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>
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// Copyright 2016 Amanieu d'Antras // // Licensed under the Apache License, Version 2.0, <LICENSE-APACHE or // http://apache.org/licenses/LICENSE-2.0> or the MIT license <LICENSE-MIT or // http://opensource.org/licenses/MIT>, at your option. This file may not be // copied, modified, or distributed except according to those terms. //! This library exposes a low-level API for creating your own efficient //! synchronization primitives. //! //! # The parking lot //! //! To keep synchronization primitives small, all thread queuing and suspending //! functionality is offloaded to the *parking lot*. The idea behind this is based //! on the Webkit [`WTF::ParkingLot`](https://webkit.org/blog/6161/locking-in-webkit/) //! class, which essentially consists of a hash table mapping of lock addresses //! to queues of parked (sleeping) threads. The Webkit parking lot was itself //! inspired by Linux [futexes](http://man7.org/linux/man-pages/man2/futex.2.html), //! but it is more powerful since it allows invoking callbacks while holding a //! queue lock. //! //! There are two main operations that can be performed on the parking lot: //! //! - *Parking* refers to suspending the thread while simultaneously enqueuing it //! on a queue keyed by some address. //! - *Unparking* refers to dequeuing a thread from a queue keyed by some address //! and resuming it. //! //! See the documentation of the individual functions for more details. //! //! # Building custom synchronization primitives //! //! Building custom synchronization primitives is very simple since the parking //! lot takes care of all the hard parts for you. A simple example for a //! custom primitive would be to integrate a `Mutex` inside another data type. //! Since a mutex only requires 2 bits, it can share space with other data. //! For example, one could create an `ArcMutex` type that combines the atomic //! reference count and the two mutex bits in the same atomic word. #![warn(missing_docs)] #![warn(rust_2018_idioms)] #![cfg_attr( all(target_env = "sgx", target_vendor = "fortanix"), feature(sgx_platform) )] #![cfg_attr( all( feature = "nightly", target_arch = "wasm32", target_feature = "atomics" ), feature(checked_duration_since, stdsimd) )] #![cfg_attr( all(feature = "nightly", target_os = "cloudabi",), feature(thread_local, checked_duration_since) )] mod parking_lot; mod spinwait; mod thread_parker; mod util; mod word_lock; pub use self::parking_lot::deadlock; pub use self::parking_lot::{park, unpark_all, unpark_filter, unpark_one, unpark_requeue}; pub use self::parking_lot::{ FilterOp, ParkResult, ParkToken, RequeueOp, UnparkResult, UnparkToken, }; pub use self::parking_lot::{DEFAULT_PARK_TOKEN, DEFAULT_UNPARK_TOKEN}; pub use self::spinwait::SpinWait;