replace top level mutex with rw lock

src/jack.rs

@@ -43,7 +43,7 @@ pub use ::_jack::{
 };
 
 /// Just run thing with JACK. Returns the activated client.
-pub fn jack_run <T> (name: &str, app: &Arc<Mutex<T>>) -> Usually<DynamicAsyncClient>
+pub fn jack_run <T: Sync> (name: &str, app: &Arc<RwLock<T>>) -> Usually<DynamicAsyncClient>
     where T: Handle + Process + Send + 'static
 {
     let options = ClientOptions::NO_START_SERVER;
@@ -59,7 +59,7 @@ pub fn jack_run <T> (name: &str, app: &Arc<Mutex<T>>) -> Usually<DynamicAsyncCli
         ClosureProcessHandler::new(Box::new({
             let app = app.clone();
             move|c: &Client, s: &ProcessScope|{
-                app.lock().unwrap().process(c, s)
+                app.write().unwrap().process(c, s)
                 //Control::Continue
             }
         }) as BoxedProcessHandler)