1 files changed, 16 insertions, 2 deletions
diff --git a/sysdep/unix/timer.h b/sysdep/unix/timer.h
index a20df483..a788ae27 100644
--- a/sysdep/unix/timer.h
+++ b/sysdep/unix/timer.h
@@ -30,6 +30,22 @@ void tm_start(timer *, unsigned after);
 void tm_stop(timer *);
 void tm_dump_all(void);
 
+extern bird_clock_t now; 		/* Relative, monotonic time in seconds */
+extern bird_clock_t now_real;		/* Time in seconds since fixed known epoch */
+
+static inline bird_clock_t
+tm_remains(timer *t)
+{
+  return t->expires ? t->expires - now : 0;
+}
+
+static inline void
+tm_start_max(timer *t, unsigned after)
+{
+  bird_clock_t rem = tm_remains(t);
+  tm_start(t, (rem > after) ? rem : after);
+}
+
 static inline timer *
 tm_new_set(pool *p, void (*hook)(struct timer *), void *data, unsigned rand, unsigned rec)
 {
@@ -41,8 +57,6 @@ tm_new_set(pool *p, void (*hook)(struct timer *), void *data, unsigned rand, uns
   return t;
 }
 
-extern bird_clock_t now; 		/* Relative, monotonic time in seconds */
-extern bird_clock_t now_real;		/* Time in seconds since fixed known epoch */
 
 struct timeformat {
   char *fmt1, *fmt2;