ringbuf-basedrop

Crates.ioringbuf-basedrop
lib.rsringbuf-basedrop
version0.1.1
sourcesrc
created_at2022-05-30 19:37:45.587076
updated_at2022-05-30 22:05:44.059648
descriptionA fork of the `ringbuf` crate that uses basedrop's Shared pointer in place of Arc
homepagehttps://github.com/RustyDAW/ringbuf-basedrop
repositoryhttps://github.com/RustyDAW/ringbuf-basedrop.git
max_upload_size
id597121
size97,815
Billy Messenger (BillyDM)

documentation

https://docs.rs/ringbuf-basedrop

README

ringbuf-basedrop

Crates.io Docs.rs Github Actions License

This is a fork of the ringbuf crate that uses basedrop's Shared pointer in place of Arc. This ensures that when all references to the ring buffer are dropped, the underlying Vec will never potentially get deallocated (a non-realtime safe operation) in the realtime thread. Instead, all allocations are cleaned up in whatever thread owns the basedrop Collector object.

This is especially useful for audio applications.


Lock-free single-producer single-consumer (SPSC) FIFO ring buffer with direct access to inner data.

Overview

RingBuffer is the initial structure representing ring buffer itself. Ring buffer can be splitted into pair of Producer and Consumer.

Producer and Consumer are used to append/remove elements to/from the ring buffer accordingly. They can be safely transfered between threads. Operations with Producer and Consumer are lock-free - they're succeded or failed immediately without blocking or waiting.

Elements can be effectively appended/removed one by one or many at once. Also data could be loaded/stored directly into/from Read/Write instances. And finally, there are unsafe methods allowing thread-safe direct access in place to the inner memory being appended/removed.

When building with nightly toolchain it is possible to run benchmarks via cargo bench --features benchmark.

Also the crate could be used with no_std (but alloc is still required).

Examples

Simple example

use basedrop::Collector;
use ringbuf::RingBuffer;

let collector = Collector::new();

let rb = RingBuffer::<i32>::new(2);
let (mut prod, mut cons) = rb.split(&collector.handle());

prod.push(0).unwrap();
prod.push(1).unwrap();
assert_eq!(prod.push(2), Err(2));

assert_eq!(cons.pop().unwrap(), 0);

prod.push(2).unwrap();

assert_eq!(cons.pop().unwrap(), 1);
assert_eq!(cons.pop().unwrap(), 2);
assert_eq!(cons.pop(), None);

Message transfer

This is more complicated example of transfering text message between threads.

use std::io::Read;
use std::thread;
use std::time::Duration;

use basedrop::Collector;
use ringbuf::RingBuffer;

let collector = Collector::new();

let buf = RingBuffer::<u8>::new(10);
let (mut prod, mut cons) = buf.split(&collector.handle());

let smsg = "The quick brown fox jumps over the lazy dog";

let pjh = thread::spawn(move || {
    println!("-> sending message: '{}'", smsg);

    let zero = [0];
    let mut bytes = smsg.as_bytes().chain(&zero[..]);
    loop {
        if prod.is_full() {
            println!("-> buffer is full, waiting");
            thread::sleep(Duration::from_millis(1));
        } else {
            let n = prod.read_from(&mut bytes, None).unwrap();
            if n == 0 {
                break;
            }
            println!("-> {} bytes sent", n);
        }
    }

    println!("-> message sent");
});

let cjh = thread::spawn(move || {
    println!("<- receiving message");

    let mut bytes = Vec::<u8>::new();
    loop {
        if cons.is_empty() {
            if bytes.ends_with(&[0]) {
                break;
            } else {
                println!("<- buffer is empty, waiting");
                thread::sleep(Duration::from_millis(1));
            }
        } else {
            let n = cons.write_into(&mut bytes, None).unwrap();
            println!("<- {} bytes received", n);
        }
    }

    assert_eq!(bytes.pop().unwrap(), 0);
    let msg = String::from_utf8(bytes).unwrap();
    println!("<- message received: '{}'", msg);

    msg
});

pjh.join().unwrap();
let rmsg = cjh.join().unwrap();

assert_eq!(smsg, rmsg);

License

Licensed under either of

at your option.

Contribution

Unless you explicitly state otherwise, any contribution intentionally submitted for inclusion in the work by you, as defined in the Apache-2.0 license, shall be dual licensed as above, without any additional terms or conditions.

Commit count: 0

cargo fmt