[gst-embedded] gst_bus_add_watch without _main_loop_run (loop)

[宋江山]

I would like to know that can I get the "end of stream" event (or a
signal?) without using the mainloop?
I used:
 gst_bus_add_watch (bus, my_bus_callback, NULL);
 to add a watch to catch the "end of stream" signal. But it seems
my_bus_callback not been called at all.
Maybe because I did not use
  g_main_loop_run (loop);
  because I have something else to do with my program.

What should  I do?
Should I create a thread and run  g_main_loop_run (loop)  or
this loop is not needed ?
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