# async-lock
Async synchronization primitives.
This crate provides the following primitives:
* `Barrier` - enables tasks to synchronize all together at the same time.
* `Mutex` - a mutual exclusion lock.
* `OnceCell` - a memory location that can be written to at most once.
* `RwLock` - a reader-writer lock, allowing any number of readers or a single writer.
* `Semaphore` - limits the number of concurrent operations.
## 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.