oneringbuf 0.7.0

A lock-free single-producer, single-consumer (SPSC) ring buffer with in-place mutability, asynchronous support, and virtual memory optimisation.
Documentation 
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extern crate alloc;

use crate::{common_def, get_buf};
use oneringbuf::iterators::Detached;
use oneringbuf::iterators::{ConsIter, ProdIter, WorkIter};
use oneringbuf::{IntoRef, ORBIterator, OneRB};

common_def!();

fn fill_buf(prod: &mut ProdIter<impl IntoRef + OneRB<Item = usize>>) {
    let slice = (0..BUFFER_SIZE - 1).collect::<Vec<usize>>();
    prod.push_slice(&slice);
}

#[allow(clippy::type_complexity)]
fn prepare<B: IntoRef + OneRB<Item = usize>>(
    mut prod: ProdIter<B>,
    mut work: WorkIter<B>,
    mut cons: ConsIter<B>,
) -> (ProdIter<B>, Detached<WorkIter<B>>, ConsIter<B>) {
    assert_eq!(prod.available(), BUFFER_SIZE - 1);
    assert_eq!(work.available(), 0);
    assert_eq!(cons.available(), 0);

    fill_buf(&mut prod);

    assert_eq!(prod.available(), 0);
    assert_eq!(work.available(), BUFFER_SIZE - 1);
    assert_eq!(cons.available(), 0);

    let mut work = work.detach();

    for _ in 0..BUFFER_SIZE - 1 {
        if let Some(data) = work.get_mut() {
            *data += 1;
            unsafe { work.advance(1) };
        }
    }
    assert_eq!(prod.available(), 0);
    assert_eq!(work.available(), 0);
    assert_eq!(cons.available(), 0);

    (prod, work, cons)
}

#[test]
fn test_work_detached_sync_index() {
    let mut buf = get_buf!(SharedMut);
    let (prod, work, cons) = buf.split_mut();

    let (mut prod, mut work, mut cons) = prepare(prod, work, cons);

    work.sync_index();

    assert_eq!(prod.available(), 0);
    assert_eq!(work.available(), 0);
    assert_eq!(cons.available(), BUFFER_SIZE - 1);

    for i in 0..BUFFER_SIZE - 1 {
        assert_eq!(cons.pop().unwrap(), i + 1);
    }

    assert_eq!(prod.available(), BUFFER_SIZE - 1);
    assert_eq!(work.available(), 0);
    assert_eq!(cons.available(), 0);
}

#[test]
fn test_work_detached() {
    let mut buf = get_buf!(SharedMut);
    let (prod, work, cons) = buf.split_mut();

    let (mut prod, work, mut cons) = prepare(prod, work, cons);

    let mut work = work.attach();

    assert_eq!(prod.available(), 0);
    assert_eq!(work.available(), 0);
    assert_eq!(cons.available(), BUFFER_SIZE - 1);

    for i in 0..BUFFER_SIZE - 1 {
        assert_eq!(cons.pop().unwrap(), i + 1);
    }

    assert_eq!(prod.available(), BUFFER_SIZE - 1);
    assert_eq!(work.available(), 0);
    assert_eq!(cons.available(), 0);
}

#[test]
fn test_work_detached_set_index() {
    let mut buf = get_buf!(SharedMut);
    let (prod, work, cons) = buf.split_mut();

    let (mut prod, mut work, mut cons) = prepare(prod, work, cons);

    unsafe {
        work.set_index(work.index() - 1);
    }

    assert_eq!(prod.available(), 0);
    assert_eq!(work.available(), 1);
    assert_eq!(cons.available(), 0);

    let mut work = work.attach();

    assert_eq!(prod.available(), 0);
    assert_eq!(work.available(), 1);
    assert_eq!(cons.available(), BUFFER_SIZE - 2);

    for i in 0..BUFFER_SIZE - 2 {
        assert_eq!(cons.pop().unwrap(), i + 1);
    }

    assert_eq!(prod.available(), BUFFER_SIZE - 2);
    assert_eq!(work.available(), 1);
    assert_eq!(cons.available(), 0);
}

#[test]
fn test_work_go_back() {
    let mut buf = get_buf!(SharedMut);
    let (_, work, _) = buf.split_mut();

    let mut work = work.detach();

    assert_eq!(work.index(), 0);

    unsafe {
        work.go_back(1);
    }

    assert_eq!(work.index(), BUFFER_SIZE - 1);

    unsafe {
        work.advance(2);
    }

    assert_eq!(work.index(), 1);

    unsafe {
        work.go_back(1);
    }

    assert_eq!(work.index(), 0);
}