lib: add thread_add_timer_tv (struct timeval)

Another zoo extension, this adds a timer scheduling function that takes
a struct timeval argument (which is actually what the wrappers boil down
to, yet it's not exposed...)

Signed-off-by: David Lamparter <equinox@opensourcerouting.org>
Signed-off-by: David Lamparter <equinox@opensourcerouting.org>
diff --git a/lib/thread.c b/lib/thread.c
index 6fcddd7..39e79ad 100644
--- a/lib/thread.c
+++ b/lib/thread.c
@@ -896,6 +896,17 @@
                                             arg, &trel, debugargpass);
 }
 
+/* Add timer event thread with "millisecond" resolution */
+struct thread *
+funcname_thread_add_timer_tv (struct thread_master *m,
+                              int (*func) (struct thread *),
+                              void *arg, struct timeval *tv,
+                              debugargdef)
+{
+  return funcname_thread_add_timer_timeval (m, func, THREAD_TIMER,
+                                            arg, tv, debugargpass);
+}
+
 /* Add a background thread, with an optional millisec delay */
 struct thread *
 funcname_thread_add_background (struct thread_master *m,