spinning_top

A simple spinlock crate based on the abstractions provided by lock_api.

Example

First, import the crate as a dependency in your Cargo.toml. Then you can use it in the following way:

use spinning_top::Spinlock;

fn main() {
    // Wrap some data in a spinlock
    let data = String::from("Hello");
    let spinlock = Spinlock::new(data);
    make_uppercase(&spinlock); // only pass a shared reference
    // We have ownership of the spinlock, so we can extract the data without locking
    // Note: this consumes the spinlock
    let data = spinlock.into_inner();
    assert_eq!(data.as_str(), "HELLO");
}

fn make_uppercase(spinlock: &Spinlock<String>) {
    // Lock the spinlock to get a mutable reference to the data
    let mut locked_data = spinlock.lock();
    assert_eq!(locked_data.as_str(), "Hello");
    locked_data.make_ascii_uppercase();

    // the lock is automatically freed at the end of the scope
}

The nightly Feature

On Rust nightly, the nightly feature of this crate can be enabled to make the Spinlock::new function a const function. This makes the Spinlock type usable in statics:

use spinning_top::Spinlock;

static DATA: Spinlock<u32> = Spinlock::new(0);

fn main() {
    let mut data = DATA.lock();
    *data += 1;
    assert_eq!(*data, 1);
}

License

Licensed under either of

• Apache License, Version 2.0 (LICENSE-APACHE or http://www.apache.org/licenses/LICENSE-2.0)
• MIT license (LICENSE-MIT or http://opensource.org/licenses/MIT)

at your option.

Unless you explicitly state otherwise, any contribution intentionally submitted for inclusion in the work by you, as defined in the Apache-2.0 license, shall be dual licensed as above, without any additional terms or conditions.