spin-sync 0.2.0

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spin-sync is a module providing synchronization primitives using spinlock. ([Wikipedia Spinlock](https://en.wikipedia.org/wiki/Spinlock))

The main features are as follows.

* Declaring public structs `Mutex` , `RwLock` , `Once` , `Barrier` . The interfaces are resembles those of `std::sync` .
* Ensuring safety as much as `std::sync` , including poisoning strategy and marker traits.
* Unlike to `std::sync`, the constructors of the public structs are const; i.e. it is possible to declare
  static `Mutex<T>` as long as T can be build statically.

## How to use

1. Add the following line in dependencies section in your Cargo.toml.

   ```Cargo.toml
   spin-sync = "0.2.0"
   ```

1. Build, test and run your project.

   ```shell
   cargo build
   cargo test
   cargo run
   ```

## Examples

Declare `static spin_sync::Mutex<u64>` variable and update from multi threads.
It is impossible in case of `std::sync::Mutex` .

```
extern crate spin_sync;

use spin_sync::Mutex;
use std::thread;

// Declare static mut Mutex<u64> variable.
static COUNT: Mutex<u64> = Mutex::new(0);

fn main() {
    let num_thread = 10;
    let mut handles = Vec::new();
    
    // Create worker threads to inclement COUNT by 1.
    for _ in 0..10 {
        let handle = thread::spawn(move || {
            let mut count = COUNT.lock().unwrap();
            *count += 1;
        });

        handles.push(handle);
    }

    // Wait for all the workers.
    for handle in handles {
        handle.join().unwrap();
    }

    // Make sure the value is incremented by the worker count.
    let count = COUNT.lock().unwrap();
    assert_eq!(num_thread, *count);
}
```