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docs: mention blocking thread timeout in src/lib.rs (#3253)

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Sylvain Kerkour 2020-12-13 16:24:16 +01:00 committed by GitHub
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tokio/src/lib.rs
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@ -173,16 +173,18 @@
//! combat this, Tokio provides two kinds of threads: Core threads and blocking
//! threads. The core threads are where all asynchronous code runs, and Tokio
//! will by default spawn one for each CPU core. The blocking threads are
//! spawned on demand, and can be used to run blocking code that would otherwise
//! block other tasks from running. Since it is not possible for Tokio to swap
//! out blocking tasks, like it can do with asynchronous code, the upper limit
//! on the number of blocking threads is very large. These limits can be
//! configured on the [`Builder`].
//! spawned on demand, can be used to run blocking code that would otherwise
//! block other tasks from running and are kept alive when not used for a certain
//! amount of time which can be configured with [`thread_keep_alive`].
//! Since it is not possible for Tokio to swap out blocking tasks, like it
//! can do with asynchronous code, the upper limit on the number of blocking
//! threads is very large. These limits can be configured on the [`Builder`].
//!
//! To spawn a blocking task, you should use the [`spawn_blocking`] function.
//!
//! [`Builder`]: crate::runtime::Builder
//! [`spawn_blocking`]: crate::task::spawn_blocking()
//! [`thread_keep_alive`]: crate::runtime::Builder::thread_keep_alive()
//!
//! ```
//! #[tokio::main]