vlc_mutex_destroy( &p_instance->event_callback_lock );
if( p_instance->p_event_manager )
libvlc_event_manager_release( p_instance->p_event_manager );
vlc_mutex_destroy( &p_instance->event_callback_lock );
if( p_instance->p_event_manager )
libvlc_event_manager_release( p_instance->p_event_manager );