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https://github.com/crossbeam-rs/crossbeam

Tools for concurrent programming in Rust
https://github.com/crossbeam-rs/crossbeam

concurrency data-structures lock-free parallelism rust synchronization threads

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Tools for concurrent programming in Rust

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README 

        
# Crossbeam



[![Build Status](https://github.com/crossbeam-rs/crossbeam/workflows/CI/badge.svg)](

https://github.com/crossbeam-rs/crossbeam/actions)

[![License](https://img.shields.io/badge/license-MIT_OR_Apache--2.0-blue.svg)](

https://github.com/crossbeam-rs/crossbeam#license)

[![Cargo](https://img.shields.io/crates/v/crossbeam.svg)](

https://crates.io/crates/crossbeam)

[![Documentation](https://docs.rs/crossbeam/badge.svg)](

https://docs.rs/crossbeam)

[![Rust 1.61+](https://img.shields.io/badge/rust-1.61+-lightgray.svg)](

https://www.rust-lang.org)

[![chat](https://img.shields.io/discord/569610676205781012.svg?logo=discord)](https://discord.com/invite/JXYwgWZ)



This crate provides a set of tools for concurrent programming:



#### Atomics



* [`AtomicCell`], a thread-safe mutable memory location.(no_std)

* [`AtomicConsume`], for reading from primitive atomic types with "consume" ordering.(no_std)



#### Data structures



* [`deque`], work-stealing deques for building task schedulers.

* [`ArrayQueue`], a bounded MPMC queue that allocates a fixed-capacity buffer on construction.(alloc)

* [`SegQueue`], an unbounded MPMC queue that allocates small buffers, segments, on demand.(alloc)



#### Memory management



* [`epoch`], an epoch-based garbage collector.(alloc)



#### Thread synchronization



* [`channel`], multi-producer multi-consumer channels for message passing.

* [`Parker`], a thread parking primitive.

* [`ShardedLock`], a sharded reader-writer lock with fast concurrent reads.

* [`WaitGroup`], for synchronizing the beginning or end of some computation.



#### Utilities



* [`Backoff`], for exponential backoff in spin loops.(no_std)

* [`CachePadded`], for padding and aligning a value to the length of a cache line.(no_std)

* [`scope`], for spawning threads that borrow local variables from the stack.



*Features marked with (no_std) can be used in `no_std` environments.*


*Features marked with (alloc) can be used in `no_std` environments, but only if `alloc`

feature is enabled.*



[`AtomicCell`]: https://docs.rs/crossbeam/latest/crossbeam/atomic/struct.AtomicCell.html

[`AtomicConsume`]: https://docs.rs/crossbeam/latest/crossbeam/atomic/trait.AtomicConsume.html

[`deque`]: https://docs.rs/crossbeam/latest/crossbeam/deque/index.html

[`ArrayQueue`]: https://docs.rs/crossbeam/latest/crossbeam/queue/struct.ArrayQueue.html

[`SegQueue`]: https://docs.rs/crossbeam/latest/crossbeam/queue/struct.SegQueue.html

[`channel`]: https://docs.rs/crossbeam/latest/crossbeam/channel/index.html

[`Parker`]: https://docs.rs/crossbeam/latest/crossbeam/sync/struct.Parker.html

[`ShardedLock`]: https://docs.rs/crossbeam/latest/crossbeam/sync/struct.ShardedLock.html

[`WaitGroup`]: https://docs.rs/crossbeam/latest/crossbeam/sync/struct.WaitGroup.html

[`epoch`]: https://docs.rs/crossbeam/latest/crossbeam/epoch/index.html

[`Backoff`]: https://docs.rs/crossbeam/latest/crossbeam/utils/struct.Backoff.html

[`CachePadded`]: https://docs.rs/crossbeam/latest/crossbeam/utils/struct.CachePadded.html

[`scope`]: https://docs.rs/crossbeam/latest/crossbeam/fn.scope.html



## Crates



The main `crossbeam` crate just [re-exports](src/lib.rs) tools from

smaller subcrates:



* [`crossbeam-channel`](crossbeam-channel)

  provides multi-producer multi-consumer channels for message passing.

* [`crossbeam-deque`](crossbeam-deque)

  provides work-stealing deques, which are primarily intended for building task schedulers.

* [`crossbeam-epoch`](crossbeam-epoch)

  provides epoch-based garbage collection for building concurrent data structures.

* [`crossbeam-queue`](crossbeam-queue)

  provides concurrent queues that can be shared among threads.

* [`crossbeam-utils`](crossbeam-utils)

  provides atomics, synchronization primitives, scoped threads, and other utilities.



There is one more experimental subcrate that is not yet included in `crossbeam`:



* [`crossbeam-skiplist`](crossbeam-skiplist)

  provides concurrent maps and sets based on lock-free skip lists.



## Usage



Add this to your `Cargo.toml`:



```toml

[dependencies]

crossbeam = "0.8"

```



## Compatibility



Crossbeam supports stable Rust releases going back at least six months,

and every time the minimum supported Rust version is increased, a new minor

version is released. Currently, the minimum supported Rust version is 1.61.



## Contributing



Crossbeam welcomes contribution from everyone in the form of suggestions, bug reports,

pull requests, and feedback. 💛



If you need ideas for contribution, there are several ways to get started:



* Found a bug or have a feature request?

  [Submit an issue](https://github.com/crossbeam-rs/crossbeam/issues/new)!

* Issues and PRs labeled with

  [feedback wanted](https://github.com/crossbeam-rs/crossbeam/issues?utf8=%E2%9C%93&q=is%3Aopen+sort%3Aupdated-desc+label%3A%22feedback+wanted%22+)

  need feedback from users and contributors.

* Issues labeled with

  [good first issue](https://github.com/crossbeam-rs/crossbeam/issues?q=is%3Aissue+is%3Aopen+sort%3Aupdated-desc+label%3A%22good+first+issue%22)

  are relatively easy starter issues.



#### RFCs



We also have the [RFCs](https://github.com/crossbeam-rs/rfcs) repository for more

high-level discussion, which is the place where we brainstorm ideas and propose

substantial changes to Crossbeam.



You are welcome to participate in any open

[issues](https://github.com/crossbeam-rs/rfcs/issues?q=is%3Aissue+is%3Aopen+sort%3Aupdated-desc)

or

[pull requests](https://github.com/crossbeam-rs/rfcs/pulls?q=is%3Apr+is%3Aopen+sort%3Aupdated-desc).



#### Learning resources



If you'd like to learn more about concurrency and non-blocking data structures, there's a

list of learning resources in our [wiki](https://github.com/crossbeam-rs/rfcs/wiki),

which includes relevant blog posts, papers, videos, and other similar projects.



Another good place to visit is [merged RFCs](https://github.com/crossbeam-rs/rfcs/tree/master/text).

They contain elaborate descriptions and rationale for features we've introduced to

Crossbeam, but keep in mind that some of the written information is now out of date.



#### Conduct



The Crossbeam project adheres to the

[Rust Code of Conduct](https://www.rust-lang.org/policies/code-of-conduct).

This describes the minimum behavior expected from all contributors.



## 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.



Some Crossbeam subcrates have additional licensing notices.

Take a look at other readme files in this repository for more information.



#### 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.