commit 8bc2d88dff73ecff8d738c54928aeb78838a4485
Author: jvdp <jvdplas@gmail.com>
Date:   Thu Apr 9 22:16:18 2015 +0200

    monitor: initialize counter on lock to prevent inconsistent state

diff --git a/lib/monitor.rb b/lib/monitor.rb
index 07394b5..e0491ec 100644
--- a/lib/monitor.rb
+++ b/lib/monitor.rb
@@ -170,6 +170,7 @@ module MonitorMixin
         return false
       end
       @mon_owner = Thread.current
+      @mon_count = 0
     end
     @mon_count += 1
     return true
@@ -184,6 +185,7 @@ module MonitorMixin
     if @mon_owner != Thread.current
       @mon_mutex.lock
       @mon_owner = Thread.current
+      @mon_count = 0
     end
     @mon_count += 1
   end