Refresh Gtk::Label by set_text() ?

[radone]

In separate thread of my Gtk app I am sending data and I need to display them in Gtk::Label by set_text(char*) method.
How can I refresh its content?
--------------------- My unsuccessfull tryout:
I have tryed this:

while( Gtk::Main::events_pending() )
         Gtk::Main::iteration (false); 

But got this error messages:

(lt-rtprtcp:10721): GLib-WARNING **: g_main_context_prepare(): main loop already active in another thread
(lt-rtprtcp:10721): GLib-WARNING **: g_main_context_prepare(): main loop already active in another thread
(lt-rtprtcp:10721): GLib-WARNING **: g_main_context_prepare(): main loop already active in another thread
(lt-rtprtcp:10721): GLib-WARNING **: g_main_context_prepare(): main loop already active in another thread
(lt-rtprtcp:10721): GLib-WARNING **: g_main_context_prepare(): main loop already active in another thread
Xlib: unexpected async reply (sequence 0xa0e7)!
GLib-ERROR **: file gmain.c: line 1880 (g_main_dispatch): assertion failed: (source)


And is terminated :-/ 

Thanks in advance.

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