async-lock 2.7.0

# async-lock

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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.
* `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.