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//! Asynchronous tasks. //! //! This module is similar to [`std::thread`], except it uses asynchronous tasks in place of //! threads. //! //! [`std::thread`]: https://doc.rust-lang.org/std/thread/index.html //! //! # Examples //! //! Spawn a task and await its result: //! //! ``` //! # fn main() { async_std::task::block_on(async { //! # //! use async_std::task; //! //! let handle = task::spawn(async { //! 1 + 2 //! }); //! assert_eq!(handle.await, 3); //! # //! # }) } //! ``` #[doc(inline)] pub use std::task::{Context, Poll, Waker}; #[cfg(any(feature = "unstable", feature = "docs"))] #[cfg_attr(feature = "docs", doc(cfg(unstable)))] #[doc(inline)] pub use async_macros::ready; pub use block_on::block_on; pub use builder::Builder; pub use pool::spawn; pub use sleep::sleep; pub use task::{JoinHandle, Task, TaskId}; pub use task_local::{AccessError, LocalKey}; pub use worker::current; mod block_on; mod builder; mod pool; mod sleep; mod sleepers; mod task; mod task_local; mod worker; pub(crate) mod blocking; /// Spawns a blocking task. /// /// The task will be spawned onto a thread pool specifically dedicated to blocking tasks. This /// is useful to prevent long-running synchronous operations from blocking the main futures /// executor. /// /// See also: [`task::block_on`]. /// /// [`task::block_on`]: fn.block_on.html /// /// # Examples /// /// Basic usage: /// /// ``` /// # fn main() { async_std::task::block_on(async { /// # /// use async_std::task; /// /// task::blocking(async { /// println!("long-running task here"); /// }).await; /// # /// # }) } /// ``` // Once this function stabilizes we should merge `blocking::spawn` into this so // all code in our crate uses `task::blocking` too. #[cfg(any(feature = "unstable", feature = "docs"))] #[cfg_attr(feature = "docs", doc(cfg(unstable)))] #[inline] pub fn blocking<F, R>(future: F) -> task::JoinHandle<R> where F: crate::future::Future<Output = R> + Send + 'static, R: Send + 'static, { blocking::spawn(future) }