ui_application_t - we never use run except for Qt, so remove this

and move the code to frontend.c - also add a boolean variable to
ui_application_t to indicate whether an app is about to exit

frontend/frontend.c

@@ -164,8 +164,26 @@ int rarch_main(int argc, char *argv[], void *data)
       const ui_application_t *ui_application = 
          ui_companion_driver_get_qt_application_ptr();
       if (ui_application)
-         ui_application->run(data);
+      {
+         do
+         {
+            unsigned sleep_ms = 0;
+            int ret = runloop_iterate(&sleep_ms);
+
+            if (ret == 1 && sleep_ms > 0)
+               retro_sleep(sleep_ms);
+
+            task_queue_check();
+
+            if (ret == -1 || ui_application->exiting)
+            {
+               ui_application->quit();
+               break;
+            }
+         }while(1);
+      }
    }
+   main_exit(data);
 #endif
 
    return 0;

ui/drivers/cocoa/ui_cocoa_application.m

@@ -24,7 +24,6 @@
 #include "cocoa_common.h"
 #include "../../ui_companion_driver.h"
 
-
 static void* ui_application_cocoa_initialize(void)
 {
    return NULL;
@@ -55,16 +54,12 @@ static void ui_application_cocoa_process_events(void)
     }
 }
 
-static void ui_application_cocoa_run(void *args)
-{
-   (void)args;
-}
-
 ui_application_t ui_application_cocoa = {
    ui_application_cocoa_initialize,
    ui_application_cocoa_pending_events,
    ui_application_cocoa_process_events,
-   ui_application_cocoa_run,
    NULL,
+   NULL,
+   false,
    "cocoa"
 };

ui/drivers/null/ui_null_application.c

@@ -35,16 +35,11 @@ static void ui_application_null_process_events(void)
 {
 }
 
-static void ui_application_null_run(void *args)
-{
-   (void)args;
-}
-
 ui_application_t ui_application_null = {
    ui_application_null_initialize,
    ui_application_null_pending_events,
    ui_application_null_process_events,
-   ui_application_null_run,
    NULL,
+   false,
    "null"
 };

ui/drivers/qt/ui_qt_application.cpp

@@ -40,7 +40,6 @@ extern "C" {
 
 static AppHandler *appHandler;
 static ui_application_qt_t ui_application;
-static bool app_exiting = false;
 
 /* these must last for the lifetime of the QApplication */
 static int app_argc = 1;
@@ -78,7 +77,7 @@ AppHandler::~AppHandler()
 
 void AppHandler::exit()
 {
-   app_exiting = true;
+   ui_application_qt.exiting = true;
 
    if (qApp)
       qApp->closeAllWindows();
@@ -86,7 +85,7 @@ void AppHandler::exit()
 
 bool AppHandler::isExiting() const
 {
-   return app_exiting;
+   return ui_application_qt.exiting;
 }
 
 void AppHandler::onLastWindowClosed()
@@ -151,30 +150,6 @@ static void ui_application_qt_quit(void)
       appHandler->exit();
 }
 
-static void ui_application_qt_run(void *args)
-{
-#ifdef HAVE_MAIN
-   do
-   {
-      unsigned sleep_ms = 0;
-      int ret = runloop_iterate(&sleep_ms);
-
-      if (ret == 1 && sleep_ms > 0)
-         retro_sleep(sleep_ms);
-
-      task_queue_check();
-
-      if (ret == -1 || app_exiting)
-      {
-         ui_application_qt_quit();
-         break;
-      }
-   }while(1);
-
-   main_exit(args);
-#endif
-}
-
 #ifdef HAVE_MAIN
 #if defined(__cplusplus) && !defined(CXX_BUILD)
 extern "C"
@@ -189,7 +164,7 @@ ui_application_t ui_application_qt = {
    ui_application_qt_initialize,
    ui_application_qt_pending_events,
    ui_application_qt_process_events,
-   ui_application_qt_run,
    ui_application_qt_quit,
+   false,
    "qt"
 };

ui/drivers/win32/ui_win32_application.c

@@ -48,16 +48,11 @@ static void ui_application_win32_process_events(void)
    }
 }
 
-static void ui_application_win32_run(void *args)
-{
-   (void)args;
-}
-
 ui_application_t ui_application_win32 = {
    ui_application_win32_initialize,
    ui_application_win32_pending_events,
    ui_application_win32_process_events,
-   ui_application_win32_run,
    NULL,
+   false,
    "win32"
 };

ui/ui_companion_driver.h

@@ -107,8 +107,8 @@ typedef struct ui_application
    void* (*initialize)(void);
    bool (*pending_events)(void);
    void (*process_events)(void);
-   void (*run)(void *args);
    void (*quit)(void);
+   bool exiting;
    const char *ident;
 } ui_application_t;