jack device mutex -> rwlock

src/jack/device.rs

@@ -5,7 +5,7 @@ pub struct JackDevice {
     /// The active JACK client of this device.
     pub client: DynamicAsyncClient,
     /// The device state, encapsulated for sharing between threads.
-    pub state:  Arc<Mutex<Box<dyn Device>>>,
+    pub state:  Arc<RwLock<Box<dyn Device>>>,
     /// Unowned copies of the device's JACK ports, for connecting to the device.
     /// The "real" readable/writable `Port`s are owned by the `state`.
     pub ports:  UnownedJackPorts,
@@ -22,8 +22,12 @@ ports!(JackDevice {
 });
 impl JackDevice {
     /// Returns a locked mutex of the state's contents.
-    pub fn state (&self) -> MutexGuard<Box<dyn Device>> {
-        self.state.lock().unwrap()
+    pub fn state (&self) -> LockResult<RwLockReadGuard<Box<dyn Device>>> {
+        self.state.read()
+    }
+    /// Returns a locked mutex of the state's contents.
+    pub fn state_mut (&self) -> LockResult<RwLockWriteGuard<Box<dyn Device>>> {
+        self.state.write()
     }
     pub fn connect_midi_in (&self, index: usize, port: &Port<Unowned>) -> Usually<()> {
         Ok(self.client.as_client().connect_ports(port, self.midi_ins()?[index])?)

src/jack/factory.rs

@@ -41,7 +41,7 @@ impl Jack {
             .map(|p|Ok(p.name()?)).collect::<Usually<Vec<_>>>()?;
         let audio_ins = owned_ports.audio_ins.values()
             .map(|p|Ok(p.name()?)).collect::<Usually<Vec<_>>>()?;
-        let state = Arc::new(Mutex::new(state(owned_ports) as Box<dyn Device>));
+        let state = Arc::new(RwLock::new(state(owned_ports) as Box<dyn Device>));
         let client = self.client.activate_async(
             Notifications(Box::new({
                 let _state = state.clone();
@@ -53,7 +53,7 @@ impl Jack {
             ClosureProcessHandler::new(Box::new({
                 let state = state.clone();
                 move|c: &Client, s: &ProcessScope|{
-                    state.lock().unwrap().process(c, s)
+                    state.write().unwrap().process(c, s)
                 }
             }) as BoxedProcessHandler)
         )?;

src/model/track.rs

@@ -53,17 +53,17 @@ impl Track {
             device:       0,
         })
     }
-    pub fn device (&self) -> Option<MutexGuard<Box<dyn Device>>> {
+    pub fn device (&self) -> Option<RwLockReadGuard<Box<dyn Device>>> {
         self.get_device(self.device)
     }
-    pub fn first_device (&self) -> Option<MutexGuard<Box<dyn Device>>> {
+    pub fn first_device (&self) -> Option<RwLockReadGuard<Box<dyn Device>>> {
         self.get_device(0)
     }
-    pub fn last_device (&self) -> Option<MutexGuard<Box<dyn Device>>> {
+    pub fn last_device (&self) -> Option<RwLockReadGuard<Box<dyn Device>>> {
         self.get_device(self.devices.len().saturating_sub(1))
     }
-    pub fn get_device (&self, i: usize) -> Option<MutexGuard<Box<dyn Device>>> {
-        self.devices.get(i).map(|d|d.state.lock().unwrap())
+    pub fn get_device (&self, i: usize) -> Option<RwLockReadGuard<Box<dyn Device>>> {
+        self.devices.get(i).map(|d|d.state.read().unwrap())
     }
     pub fn add_device (&mut self, device: JackDevice) -> Usually<&mut JackDevice> {
         self.devices.push(device);

src/view/chain.rs

@@ -62,7 +62,7 @@ impl<'a> ChainView<'a> {
                 //y2 = y2 + 1;
             //}
             let width = width.saturating_sub(x).saturating_sub(x2);
-            let frame = device.state.lock().unwrap()
+            let frame = device.state.read().unwrap()
                 .render(buf, Rect { x: x + x2, y, width, height })?;
             let style = if i == track.device {
                 Some(if self.focused {
@@ -103,12 +103,12 @@ impl<'a> ChainView<'a> {
         let mut w = 0u16;
         let mut frames = vec![];
         let track = self.track.as_ref().unwrap();
-        for (i, device) in track.devices.iter().enumerate() {
+        for (_i, device) in track.devices.iter().enumerate() {
             //let midi_ins    = device.midi_ins()?;
             //let midi_outs   = device.midi_outs()?;
             //let audio_ins   = device.audio_ins()?;
             //let audio_outs  = device.audio_outs()?;
-            let device      = device.state.lock().unwrap();
+            let device      = device.state.read().unwrap();
             //let style_midi  = Style::default().black().bold().on_green();
             //let style_audio = Style::default().black().bold().on_red();
             //y = y + midi_ins.len() as u16;