fix(tray): optionally run tray in main event loop enabling support for macOS (#3818)

Co-authored-by: Lukas Senionis <22381748+FrogTheFrog@users.noreply.github.com>

src/main.cpp

@@ -88,6 +88,45 @@ WINAPI BOOL ConsoleCtrlHandler(DWORD type) {
 }
 #endif
 
+#if defined SUNSHINE_TRAY && SUNSHINE_TRAY >= 1
+constexpr bool tray_is_enabled = true;
+#else
+constexpr bool tray_is_enabled = false;
+#endif
+
+void mainThreadLoop(const std::shared_ptr<safe::event_t<bool>> &shutdown_event) {
+  bool run_loop = false;
+
+  // Conditions that would require the main thread event loop
+#ifndef _WIN32
+  run_loop = tray_is_enabled;  // On Windows, tray runs in separate thread, so no main loop needed for tray
+#endif
+
+  if (!run_loop) {
+    BOOST_LOG(info) << "No main thread features enabled, skipping event loop"sv;
+    return;
+  }
+
+  // Main thread event loop
+  BOOST_LOG(info) << "Starting main loop"sv;
+  while (true) {
+    if (shutdown_event->peek()) {
+      BOOST_LOG(info) << "Shutdown event detected, breaking main loop"sv;
+      if (tray_is_enabled) {
+        system_tray::end_tray();
+      }
+      break;
+    }
+
+    if (tray_is_enabled) {
+      system_tray::process_tray_events();
+    }
+
+    // Sleep to avoid busy waiting
+    std::this_thread::sleep_for(std::chrono::milliseconds(50));
+  }
+}
+
 int main(int argc, char *argv[]) {
   lifetime::argv = argv;
 
@@ -157,7 +196,7 @@ int main(int argc, char *argv[]) {
     BOOST_LOG(error) << "Display device session failed to initialize"sv;
   }
 
-#ifdef WIN32
+#ifdef _WIN32
   // Modify relevant NVIDIA control panel settings if the system has corresponding gpu
   if (nvprefs_instance.load()) {
     // Restore global settings to the undo file left by improper termination of sunshine.exe
@@ -246,11 +285,6 @@ int main(int argc, char *argv[]) {
 
   task_pool.start(1);
 
-#if defined SUNSHINE_TRAY && SUNSHINE_TRAY >= 1
-  // create tray thread and detach it
-  system_tray::run_tray();
-#endif
-
   // Create signal handler after logging has been initialized
   auto shutdown_event = mail::man->event<bool>(mail::shutdown);
   on_signal(SIGINT, [&force_shutdown, &display_device_deinit_guard, shutdown_event]() {
@@ -350,7 +384,23 @@ int main(int argc, char *argv[]) {
   }
 #endif
 
-  // Wait for shutdown
+  if (tray_is_enabled) {
+    BOOST_LOG(info) << "Starting system tray"sv;
+#ifdef _WIN32
+    // TODO: Windows has a weird bug where when running as a service and on the first Windows boot,
+    // he tray icon would not appear even though Sunshine is running correctly otherwise.
+    // Restarting the service would allow the icon to appear normally.
+    // For now we will keep the Windows tray icon on a separate thread.
+    // Ideally, we would run the system tray on the main thread for all platforms.
+    system_tray::init_tray_threaded();
+#else
+    system_tray::init_tray();
+#endif
+  }
+
+  mainThreadLoop(shutdown_event);
+
+  // Wait for shutdown, this is not necessary when we're using the main event loop
   shutdown_event->view();
 
   httpThread.join();
@@ -360,17 +410,17 @@ int main(int argc, char *argv[]) {
   task_pool.stop();
   task_pool.join();
 
-  // stop system tray
-#if defined SUNSHINE_TRAY && SUNSHINE_TRAY >= 1
-  system_tray::end_tray();
-#endif
-
-#ifdef WIN32
+#ifdef _WIN32
   // Restore global NVIDIA control panel settings
   if (nvprefs_instance.owning_undo_file() && nvprefs_instance.load()) {
     nvprefs_instance.restore_global_profile();
     nvprefs_instance.unload();
   }
+
+  // Stop the threaded tray if it was started
+  if (tray_is_enabled) {
+    system_tray::end_tray_threaded();
+  }
 #endif
 
   return lifetime::desired_exit_code;