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)

diff --git a/src/shaper.erl b/src/shaper.erl
index a136c2130d70dfb470588fe26b4101a8ce3e38ec..eb82b8faabed28d1942b415f07bf3a8ba2eaf47c 100644 (file)
--- 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}.