RusPiRo Lock crate

Simple to use abstractions on low level atomic locks: - Spinlock: blocking lock to secure cross core mutual exclusive access (requires a configured MMU on Raspberry Pi) - Semaphore: counting blocking or nonblocking lock to secure cross core exclusive access - DataLock: data container guarded by a nonblocking atomic lock to secure cross core mutual exclusive access

Usage

To use this crate simply add the dependency to your Cargo.toml file: [dependencies] ruspiro-lock = "0.2"

Once done the definition and usage of the locks is as follows:

Using a Spinlock to ensure exclusive access: ``` use ruspiro_lock::*;

static SPIN: Spinlock = Spinlock::new();

fn main() { SPIN.aquire(); // following code is only executed if the lock could be aquired, the executing core pause till then let _ = 10 + 3; SPIN.release(); } ```

Using a Semaphore to specify how often specific access is valid: ``` use ruspriro_lock::*;

static mut SEMA: Semaphore = Semaphore::new(1);

fn main() { unsafe { // unsafe necessary as accessing mut static's is unsafe if SEMA.trydown().isok() { // we gained access to the semaphore, do something let _ = 20 /4; SEMA.up(); } } } ```

Using data container with atmic lock guard: ``` use ruspiro_lock::*;

static DATA: DataLock = DataLock::new(0);

fn main() { if let Some(mut data) = DATA.trylock() { *data = 20; } // once the data goes ot of scope the lock will be released if let Some(data) = DATA.trylock() { println!("data: {}", *data);

    // another lock should fail inside this scope
    assert_eq!(DATA.try_lock(), None);
}

} ```

License

Licensed under Apache License, Version 2.0, (LICENSE or http://www.apache.org/licenses/LICENSE-2.0)