+void pa_sink_invalidate_requested_latency(pa_sink *s, pa_bool_t dynamic);
+
+pa_usec_t pa_sink_get_latency_within_thread(pa_sink *s);
+
+pa_device_port *pa_device_port_new(const char *name, const char *description, size_t extra);
+void pa_device_port_free(pa_device_port *p);
+
+/* Verify that we called in IO context (aka 'thread context), or that
+ * the sink is not yet set up, i.e. the thread not set up yet. See
+ * pa_assert_io_context() in thread-mq.h for more information. */
+#define pa_sink_assert_io_context(s) \
+ pa_assert(pa_thread_mq_get() || !PA_SINK_IS_LINKED((s)->state))