I/O vs CPU-intensive tasks
As you know now, what you normally write are called non-leaf futures. Let’s take a look at this async block using pseudo-Rust as an example:
let non_leaf = async {
let mut stream = TcpStream::connect("127.0.0.1:3000").await.unwrap();
// request a large dataset
let result = stream.write(get_dataset_request).await.unwrap();
// wait for the dataset
let mut response = vec![];
stream.read(&mut response).await.unwrap();
// do some CPU-intensive analysis on the dataset
let report = analyzer::analyze_data(response).unwrap();
// send the results back
stream.write(report).await.unwrap();
}; I’ve highlighted the points where we yield control to the runtime executor. It’s important to be aware...
