single-instance
===

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single-instance provides a single API to check if there are any other running instance. 

## Detail
On windows, init `SingleInstance` will create a mutex named by given `&str` then check error code by calling `GetLastError`. On linux init will bind abstract unix domain socket with given name . On macos, init will create or open a file which path is given `&str`, then call `flock` to apply an advisory lock on the open file.

```toml
[dependencies]
single-instance = "0.3"
```

### Examples
```rust
extern crate single_instance;

use single_instance::SingleInstance;

fn main() {
    {
        let instance_a = SingleInstance::new("whatever").unwrap();
        assert!(instance_a.is_single());
        let instance_b = SingleInstance::new("whatever").unwrap();
        assert!(!instance_b.is_single());
    }
    let instance_c = SingleInstance::new("whatever").unwrap();
    assert!(instance_c.is_single());
}
```