the number of pending clock notifications to wait for
the timeout in milliseconds
Address of a #GList pointer variable to store the list of pending #GstClockIDs that expired, or null
a gboolean true if the waits have been registered, false if not. (Could be that it timed out waiting or that more waits than waits was found)
Blocks until at least count clock notifications have been requested from test_clock, or the timeout expires.
MT safe.