Let shaper cope with low resolution system clock

We no longer rely on getting unique values from clock source, so we need
to handle cope with systems which does not have a microsecond resolution
on system clock (such as MS Windows)

1 files changed, 5 insertions, 1 deletions

diff --git a/src/shaper.erl b/src/shaper.erl
index a136c2130..eb82b8faa 100644
--- a/src/shaper.erl
+++ b/src/shaper.erl
@@ -124,9 +124,13 @@ update(#maxrate{} = State, Size) ->
 	       true -> 0
 	    end,
     NextNow = p1_time_compat:system_time(micro_seconds) + Pause * 1000,
+    Div = case NextNow - State#maxrate.lasttime of
+        0 -> 1;
+        V -> V
+    end,
     {State#maxrate{lastrate =
 		       (State#maxrate.lastrate +
-			  1000000 * Size / (NextNow - State#maxrate.lasttime))
+			  1000000 * Size / Div)
 			 / 2,
 		   lasttime = NextNow},
      Pause}.