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use super::FuturesUnordered;
use super::task::Task;
use core::marker::PhantomData;
use core::pin::Pin;
use core::sync::atomic::Ordering::Relaxed;
#[derive(Debug)]
pub struct IterPinMut<'a, Fut> {
pub(super) task: *const Task<Fut>,
pub(super) len: usize,
pub(super) _marker: PhantomData<&'a mut FuturesUnordered<Fut>>
}
#[derive(Debug)]
pub struct IterMut<'a, Fut: Unpin> (pub(super) IterPinMut<'a, Fut>);
#[derive(Debug)]
pub struct IterPinRef<'a, Fut> {
pub(super) task: *const Task<Fut>,
pub(super) len: usize,
pub(super) pending_next_all: *mut Task<Fut>,
pub(super) _marker: PhantomData<&'a FuturesUnordered<Fut>>
}
#[derive(Debug)]
pub struct Iter<'a, Fut: Unpin> (pub(super) IterPinRef<'a, Fut>);
impl<'a, Fut> Iterator for IterPinMut<'a, Fut> {
type Item = Pin<&'a mut Fut>;
fn next(&mut self) -> Option<Pin<&'a mut Fut>> {
if self.task.is_null() {
return None;
}
unsafe {
let future = (*(*self.task).future.get()).as_mut().unwrap();
let next = (*self.task).next_all.load(Relaxed);
self.task = next;
self.len -= 1;
Some(Pin::new_unchecked(future))
}
}
fn size_hint(&self) -> (usize, Option<usize>) {
(self.len, Some(self.len))
}
}
impl<Fut> ExactSizeIterator for IterPinMut<'_, Fut> {}
impl<'a, Fut: Unpin> Iterator for IterMut<'a, Fut> {
type Item = &'a mut Fut;
fn next(&mut self) -> Option<&'a mut Fut> {
self.0.next().map(Pin::get_mut)
}
fn size_hint(&self) -> (usize, Option<usize>) {
self.0.size_hint()
}
}
impl<Fut: Unpin> ExactSizeIterator for IterMut<'_, Fut> {}
impl<'a, Fut> Iterator for IterPinRef<'a, Fut> {
type Item = Pin<&'a Fut>;
fn next(&mut self) -> Option<Pin<&'a Fut>> {
if self.task.is_null() {
return None;
}
unsafe {
let future = (*(*self.task).future.get()).as_ref().unwrap();
let next = (*self.task).spin_next_all(
self.pending_next_all,
Relaxed,
);
self.task = next;
self.len -= 1;
Some(Pin::new_unchecked(future))
}
}
fn size_hint(&self) -> (usize, Option<usize>) {
(self.len, Some(self.len))
}
}
impl<Fut> ExactSizeIterator for IterPinRef<'_, Fut> {}
impl<'a, Fut: Unpin> Iterator for Iter<'a, Fut> {
type Item = &'a Fut;
fn next(&mut self) -> Option<&'a Fut> {
self.0.next().map(Pin::get_ref)
}
fn size_hint(&self) -> (usize, Option<usize>) {
self.0.size_hint()
}
}
impl<Fut: Unpin> ExactSizeIterator for Iter<'_, Fut> {}