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# Crossbeam Utils
[](
https://travis-ci.org/crossbeam-rs/crossbeam)
[](
https://github.com/crossbeam-rs/crossbeam-utils/tree/master/src)
[](
https://crates.io/crates/crossbeam-utils)
[](
https://docs.rs/crossbeam-utils)
[](
https://www.rust-lang.org)
This crate provides miscellaneous tools for concurrent programming:
#### Atomics
* [`AtomicCell`], a thread-safe mutable memory location.<sup>(\*)</sup>
* [`AtomicConsume`], for reading from primitive atomic types with "consume" ordering.<sup>(\*)</sup>
#### Thread synchronization
* [`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.<sup>(\*)</sup>
* [`CachePadded`], for padding and aligning a value to the length of a cache line.<sup>(\*)</sup>
* [`scope`], for spawning threads that borrow local variables from the stack.
*Features marked with <sup>(\*)</sup> can be used in `no_std` environments.*
[`AtomicCell`]: https://docs.rs/crossbeam-utils/*/crossbeam_utils/atomic/struct.AtomicCell.html
[`AtomicConsume`]: https://docs.rs/crossbeam-utils/*/crossbeam_utils/atomic/trait.AtomicConsume.html
[`Parker`]: https://docs.rs/crossbeam-utils/*/crossbeam_utils/sync/struct.Parker.html
[`ShardedLock`]: https://docs.rs/crossbeam-utils/*/crossbeam_utils/sync/struct.ShardedLock.html
[`WaitGroup`]: https://docs.rs/crossbeam-utils/*/crossbeam_utils/sync/struct.WaitGroup.html
[`Backoff`]: https://docs.rs/crossbeam-utils/*/crossbeam_utils/struct.Backoff.html
[`CachePadded`]: https://docs.rs/crossbeam-utils/*/crossbeam_utils/struct.CachePadded.html
[`scope`]: https://docs.rs/crossbeam-utils/*/crossbeam_utils/thread/fn.scope.html
## Usage
Add this to your `Cargo.toml`:
```toml
[dependencies]
crossbeam-utils = "0.6"
```
Next, add this to your crate:
```rust
extern crate crossbeam_utils;
```
## 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.
#### 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.
|
