use GTK-specific GUI lock

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@44245 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

src/gtk/app.cpp

@@ -247,18 +247,12 @@ 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;
 }
 }
@@ -408,6 +402,7 @@ 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);
@@ -562,3 +557,15 @@ void wxApp::SuspendIdleCallback()
         wxAddEmissionHook();
     }
 }
+
+#if wxUSE_THREADS
+void wxMutexGuiEnter()
+{
+    gdk_threads_enter();
+}
+
+void wxMutexGuiLeave()
+{
+    gdk_threads_leave();
+}
+#endif