) 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); | ||
mem::forget(arc); | ||
} | ||
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unsafe fn drop_arc_raw<T: ArcWake>(data: *const ()) { | ||
drop(Arc::<T>::from_raw(data as *const T)) | ||
} |
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