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parking
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Thread parking and unparking
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parking
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# parking [](https://github.com/smol-rs/parking/actions) [](https://github.com/smol-rs/parking) [](https://crates.io/crates/parking) [](https://docs.rs/parking) Thread parking and unparking. A `Parker` is in either the notified or unnotified state. The `park()` method blocks the current thread until the `Parker` becomes notified and then puts it back into the unnotified state. The `unpark()` method puts it into the notified state. This API is similar to [`thread::park()`] and [`Thread::unpark()`] from the standard library. The difference is that the state "token" managed by those functions is shared across an entire thread, and anyone can call [`thread::current()`] to access it. If you use `park` and `unpark`, but you also call a function that uses `park` and `unpark` internally, that function could cause a deadlock by consuming a wakeup that was intended for you. The `Parker` object in this crate avoids that problem by managing its own state, which isn't shared with unrelated callers. [`thread::park()`]: https://doc.rust-lang.org/std/thread/fn.park.html [`Thread::unpark()`]: https://doc.rust-lang.org/std/thread/struct.Thread.html#method.unpark [`thread::current()`]: https://doc.rust-lang.org/std/thread/fn.current.html ## Examples ```rust use std::thread; use std::time::Duration; use parking::Parker; let p = Parker::new(); let u = p.unparker(); // Notify the parker. u.unpark(); // Wakes up immediately because the parker is notified. p.park(); thread::spawn(move || { thread::sleep(Duration::from_millis(500)); u.unpark(); }); // Wakes up when `u.unpark()` notifies and then goes back into unnotified state. p.park(); ``` ## 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.
