Adding upstream version 115.7.0esr.upstream/115.7.0esr

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 67 insertions, 0 deletions

diff --git a/third_party/rust/ringbuf/src/lib.rs b/third_party/rust/ringbuf/src/lib.rs
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+//! 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 sent between threads.
+//! Operations with `Producer` and `Consumer` are lock-free - they succeed or fail 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.
+//!
+//! [`Read`]: https://doc.rust-lang.org/std/io/trait.Read.html
+//! [`Write`]: https://doc.rust-lang.org/std/io/trait.Write.html
+//!
+//! When building with nightly toolchain it is possible to run benchmarks via `cargo bench --features benchmark`.
+//!
+//! # Examples
+//!
+//! ## Simple example
+//!
+//! ```rust
+//! # extern crate ringbuf;
+//! use ringbuf::RingBuffer;
+//! # fn main() {
+//! let rb = RingBuffer::<i32>::new(2);
+//! let (mut prod, mut cons) = rb.split();
+//!
+//! 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);
+//! # }
+//! ```
+
+#![no_std]
+#![cfg_attr(feature = "benchmark", feature(test))]
+
+extern crate alloc;
+#[cfg(feature = "std")]
+extern crate std;
+
+#[cfg(feature = "benchmark")]
+extern crate test;
+
+#[cfg(feature = "benchmark")]
+mod benchmark;
+
+#[cfg(test)]
+mod tests;
+
+mod consumer;
+mod producer;
+mod ring_buffer;
+
+pub use consumer::*;
+pub use producer::*;
+pub use ring_buffer::*;