orx-concurrent-recursive-iter 3.0.0

A concurrent iterator that can be extended recursively by each of its items.
Documentation 
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60

use crate::cross_std::local_worker::LocalWorker;
use crate::cross_std::queue::Queue;
use alloc::vec::Vec;
use core::iter::FusedIterator;
use crossbeam_deque::Stealer;
use std::sync::Arc;
use std::sync::atomic::{AtomicBool, AtomicUsize, Ordering};

pub struct DynSeqCrossbeam<I, E>
where
    I: IntoIterator,
    I::Item: Send,
    E: Fn(&I::Item) -> I + Send + Sync,
{
    pub(super) injector: Arc<Queue<I::Item>>,
    pub(super) extend: Arc<E>,
    pub(super) locals: Arc<Vec<LocalWorker<I::Item>>>,
    pub(super) stealers: Arc<Vec<Stealer<I::Item>>>,
    pub(super) pending: Arc<AtomicUsize>,
    pub(super) popped: Arc<AtomicUsize>,
    pub(super) stopped: Arc<AtomicBool>,
}

impl<I, E> Iterator for DynSeqCrossbeam<I, E>
where
    I: IntoIterator,
    I::Item: Send,
    E: Fn(&I::Item) -> I + Send + Sync,
{
    type Item = I::Item;

    fn next(&mut self) -> Option<Self::Item> {
        super::con_iter::ConcurrentRecursiveIterCrossbeamStd::next_impl(
            &self.injector,
            &*self.extend,
            &self.locals,
            &self.stealers,
            &self.pending,
            &self.popped,
            &self.stopped,
            Some(0),
        )
        .map(|(_, x)| x)
    }

    fn size_hint(&self) -> (usize, Option<usize>) {
        match self.stopped.load(Ordering::Acquire) || self.pending.load(Ordering::Acquire) == 0 {
            true => (0, Some(0)),
            false => (0, None),
        }
    }
}

impl<I, E> FusedIterator for DynSeqCrossbeam<I, E>
where
    I: IntoIterator,
    I::Item: Send,
    E: Fn(&I::Item) -> I + Send + Sync,
{
}