Decouple the update thread from widgets

src/MainWindow.vala

@@ -91,10 +91,10 @@ public class Monitor.MainWindow : Gtk.ApplicationWindow {
             search_revealer.reveal_child = stack.visible_child == process_view;
         });
 
-        new Thread<void> ("upd", () => {
-            Timeout.add_seconds (MonitorApp.settings.get_int ("update-time"), () => {
-                process_view.update ();
+        var process_manager = ProcessManager.get_default ();
 
+        Timeout.add_seconds (MonitorApp.settings.get_int ("update-time"), () => {
+            process_manager.update ();
                 Idle.add (() => {
                     system_view.update ();
                     dbusserver.indicator_state (MonitorApp.settings.get_boolean ("indicator-state"));
@@ -103,8 +103,7 @@ public class Monitor.MainWindow : Gtk.ApplicationWindow {
                     dbusserver.update (res);
                     return false;
                 });
-                return true;
-            });
+            return true;
         });
 
         dbusserver.indicator_state (MonitorApp.settings.get_boolean ("indicator-state"));

src/Managers/ProcessManager.vala

@@ -4,7 +4,7 @@
  */
 
 namespace Monitor {
-    public class ProcessManager {
+    public class ProcessManager : GLib.Object {
         private static GLib.Once<ProcessManager> instance;
         public static unowned ProcessManager get_default () {
             return instance.once (() => { return new ProcessManager (); });
@@ -33,7 +33,7 @@ namespace Monitor {
             apps_info_list = new Gee.HashMap<string, AppInfo> ();
 
             populate_apps_info ();
-            update_processes.begin ();
+            update ();
         }
 
         public void populate_apps_info () {
@@ -102,7 +102,7 @@ namespace Monitor {
         /**
          * Gets all new process and adds them
          */
-        public async void update_processes () {
+        public void update_processes () {
             /* CPU */
             GTop.Cpu cpu_data;
             GTop.get_cpu (out cpu_data);
@@ -158,6 +158,18 @@ namespace Monitor {
 
         }
 
+        public void update () {
+            new Thread<bool> ("update-processes", () => {
+                Idle.add (() => {
+                    update_processes ();
+                    return false;
+                });
+                return true;
+            });
+            /* emit the updated signal so that subscribers can update */
+            updated ();
+        }
+
         /** Sets name and icon for a process that is a Flatpak app and its children. */
         private void set_flatpak_name_icon (Process process, GLib.Icon icon, string name) {
             process.application_name = name;

src/Views/ProcessView/ProcessView.vala

@@ -27,6 +27,8 @@ public class Monitor.ProcessView : Granite.Bin {
             visible = false,
         };
 
+        treeview_model.process_manager.updated.connect (process_info_view.update);
+
         var paned = new Gtk.Paned (HORIZONTAL) {
             start_child = process_tree_view,
             end_child = process_info_view,
@@ -132,17 +134,4 @@ public class Monitor.ProcessView : Granite.Bin {
         kill_action.set_enabled (process.uid == Posix.getuid ());
     }
 
-    public void update () {
-        new Thread<bool> ("update-processes", () => {
-            Idle.add (() => {
-                process_info_view.update ();
-                treeview_model.process_manager.update_processes.begin ();
-
-                return false;
-            });
-            return true;
-        });
-
-    }
-
 }