[gst-devel] realvideodec element blocked when close_library (in transition of NULL to READY), why?

[wuzw]

hi all:
    I wrote my gst app which used realvideodec element like this( ignored some non-significant code):

main()
{
    ........
    pthread_creat(&my_thread, null, create_pipe_func, null);

    while(1)
    {
        c = getchar();

        if(c = 'b')
        {
            sleep(10);
        }
    }
    
}

create_pipe_func()
{
     loop = g_main_loop_new(null, false);
     pipeline = _create_pipeline();//make all element and link them, set pad-added callback for delayed link to realvideodec sink pad
     gst_element_set_state(pipeline, GST_STATE_PLAYING);

     g_mainn_loop_run(loop);
}

my pipeline is like this:
filesrc --> rmdemux --> realvideodec --> fakesink

my problem is:

I use the app to play rv4 file, and stream thread blocked on close_library().
gst log like this(sorry, I can not copy and paste for some reason, so i type some significant logs):
------------------------------------------------------------------------------------------------
gstelement.c:2496:gst_element_set_state_func:<realvideodec0> final: set state from NULL to READY
gstrealvideodec.c:456:open_library:<realvideodec0> Attempting to open shared library for real video version 2
....
gstrealvideodec.c:557:close_library:<realvideodec0> closing library module
gstrealvideodec.c:456:open_library:<realvideodec0> Attempting to open shared library for real video version 3
....
gstrealvideodec.c:557:close_library:<realvideodec0> closing library module
------------------------------------------------------------------------------------------------

no more things logged. I added some print to glib source code and found that dlclose() blocked.

if  i input 'b' now , stream tread unblocked and went on correctly.




If my code like :
main()
{
    ........
    create_pipe_func();

        
}

create_pipe_func()
{
     loop = g_main_loop_new(null, false);
     pipeline = _create_pipeline();//make all element and link them, set pad-added callback for delayed link to realvideodec sink pad
     gst_element_set_state(pipeline, GST_STATE_PLAYING);

     g_mainn_loop_run(loop);
}

every thing is ok. 
why? 











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