listening to variable while transmitting video

[d]

Hi,

I have main function and thread,

the main function get commands from client (works fine) 
and the thread that transmits video fluently to the client (works fine)

I need that the main function will pass th command to the thread with
transmitting video, the thread read that command and react accordingly-
play\ pause.
 
now, after  "gst_element_set_state (pipeline, GST_STATE_PLAYING);"
the thread will start transmitting the video:

  void *thread_function(void * variable) 
   {
      ...
      ...
      ...
     gst_element_set_state (pipeline, GST_STATE_PLAYING);
  
     ....
     ....
     gst_object_unref (bus);
     gst_element_set_state (pipeline, GST_STATE_NULL);
     gst_object_unref (pipeline);
     return 0;

   }


how do I make the thread to listen to some command_variable from the main
*while its transmitting video*?
is the thread "stuck" on the " gst_element_set_state" (like while(1)) ?
the thread suppose to get that command_variable from the main function and
react accordingly.

thanks!




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