Crate smol

A small and fast async runtime.

This crate simply re-exports other smaller async crates (see the source).

To use tokio-based libraries with smol, apply the async-compat adapter to futures and I/O types.

Examples

Connect to an HTTP website, make a GET request, and pipe the response to the standard output:

use smol::{io, net, prelude::*, Unblock};

fn main() -> io::Result<()> {
    smol::block_on(async {
        let mut stream = net::TcpStream::connect("example.com:80").await?;
        let req = b"GET / HTTP/1.1\r\nHost: example.com\r\nConnection: close\r\n\r\n";
        stream.write_all(req).await?;

        let mut stdout = Unblock::new(std::io::stdout());
        io::copy(stream, &mut stdout).await?;
        Ok(())
    })
}

There's a lot more in the examples directory.

Modules

channel	An async multi-producer multi-consumer channel.
fs	Async filesystem primitives.
future	Combinators for the Future trait.
io	Tools and combinators for I/O.
lock	Async synchronization primitives.
net	Async networking primitives for TCP/UDP/Unix communication.
prelude	Traits Future, Stream, AsyncRead, AsyncWrite, AsyncBufRead, AsyncSeek, and their extensions.
process	Async interface for working with processes.
stream	Combinators for the Stream trait.

Macros

pin	Pins a variable of type T on the stack and rebinds it as Pin<&mut T>.
ready	Unwraps Poll<T> or returns Pending.

Structs

Async	Async adapter for I/O types.
Executor	An async executor.
LocalExecutor	A thread-local executor.
Task	A spawned task.
Timer	A future that expires at a point in time.
Unblock	Runs blocking I/O on a thread pool.

Functions

block_on	Blocks the current thread on a future, processing I/O events when idle.
spawn	Spawns a task onto the global executor (single-threaded by default).
unblock	Runs blocking code on a thread pool.