libev.patch

diff -u A/ev.c B/ev.c
--- A/ev.c	2010-09-17 19:34:16.000000000 +0100
+++ B/ev.c	2010-09-27 23:19:38.000000000 +0100
@@ -2226,6 +2226,13 @@
     }
 }
 
+ev_tstamp next_waittime  = 0.;
+
+ev_tstamp
+ev_next_waittime() {
+  return next_waittime;
+}
+
 void
 ev_loop (EV_P_ int flags)
 {
@@ -2370,6 +2377,25 @@
 #if EV_MINIMAL < 2
   --loop_depth;
 #endif
+
+  // Compute the next waiting time.
+  ev_tstamp waittime = MAX_BLOCKTIME;
+
+  if (timercnt)
+  {
+    ev_tstamp to = ANHE_at (timers [HEAP0]) - mn_now + backend_fudge;
+    if (waittime > to) waittime = to;
+  }
+
+#if EV_PERIODIC_ENABLE
+  if (periodiccnt)
+  {
+    ev_tstamp to = ANHE_at (periodics [HEAP0]) - ev_rt_now + backend_fudge;
+    if (waittime > to) waittime = to;
+  }
+#endif
+
+  next_waittime = waittime;
 }
 
 void
@@ -2378,6 +2404,16 @@
   loop_done = how;
 }
 
+int ev_backend_fd()
+{
+  return backend_fd;
+}
+
+int ev_backend_changecount()
+{
+  return kqueue_changecnt;
+}
+
 void
 ev_ref (EV_P)
 {
diff -u A/ev.h B/ev.h
--- A/ev.h	2010-09-17 19:34:16.000000000 +0100
+++ B/ev.h	2010-09-27 23:19:46.000000000 +0100
@@ -530,6 +530,10 @@
 void ev_loop (EV_P_ int flags);
 void ev_unloop (EV_P_ int how); /* set to 1 to break out of event loop, set to 2 to break out of all event loops */
 
+int ev_backend_fd();
+int ev_backend_changecount();
+ev_tstamp ev_next_waittime();
+
 /*
  * ref/unref can be used to add or remove a refcount on the mainloop. every watcher
  * keeps one reference. if you have a long-running watcher you never unregister that