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diff --git a/vendor/try-lock/README.md b/vendor/try-lock/README.md new file mode 100644 index 000000000..abbb0eac4 --- /dev/null +++ b/vendor/try-lock/README.md @@ -0,0 +1,44 @@ +# TryLock + +- [Crates.io](https://crates.io/crates/try-lock) +- [Docs](https://docs.rs/try-lock) + +A light-weight lock guarded by an atomic boolean. + +Most efficient when contention is low, acquiring the lock is a single atomic swap, and releasing it just 1 more atomic swap. + +## Example + +```rust +use std::sync::Arc; +use try_lock::TryLock; + +// a thing we want to share +struct Widget { + name: String, +} + +// lock it up! +let widget1 = Arc::new(TryLock::new(Widget { + name: "Spanner".into(), +})); + +let widget2 = widget1.clone(); + + +// mutate the widget +let mut locked = widget1.try_lock().expect("example isn't locked yet"); +locked.name.push_str(" Bundle"); + +// hands off, buddy +let not_locked = widget2.try_lock(); +assert!(not_locked.is_none(), "widget1 has the lock"); + +// ok, you can have it +drop(locked); + +let locked2 = widget2.try_lock().expect("widget1 lock is released"); + +assert_eq!(locked2.name, "Spanner Bundle"); +``` + |