poll: Warn if the return value of gst_poll_read_control() is unused

This might fail even under correct usage, e.g. if read_control() is called
from another thread before write_control() finished in another. It has to be
retried then, or other measures have to be taken, depending on how it is used
by the surrounding code.

https://bugzilla.gnome.org/show_bug.cgi?id=750397

diff --git a/gst/gstpoll.h b/gst/gstpoll.h
index 8bf64fd58444d58b63b8f4dbc6f47ffc6bfa0c1a..ef6dceaf2cdda9b51ead7e107fdb53c7edde543b 100644 (file)
--- a/gst/gstpoll.h
+++ b/gst/gstpoll.h
@@ -88,7 +88,7 @@ void            gst_poll_restart          (GstPoll *set);
 void            gst_poll_set_flushing     (GstPoll *set, gboolean flushing);
 
 gboolean        gst_poll_write_control    (GstPoll *set);
-gboolean        gst_poll_read_control     (GstPoll *set);
+gboolean        gst_poll_read_control     (GstPoll *set) G_GNUC_WARN_UNUSED_RESULT;
 
 G_END_DECLS