ringbuf 0.3.1

Lock-free SPSC FIFO ring buffer with direct access to inner data
Documentation 
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use crate::{ring_buffer::RbBase as _, HeapRb};
#[cfg(feature = "std")]
use std::thread;

fn head_tail<T>(ring_buffer: &HeapRb<T>) -> (usize, usize) {
    (ring_buffer.head(), ring_buffer.tail())
}

#[test]
fn capacity() {
    let cap = 13;
    let buf = HeapRb::<i32>::new(cap);
    assert_eq!(buf.capacity().get(), cap);
}
#[test]
fn split_capacity() {
    let cap = 13;
    let buf = HeapRb::<i32>::new(cap);
    let (prod, cons) = buf.split();

    assert_eq!(prod.capacity(), cap);
    assert_eq!(cons.capacity(), cap);
}

#[cfg(feature = "std")]
#[test]
fn split_threads() {
    let buf = HeapRb::<i32>::new(10);
    let (prod, cons) = buf.split();

    let pjh = thread::spawn(move || {
        let _ = prod;
    });

    let cjh = thread::spawn(move || {
        let _ = cons;
    });

    pjh.join().unwrap();
    cjh.join().unwrap();
}

#[test]
fn push() {
    let cap = 2;
    let buf = HeapRb::<i32>::new(cap);
    let (mut prod, _) = buf.split();

    assert_eq!(head_tail(prod.rb()), (0, 0));

    assert_eq!(prod.push(123), Ok(()));
    assert_eq!(head_tail(prod.rb()), (0, 1));

    assert_eq!(prod.push(234), Ok(()));
    assert_eq!(head_tail(prod.rb()), (0, 2));

    assert_eq!(prod.push(345), Err(345));
    assert_eq!(head_tail(prod.rb()), (0, 2));
}

#[test]
fn pop_empty() {
    let cap = 2;
    let buf = HeapRb::<i32>::new(cap);
    let (_, mut cons) = buf.split();

    assert_eq!(head_tail(cons.rb()), (0, 0));

    assert_eq!(cons.pop(), None);
    assert_eq!(head_tail(cons.rb()), (0, 0));
}

#[test]
fn push_pop_one() {
    let cap = 2;
    let buf = HeapRb::<i32>::new(cap);
    let (mut prod, mut cons) = buf.split();

    let vcap = 2 * cap;
    let values = [12, 34, 56, 78, 90];
    assert_eq!(head_tail(cons.rb()), (0, 0));

    for (i, v) in values.iter().enumerate() {
        assert_eq!(prod.push(*v), Ok(()));
        assert_eq!(head_tail(cons.rb()), (i % vcap, (i + 1) % vcap));

        assert_eq!(cons.pop().unwrap(), *v);
        assert_eq!(head_tail(cons.rb()), ((i + 1) % vcap, (i + 1) % vcap));

        assert_eq!(cons.pop(), None);
        assert_eq!(head_tail(cons.rb()), ((i + 1) % vcap, (i + 1) % vcap));
    }
}

#[test]
fn push_pop_all() {
    let cap = 2;
    let buf = HeapRb::<i32>::new(cap);
    let (mut prod, mut cons) = buf.split();

    let vcap = 2 * cap;
    let values = [(12, 34, 13), (56, 78, 57), (90, 10, 91)];
    assert_eq!(head_tail(cons.rb()), (0, 0));

    for (i, v) in values.iter().enumerate() {
        assert_eq!(prod.push(v.0), Ok(()));
        assert_eq!(head_tail(cons.rb()), (cap * i % vcap, (cap * i + 1) % vcap));

        assert_eq!(prod.push(v.1), Ok(()));
        assert_eq!(head_tail(cons.rb()), (cap * i % vcap, (cap * i + 2) % vcap));

        assert_eq!(prod.push(v.2).unwrap_err(), v.2);
        assert_eq!(head_tail(cons.rb()), (cap * i % vcap, (cap * i + 2) % vcap));

        assert_eq!(cons.pop().unwrap(), v.0);
        assert_eq!(
            head_tail(cons.rb()),
            ((cap * i + 1) % vcap, (cap * i + 2) % vcap)
        );

        assert_eq!(cons.pop().unwrap(), v.1);
        assert_eq!(
            head_tail(cons.rb()),
            ((cap * i + 2) % vcap, (cap * i + 2) % vcap)
        );

        assert_eq!(cons.pop(), None);
        assert_eq!(
            head_tail(cons.rb()),
            ((cap * i + 2) % vcap, (cap * i + 2) % vcap)
        );
    }
}

#[test]
fn empty_full() {
    let buf = HeapRb::<i32>::new(1);
    let (mut prod, cons) = buf.split();

    assert!(prod.is_empty());
    assert!(cons.is_empty());
    assert!(!prod.is_full());
    assert!(!cons.is_full());

    assert_eq!(prod.push(123), Ok(()));

    assert!(!prod.is_empty());
    assert!(!cons.is_empty());
    assert!(prod.is_full());
    assert!(cons.is_full());
}

#[test]
fn len_remaining() {
    let buf = HeapRb::<i32>::new(2);
    let (mut prod, mut cons) = buf.split();

    assert_eq!(prod.len(), 0);
    assert_eq!(cons.len(), 0);
    assert_eq!(prod.free_len(), 2);
    assert_eq!(cons.free_len(), 2);

    assert_eq!(prod.push(123), Ok(()));

    assert_eq!(prod.len(), 1);
    assert_eq!(cons.len(), 1);
    assert_eq!(prod.free_len(), 1);
    assert_eq!(cons.free_len(), 1);

    assert_eq!(prod.push(456), Ok(()));

    assert_eq!(prod.len(), 2);
    assert_eq!(cons.len(), 2);
    assert_eq!(prod.free_len(), 0);
    assert_eq!(cons.free_len(), 0);

    assert_eq!(cons.pop(), Some(123));

    assert_eq!(prod.len(), 1);
    assert_eq!(cons.len(), 1);
    assert_eq!(prod.free_len(), 1);
    assert_eq!(cons.free_len(), 1);

    assert_eq!(cons.pop(), Some(456));

    assert_eq!(prod.len(), 0);
    assert_eq!(cons.len(), 0);
    assert_eq!(prod.free_len(), 2);
    assert_eq!(cons.free_len(), 2);

    assert_eq!(prod.push(789), Ok(()));

    assert_eq!(prod.len(), 1);
    assert_eq!(cons.len(), 1);
    assert_eq!(prod.free_len(), 1);
    assert_eq!(cons.free_len(), 1);
}