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45 lines
1.0 KiB
Rust
45 lines
1.0 KiB
Rust
use std::future::Future;
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use crate::task::Builder;
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/// Spawns a task and blocks the current thread on its result.
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///
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/// Calling this function is similar to [spawning] a thread and immediately [joining] it, except an
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/// asynchronous task will be spawned.
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///
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/// See also: [`task::spawn_blocking`].
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///
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/// [`task::spawn_blocking`]: fn.spawn_blocking.html
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///
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/// [spawning]: https://doc.rust-lang.org/std/thread/fn.spawn.html
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/// [joining]: https://doc.rust-lang.org/std/thread/struct.JoinHandle.html#method.join
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///
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/// # Examples
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///
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/// ```no_run
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/// use async_std::task;
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///
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/// fn main() {
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/// task::block_on(async {
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/// println!("Hello, world!");
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/// })
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/// }
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/// ```
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#[cfg(not(target_os = "unknown"))]
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pub fn block_on<F, T>(future: F) -> T
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where
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F: Future<Output = T>,
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{
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Builder::new().blocking(future)
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}
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/// Spawns a task and waits for it to finish.
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#[cfg(target_os = "unknown")]
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pub fn block_on<F, T>(future: F)
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where
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F: Future<Output = T> + 'static,
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T: 'static,
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{
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Builder::new().local(future).unwrap();
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}
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