How to wait for the pipeline destruction

[Elio Francesconi]

Hi all,
this is my code to close a pipeline:
        if(pPipeline!=NULL)
        {
            gst_element_set_state(pPipeline, GST_STATE_NULL);
            gst_object_unref(pPipeline);
            pPipeline = NULL;
        }

I noticed the pipeline is closed correctly but I need to wait for the pipeline destruction. Which is the best way to do that?
Thanks
Elio
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