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A realtime-safe single-producer single-consumer (SPSC) ring buffer

rtrb 최신버젼 다운로드

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Real-Time Ring Buffer
=====================

A wait-free single-producer single-consumer (SPSC) ring buffer for Rust.

* Crate: https://crates.io/crates/rtrb
* Documentation: https://docs.rs/rtrb

This crate can be used without the standard library (`#![no_std]`)
by disabling the `std` feature (which is enabled by default),
but the [alloc](https://doc.rust-lang.org/alloc/) crate is needed nevertheless.

Usage
-----

Add this to your `Cargo.toml`:

```toml
[dependencies]
rtrb = "0.3"
```

Breaking Changes
----------------

For a list of breaking changes
and for instructions how to upgrade between released versions,
have a look at the [changelog](https://github.com/mgeier/rtrb/releases).

Performance
-----------

Measuring the performance of a data structure for inter-thread communication
can be quite brittle and the results depend on many factors.
A few benchmarks for performance comparisons between competing crates
are available at the sub-directory
[`performance-comparison/`](https://github.com/mgeier/rtrb/tree/main/performance-comparison)
and some results thereof are shown in
[issue #39](https://github.com/mgeier/rtrb/issues/39).
Like all benchmarks, they are deeply flawed and to be taken with a grain of salt.
You should make your own measurements that are relevant to your usage patterns.
Feel free to share your own results by commenting on that issue.

Development
-----------

Creating the HTML docs (which will be available in `target/doc/rtrb/index.html`):

cargo doc

Running the tests:

cargo test

Testing the benchmarks (without actually benchmarking):

cargo test --benches

Running the benchmarks (using the [criterion](https://docs.rs/criterion/) crate;
results will be available in `target/criterion/report/index.html`):

cargo bench

Creating [flame graphs](https://github.com/flamegraph-rs/flamegraph) for the benchmarks;
first a few preparations:

cargo install flamegraph
    echo -1 | sudo tee /proc/sys/kernel/perf_event_paranoid
    export CARGO_PROFILE_BENCH_DEBUG=true

Then, creating the flame graph (which will be saved to `flamegraph.svg`),
providing a benchmark (e.g. `two_threads`), a desired runtime and optionally
a benchmark function (e.g. `large`):

cargo flamegraph --bench two_threads -- --bench --profile-time 10 large

To measure code coverage (including branch coverage), nightly Rust is required,
as well as [`cargo-llvm-cov`](https://github.com/taiki-e/cargo-llvm-cov):

rustup toolchain install nightly
    cargo install cargo-llvm-cov

Test coverage data can be obtained and analyzed with this command:

cargo +nightly llvm-cov --branch --doctests --html

This runs the tests (incl. doctests) and creates an HTML report in `target/llvm-cov/html/index.html`.

Testing with Miri also needs nightly Rust:

cargo +nightly miri test

This Miri flag should also be tried:

MIRIFLAGS="-Zmiri-preemption-rate=0" cargo +nightly miri test

Running the tests with ThreadSanitizer requires nightly Rust as well:

RUSTFLAGS="-Z sanitizer=thread" cargo +nightly test --tests -Z build-std --target x86_64-unknown-linux-gnu

You might have to adapt the `--target` option to your system (see e.g. `rustup show`).

Minimum Supported `rustc` Version
---------------------------------

This crate's minimum supported `rustc` version (MSRV) is `1.38.0`.
The MSRV is not expected to be updated frequently, but if it is,
there will be (at least) a *minor* version bump.

Origin Story
------------

The initial code has been ripped off of https://github.com/crossbeam-rs/crossbeam/pull/338,
with permission of the PR author.

It has been isolated from the rest of `crossbeam` with [git-filter-repo]:

git-filter-repo --subdirectory-filter crossbeam-queue --path src/spsc.rs --path tests/spsc.rs --refs refs/heads/spsc

[git-filter-repo]: https://github.com/newren/git-filter-repo

Alternatives
------------

If you don't like this crate, no problem, there are several alternatives for you to choose from.
There are many varieties of ring buffers available, here we limit the selection
to wait-free SPSC implementations:

* [ach-spsc](https://crates.io/crates/ach-spsc) (using const generics)
* [fq](https://crates.io/crates/fq)
* [gil](https://crates.io/crates/gil) (see `gil::spsc`)
* [heapless](https://crates.io/crates/heapless) (for embedded systems, see `heapless::spsc`)
* [jack](https://crates.io/crates/jack) (FFI bindings for JACK, see `jack::Ringbuffer`)
* [magnetic](https://crates.io/crates/magnetic) (see `magnetic::spsc` module)
* [nexus-queue](https://crates.io/crates/nexus-queue) (see `nexus_queue::spsc` module)
* [npnc](https://crates.io/crates/npnc) (see `npnc::bounded::spsc` module)
* [omango](https://crates.io/crates/omango) (see `omango::queue::spsc::bounded()`)
* [ringbuf](https://crates.io/crates/ringbuf) (supports const generics and heap allocation)
* [ringbuffer-spsc](https://crates.io/crates/ringbuffer-spsc) (using const generics)
* [shmem-ipc](https://crates.io/crates/shmem-ipc) (see `shmem_ipc::sharedring` and `shmem_ipc::ringbuf` modules)
* [smallring](https://crates.io/crates/smallring) (see `smallring::spsc` module)

There are also implementations in other languages:

* [atomic_queues](https://github.com/joadnacer/atomic_queues) (C++)
* [boost::lockfree::spsc_queue](https://www.boost.org/doc/libs/master/doc/html/boost/lockfree/spsc_queue.html) (C++)
* [folly::ProducerConsumerQueue](https://github.com/facebook/folly/blob/main/folly/docs/ProducerConsumerQueue.md) (C++)
* [JACK ring buffer](https://jackaudio.org/api/ringbuffer_8h.html)  (C)
* [lockfree::spsc::RingBuf](https://github.com/DNedic/lockfree) (C++)
* [PortAudio ring buffer](http://portaudio.com/docs/v19-doxydocs-dev/pa__ringbuffer_8h.html) (C)
* [readerwriterqueue](https://github.com/cameron314/readerwriterqueue) (C++)
* [ringbuf.js](https://github.com/padenot/ringbuf.js) (JavaScript, using `SharedArrayBuffer`)
* [spsc_queue](https://github.com/Deaod/spsc_queue) (C++)
* [SPSC-Queue](https://github.com/drogalis/SPSC-Queue) (C++)
* [SPSCQueue](https://github.com/rigtorp/SPSCQueue) (C++)

If you know more alternatives for this list,
please [open an issue](https://github.com/mgeier/rtrb/issues).

License
-------

Licensed under either of

* Apache License, Version 2.0 ([LICENSE-APACHE](LICENSE-APACHE) or http://www.apache.org/licenses/LICENSE-2.0)
 * MIT license ([LICENSE-MIT](LICENSE-MIT) or http://opensource.org/licenses/MIT)

at your option.

Note that this crate contains a copy of the file `cache_padded.rs` from
https://github.com/crossbeam-rs/crossbeam.

#### 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.

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