add MutexGuiEnter/Leave to wxAppTraits, integrate native GTK+ GUI locking

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@50757 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

src/gtk/app.cpp

@@ -225,18 +225,12 @@ static GPollFunc wxgs_poll_func;
 extern "C" {
 static gint wxapp_poll_func( GPollFD *ufds, guint nfds, gint timeout )
 {
-    gdk_threads_enter();
-
-    wxMutexGuiLeave();
     g_mainThreadLocked = true;
 
     gint res = (*wxgs_poll_func)(ufds, nfds, timeout);
 
-    wxMutexGuiEnter();
     g_mainThreadLocked = false;
 
-    gdk_threads_leave();
-
     return res;
 }
 }
@@ -356,7 +350,10 @@ bool wxApp::Initialize(int& argc_, wxChar **argv_)
 
 #if wxUSE_THREADS
     if (!g_thread_supported())
+    {
         g_thread_init(NULL);
+        gdk_threads_init();
+    }
 
     wxgs_poll_func = g_main_context_get_poll_func(NULL);
     g_main_context_set_poll_func(NULL, wxapp_poll_func);
@@ -581,3 +578,15 @@ void wxApp::OnAssertFailure(const wxChar *file,
 }
 
 #endif // __WXDEBUG__
+
+#if wxUSE_THREADS
+void wxGUIAppTraits::MutexGuiEnter()
+{
+    gdk_threads_enter();
+}
+
+void wxGUIAppTraits::MutexGuiLeave()
+{
+    gdk_threads_leave();
+}
+#endif // wxUSE_THREADS