diff --git a/core/global-io.cpp b/core/global-io.cpp
new file mode 100644
index 0000000..7eb6a56
--- /dev/null
+++ b/core/global-io.cpp
@@ -0,0 +1,54 @@
+/* -*- Mode:C++; c-file-style:"gnu"; indent-tabs-mode:nil; -*- */
+/**
+ * Copyright (c) 2014-2015,  Regents of the University of California,
+ *                           Arizona Board of Regents,
+ *                           Colorado State University,
+ *                           University Pierre & Marie Curie, Sorbonne University,
+ *                           Washington University in St. Louis,
+ *                           Beijing Institute of Technology,
+ *                           The University of Memphis.
+ *
+ * This file is part of NFD (Named Data Networking Forwarding Daemon).
+ * See AUTHORS.md for complete list of NFD authors and contributors.
+ *
+ * NFD is free software: you can redistribute it and/or modify it under the terms
+ * of the GNU General Public License as published by the Free Software Foundation,
+ * either version 3 of the License, or (at your option) any later version.
+ *
+ * NFD is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY;
+ * without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR
+ * PURPOSE.  See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with
+ * NFD, e.g., in COPYING.md file.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#include "global-io.hpp"
+#include "scheduler.hpp"
+
+namespace nfd {
+
+namespace detail {
+
+void
+SimulatorIo::post(const std::function<void()>& callback)
+{
+  scheduler::schedule(time::seconds(0), callback);
+}
+
+void
+SimulatorIodispatch(const std::function<void()>& callback)
+{
+  scheduler::schedule(time::seconds(0), callback);
+}
+
+} // namespace detail
+
+detail::SimulatorIo&
+getGlobalIoService()
+{
+  static detail::SimulatorIo io;
+  return io;
+}
+
+} // namespace nfd