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//! Extension traits for `std::sync::RwLock`. use std::sync::{RwLock, RwLockReadGuard, RwLockWriteGuard}; /// Extension trait with useful methods for [`std::sync::RwLock`]. /// /// [`std::sync::RwLock`]: https://doc.rust-lang.org/std/sync/struct.RwLock.html pub trait RwLockExt<T> { /// Shorthand for `lock.read().unwrap()` with a better panic message. /// /// This method is intended to be used in situations where poisoned locks are /// considered an exceptional situation and should always result in panic. /// /// # Examples /// /// ``` /// use std::sync::{Arc, RwLock}; /// use stdext::prelude::*; /// /// let lock = Arc::new(RwLock::new(1)); /// /// let n = lock.force_read(); /// assert_eq!(*n, 1); /// ``` fn force_read(&self) -> RwLockReadGuard<T>; /// Shorthand for `lock.write().unwrap()` with a better panic message. /// /// This method is intended to be used in situations where poisoned locks are /// considered an exceptional situation and should always result in panic. /// /// # Examples /// /// ``` /// use std::sync::{Arc, RwLock}; /// use stdext::prelude::*; /// /// let lock = Arc::new(RwLock::new(1)); /// /// { /// let mut n = lock.force_write(); /// *n = 2; /// } /// /// let n = lock.force_read(); /// assert_eq!(*n, 2); /// ``` fn force_write(&self) -> RwLockWriteGuard<T>; } impl<T> RwLockExt<T> for RwLock<T> { fn force_read(&self) -> RwLockReadGuard<T> { self.read() .expect("Unable to obtain read lock: RwLock is poisoned") } fn force_write(&self) -> RwLockWriteGuard<T> { self.write() .expect("Unable to obtain write lock: RwLock is poisoned") } }