parking-2.2.0/.cargo_vcs_info.json0000644000000001360000000000100124700ustar { "git": { "sha1": "2aa2aece0f9a539630c61b726754b5ed273f6724" }, "path_in_vcs": "" }parking-2.2.0/CHANGELOG.md000064400000000000000000000012201046102023000130640ustar 00000000000000# Version 2.2.0 - Implement `From` for `Waker`. This enables `Waker`s to be constructed from `Unparker`s without allocating. (#18) # Version 2.1.1 - Update docs with new logo. (#14) # Version 2.1.0 - Add will_unpark and same_parker methods to Unparker. (#10) # Version 2.0.0 - Return `bool` from `unpark()` methods. # Version 1.0.6 - Add more details on licensing. # Version 1.0.5 - Implement `Default` for `Parker`. # Version 1.0.4 - Forbid unsafe code. # Version 1.0.3 - Improved documentation. # Version 1.0.2 - Remove all unsafe code. # Version 1.0.1 - Explain `Parker::park()` better. # Version 1.0.0 - Initial version. parking-2.2.0/Cargo.toml0000644000000021570000000000100104730ustar # THIS FILE IS AUTOMATICALLY GENERATED BY CARGO # # When uploading crates to the registry Cargo will automatically # "normalize" Cargo.toml files for maximal compatibility # with all versions of Cargo and also rewrite `path` dependencies # to registry (e.g., crates.io) dependencies. # # If you are reading this file be aware that the original Cargo.toml # will likely look very different (and much more reasonable). # See Cargo.toml.orig for the original contents. [package] edition = "2018" rust-version = "1.51" name = "parking" version = "2.2.0" authors = [ "Stjepan Glavina ", "The Rust Project Developers", ] exclude = ["/.*"] description = "Thread parking and unparking" homepage = "https://github.com/smol-rs/parking" documentation = "https://docs.rs/parking" readme = "README.md" keywords = [ "park", "notify", "thread", "wake", "condition", ] categories = ["concurrency"] license = "Apache-2.0 OR MIT" repository = "https://github.com/smol-rs/parking" [dev-dependencies.easy-parallel] version = "3.0.0" [target."cfg(loom)".dependencies.loom] version = "0.7" optional = true parking-2.2.0/Cargo.toml.orig000064400000000000000000000015621046102023000141530ustar 00000000000000[package] name = "parking" # When publishing a new version: # - Update CHANGELOG.md # - Create "v2.x.y" git tag version = "2.2.0" authors = [ "Stjepan Glavina ", "The Rust Project Developers", ] edition = "2018" rust-version = "1.51" description = "Thread parking and unparking" license = "Apache-2.0 OR MIT" repository = "https://github.com/smol-rs/parking" homepage = "https://github.com/smol-rs/parking" documentation = "https://docs.rs/parking" keywords = ["park", "notify", "thread", "wake", "condition"] categories = ["concurrency"] exclude = ["/.*"] # The `loom` feature, combined with the `loom` rustflag, enables a reimplementation # of `parking` using `loom`. This feature is perma-unstable and should not be used # in stable code. [target.'cfg(loom)'.dependencies.loom] version = "0.7" optional = true [dev-dependencies] easy-parallel = "3.0.0" parking-2.2.0/LICENSE-APACHE000064400000000000000000000251371046102023000132140ustar 00000000000000 Apache License Version 2.0, January 2004 http://www.apache.org/licenses/ TERMS AND CONDITIONS FOR USE, REPRODUCTION, AND DISTRIBUTION 1. Definitions. "License" shall mean the terms and conditions for use, reproduction, and distribution as defined by Sections 1 through 9 of this document. "Licensor" shall mean the copyright owner or entity authorized by the copyright owner that is granting the License. "Legal Entity" shall mean the union of the acting entity and all other entities that control, are controlled by, or are under common control with that entity. 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IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. parking-2.2.0/LICENSE-THIRD-PARTY000064400000000000000000000007031046102023000140320ustar 00000000000000=============================================================================== Copyright 2014-2020 The Rust Project Developers Licensed under the Apache License, Version 2.0 or the MIT license , at your option. All files in the project carrying such notice may not be copied, modified, or distributed except according to those terms. parking-2.2.0/README.md000064400000000000000000000031011046102023000125320ustar 00000000000000# parking [![Build](https://github.com/smol-rs/parking/workflows/Build%20and%20test/badge.svg)]( https://github.com/smol-rs/parking/actions) [![License](https://img.shields.io/badge/license-Apache--2.0_OR_MIT-blue.svg)]( https://github.com/smol-rs/parking) [![Cargo](https://img.shields.io/crates/v/parking.svg)]( https://crates.io/crates/parking) [![Documentation](https://docs.rs/parking/badge.svg)]( https://docs.rs/parking) Thread parking and unparking. A parker is in either notified or unnotified state. Method `park()` blocks the current thread until the parker becomes notified and then puts it back into unnotified state. Method `unpark()` puts it into notified state. ## 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. parking-2.2.0/src/lib.rs000064400000000000000000000302551046102023000131700ustar 00000000000000//! Thread parking and unparking. //! //! A parker is in either notified or unnotified state. Method [`park()`][`Parker::park()`] blocks //! the current thread until the parker becomes notified and then puts it back into unnotified //! state. Method [`unpark()`][`Unparker::unpark()`] puts it into notified state. //! //! # Examples //! //! ``` //! 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(); //! ``` #![forbid(unsafe_code)] #![warn(missing_docs, missing_debug_implementations, rust_2018_idioms)] #![doc( html_favicon_url = "https://raw.githubusercontent.com/smol-rs/smol/master/assets/images/logo_fullsize_transparent.png" )] #![doc( html_logo_url = "https://raw.githubusercontent.com/smol-rs/smol/master/assets/images/logo_fullsize_transparent.png" )] #[cfg(not(all(loom, feature = "loom")))] use std::sync; #[cfg(all(loom, feature = "loom"))] use loom::sync; use std::cell::Cell; use std::fmt; use std::marker::PhantomData; use std::sync::Arc; use std::task::{Wake, Waker}; use std::time::Duration; #[cfg(not(all(loom, feature = "loom")))] use std::time::Instant; use sync::atomic::AtomicUsize; use sync::atomic::Ordering::SeqCst; use sync::{Condvar, Mutex}; /// Creates a parker and an associated unparker. /// /// # Examples /// /// ``` /// let (p, u) = parking::pair(); /// ``` pub fn pair() -> (Parker, Unparker) { let p = Parker::new(); let u = p.unparker(); (p, u) } /// Waits for a notification. pub struct Parker { unparker: Unparker, _marker: PhantomData>, } impl Parker { /// Creates a new parker. /// /// # Examples /// /// ``` /// use parking::Parker; /// /// let p = Parker::new(); /// ``` /// pub fn new() -> Parker { Parker { unparker: Unparker { inner: Arc::new(Inner { state: AtomicUsize::new(EMPTY), lock: Mutex::new(()), cvar: Condvar::new(), }), }, _marker: PhantomData, } } /// Blocks until notified and then goes back into unnotified state. /// /// # Examples /// /// ``` /// 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(); /// ``` pub fn park(&self) { self.unparker.inner.park(None); } /// Blocks until notified and then goes back into unnotified state, or times out after /// `duration`. /// /// Returns `true` if notified before the timeout. /// /// # Examples /// /// ``` /// use std::time::Duration; /// use parking::Parker; /// /// let p = Parker::new(); /// /// // Wait for a notification, or time out after 500 ms. /// p.park_timeout(Duration::from_millis(500)); /// ``` #[cfg(not(loom))] pub fn park_timeout(&self, duration: Duration) -> bool { self.unparker.inner.park(Some(duration)) } /// Blocks until notified and then goes back into unnotified state, or times out at `instant`. /// /// Returns `true` if notified before the deadline. /// /// # Examples /// /// ``` /// use std::time::{Duration, Instant}; /// use parking::Parker; /// /// let p = Parker::new(); /// /// // Wait for a notification, or time out after 500 ms. /// p.park_deadline(Instant::now() + Duration::from_millis(500)); /// ``` #[cfg(not(loom))] pub fn park_deadline(&self, instant: Instant) -> bool { self.unparker .inner .park(Some(instant.saturating_duration_since(Instant::now()))) } /// Notifies the parker. /// /// Returns `true` if this call is the first to notify the parker, or `false` if the parker /// was already notified. /// /// # Examples /// /// ``` /// use std::thread; /// use std::time::Duration; /// use parking::Parker; /// /// let p = Parker::new(); /// /// assert_eq!(p.unpark(), true); /// assert_eq!(p.unpark(), false); /// /// // Wakes up immediately. /// p.park(); /// ``` pub fn unpark(&self) -> bool { self.unparker.unpark() } /// Returns a handle for unparking. /// /// The returned [`Unparker`] can be cloned and shared among threads. /// /// # Examples /// /// ``` /// 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(); /// ``` pub fn unparker(&self) -> Unparker { self.unparker.clone() } } impl Default for Parker { fn default() -> Parker { Parker::new() } } impl fmt::Debug for Parker { fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result { f.pad("Parker { .. }") } } /// Notifies a parker. pub struct Unparker { inner: Arc, } impl Unparker { /// Notifies the associated parker. /// /// Returns `true` if this call is the first to notify the parker, or `false` if the parker /// was already notified. /// /// # Examples /// /// ``` /// use std::thread; /// use std::time::Duration; /// use parking::Parker; /// /// let p = Parker::new(); /// let u = p.unparker(); /// /// 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(); /// ``` pub fn unpark(&self) -> bool { self.inner.unpark() } /// Indicates whether this unparker will unpark the associated parker. /// /// This can be used to avoid unnecessary work before calling `unpark()`. /// /// # Examples /// /// ``` /// use parking::Parker; /// /// let p = Parker::new(); /// let u = p.unparker(); /// /// assert!(u.will_unpark(&p)); /// ``` pub fn will_unpark(&self, parker: &Parker) -> bool { Arc::ptr_eq(&self.inner, &parker.unparker.inner) } /// Indicates whether two unparkers will unpark the same parker. /// /// # Examples /// /// ``` /// use parking::Parker; /// /// let p = Parker::new(); /// let u1 = p.unparker(); /// let u2 = p.unparker(); /// /// assert!(u1.same_parker(&u2)); /// ``` pub fn same_parker(&self, other: &Unparker) -> bool { Arc::ptr_eq(&self.inner, &other.inner) } } impl fmt::Debug for Unparker { fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result { f.pad("Unparker { .. }") } } impl Clone for Unparker { fn clone(&self) -> Unparker { Unparker { inner: self.inner.clone(), } } } impl From for Waker { fn from(up: Unparker) -> Self { Waker::from(up.inner) } } const EMPTY: usize = 0; const PARKED: usize = 1; const NOTIFIED: usize = 2; struct Inner { state: AtomicUsize, lock: Mutex<()>, cvar: Condvar, } impl Inner { fn park(&self, timeout: Option) -> bool { // If we were previously notified then we consume this notification and return quickly. if self .state .compare_exchange(NOTIFIED, EMPTY, SeqCst, SeqCst) .is_ok() { return true; } // If the timeout is zero, then there is no need to actually block. if let Some(dur) = timeout { if dur == Duration::from_millis(0) { return false; } } // Otherwise we need to coordinate going to sleep. let mut m = self.lock.lock().unwrap(); match self.state.compare_exchange(EMPTY, PARKED, SeqCst, SeqCst) { Ok(_) => {} // Consume this notification to avoid spurious wakeups in the next park. Err(NOTIFIED) => { // We must read `state` here, even though we know it will be `NOTIFIED`. This is // because `unpark` may have been called again since we read `NOTIFIED` in the // `compare_exchange` above. We must perform an acquire operation that synchronizes // with that `unpark` to observe any writes it made before the call to `unpark`. To // do that we must read from the write it made to `state`. let old = self.state.swap(EMPTY, SeqCst); assert_eq!(old, NOTIFIED, "park state changed unexpectedly"); return true; } Err(n) => panic!("inconsistent park_timeout state: {}", n), } match timeout { None => { loop { // Block the current thread on the conditional variable. m = self.cvar.wait(m).unwrap(); if self .state .compare_exchange(NOTIFIED, EMPTY, SeqCst, SeqCst) .is_ok() { // got a notification return true; } } } Some(timeout) => { #[cfg(not(loom))] { // Wait with a timeout, and if we spuriously wake up or otherwise wake up from a // notification we just want to unconditionally set `state` back to `EMPTY`, either // consuming a notification or un-flagging ourselves as parked. let (_m, _result) = self.cvar.wait_timeout(m, timeout).unwrap(); match self.state.swap(EMPTY, SeqCst) { NOTIFIED => true, // got a notification PARKED => false, // no notification n => panic!("inconsistent park_timeout state: {}", n), } } #[cfg(loom)] { let _ = timeout; panic!("park_timeout is not supported under loom"); } } } } pub fn unpark(&self) -> bool { // To ensure the unparked thread will observe any writes we made before this call, we must // perform a release operation that `park` can synchronize with. To do that we must write // `NOTIFIED` even if `state` is already `NOTIFIED`. That is why this must be a swap rather // than a compare-and-swap that returns if it reads `NOTIFIED` on failure. match self.state.swap(NOTIFIED, SeqCst) { EMPTY => return true, // no one was waiting NOTIFIED => return false, // already unparked PARKED => {} // gotta go wake someone up _ => panic!("inconsistent state in unpark"), } // There is a period between when the parked thread sets `state` to `PARKED` (or last // checked `state` in the case of a spurious wakeup) and when it actually waits on `cvar`. // If we were to notify during this period it would be ignored and then when the parked // thread went to sleep it would never wake up. Fortunately, it has `lock` locked at this // stage so we can acquire `lock` to wait until it is ready to receive the notification. // // Releasing `lock` before the call to `notify_one` means that when the parked thread wakes // it doesn't get woken only to have to wait for us to release `lock`. drop(self.lock.lock().unwrap()); self.cvar.notify_one(); true } } impl Wake for Inner { #[inline] fn wake(self: Arc) { self.unpark(); } #[inline] fn wake_by_ref(self: &Arc) { self.unpark(); } } parking-2.2.0/tests/loom.rs000064400000000000000000000003071046102023000137360ustar 00000000000000#![cfg(loom)] #[test] fn smoke() { loom::model(|| { let (p, u) = parking::pair(); loom::thread::spawn(move || { p.park(); }); u.unpark(); }); } parking-2.2.0/tests/parking.rs000064400000000000000000000015671046102023000144340ustar 00000000000000use std::thread::sleep; use std::time::Duration; use std::u32; use easy_parallel::Parallel; use parking::Parker; #[test] fn park_timeout_unpark_before() { let p = Parker::new(); for _ in 0..10 { p.unparker().unpark(); p.park_timeout(Duration::from_millis(u32::MAX as u64)); } } #[test] fn park_timeout_unpark_not_called() { let p = Parker::new(); for _ in 0..10 { p.park_timeout(Duration::from_millis(10)); } } #[test] fn park_timeout_unpark_called_other_thread() { for _ in 0..10 { let p = Parker::new(); let u = p.unparker(); Parallel::new() .add(move || { sleep(Duration::from_millis(50)); u.unpark(); }) .add(move || { p.park_timeout(Duration::from_millis(u32::MAX as u64)); }) .run(); } }