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use core::task::{RawWaker, RawWakerVTable, Waker};
use core::ptr::null;
#[cfg(feature = "std")]
use core::cell::UnsafeCell;
unsafe fn noop_clone(_data: *const ()) -> RawWaker {
noop_raw_waker()
}
unsafe fn noop(_data: *const ()) {}
const NOOP_WAKER_VTABLE: RawWakerVTable = RawWakerVTable::new(noop_clone, noop, noop, noop);
fn noop_raw_waker() -> RawWaker {
RawWaker::new(null(), &NOOP_WAKER_VTABLE)
}
#[inline]
pub fn noop_waker() -> Waker {
unsafe {
Waker::from_raw(noop_raw_waker())
}
}
#[inline]
#[cfg(feature = "std")]
pub fn noop_waker_ref() -> &'static Waker {
thread_local! {
static NOOP_WAKER_INSTANCE: UnsafeCell<Waker> =
UnsafeCell::new(noop_waker());
}
NOOP_WAKER_INSTANCE.with(|l| unsafe { &*l.get() })
}