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async-std v1.1.0 Release Notes

Release Date: 2019-11-21 // over 4 years ago

  • 📚 API Documentation

    ⏱ This patch introduces a faster scheduler algorithm, Stream::throttle, and stabilizes task::yield_now. Additionally we're introducing several more stream APIs, bringing us to almost complete parity with the standard library.

    Furthermore our path submodule now returns more context in errors. So if opening a file fails, async-std will tell you which file was failed to open, making it easier to write and debug programs.

    Examples

    let start = Instant::now();

let mut s = stream::interval(Duration::from_millis(5))
    .throttle(Duration::from_millis(10))
    .take(2);

s.next().await;
assert!(start.elapsed().as_millis() >= 5);

s.next().await;
assert!(start.elapsed().as_millis() >= 15);

s.next().await;
assert!(start.elapsed().as_millis() >= 25);

    ➕ Added

    • ➕ Added Stream::throttle as "unstable".
    • ➕ Added Stream::count as "unstable".
    • ➕ Added Stream::max as "unstable".
    • ➕ Added Stream::successors as "unstable".
    • ➕ Added Stream::by_ref as "unstable".
    • ➕ Added Stream::partition as "unstable".
    • ➕ Added contextual errors to the path submodule.
    • ➕ Added os::windows::symlink_dir as "unstable".
    • ➕ Added os::windows::symlink_file as "unstable".
    • Stabilized task::yield_now.

    🛠 Fixes

    • 👀 We now ignore seek errors when rolling back failed read calls on File.
    • Fixed a bug where Stream::max_by_key was returning the wrong result.
    • Fixed a bug where Stream::min_by_key was returning the wrong result.

    🔄 Changed

    • 🛠 Applied various fixes to the tutorial.
    • 🛠 Fixed an issue with Clippy.
    • ⚡️ Optimized an internal code generation macro, improving compilation speeds.
    • ✂ Removed an Unpin bound from stream::Once.
    • ✂ Removed various extra internal uses of pin_mut!.
    • Simplified Stream::any and Stream::all's internals.
    • The surf example is now enabled again.
    • 👉 Tweaked some streams internals.
    • ⚡️ Updated futures-timer to 2.0.0, improving compilation speed.
    • ⬆️ Upgraded async-macros to 2.0.0.
    • 🚤 Stream::merge now uses randomized ordering to reduce overall latency.
    • ⏱ The scheduler is now more efficient by keeping a slot for the next task to run. This is similar to Go's scheduler, and Tokio's scheduler.
    • 🛠 Fixed the documentation of the channel types to link back to the channel function.