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diff --git a/src/io_object.hpp b/src/io_object.hpp
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+++ b/src/io_object.hpp
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+/*
+    Copyright (c) 2007-2013 Contributors as noted in the AUTHORS file
+
+    This file is part of 0MQ.
+
+    0MQ is free software; you can redistribute it and/or modify it under
+    the terms of the GNU Lesser General Public License as published by
+    the Free Software Foundation; either version 3 of the License, or
+    (at your option) any later version.
+
+    0MQ 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 Lesser General Public License for more details.
+
+    You should have received a copy of the GNU Lesser General Public License
+    along with this program.  If not, see <http://www.gnu.org/licenses/>.
+*/
+
+#ifndef __ZMQ_IO_OBJECT_HPP_INCLUDED__
+#define __ZMQ_IO_OBJECT_HPP_INCLUDED__
+
+#include <stddef.h>
+
+#include "stdint.hpp"
+#include "poller.hpp"
+#include "i_poll_events.hpp"
+
+namespace zmq
+{
+
+    class io_thread_t;
+
+    //  Simple base class for objects that live in I/O threads.
+    //  It makes communication with the poller object easier and
+    //  makes defining unneeded event handlers unnecessary.
+
+    class io_object_t : public i_poll_events
+    {
+    public:
+
+        io_object_t (zmq::io_thread_t *io_thread_ = NULL);
+        ~io_object_t ();
+
+        //  When migrating an object from one I/O thread to another, first
+        //  unplug it, then migrate it, then plug it to the new thread.
+        void plug (zmq::io_thread_t *io_thread_);
+        void unplug ();
+
+    protected:
+
+        typedef poller_t::handle_t handle_t;
+
+        //  Methods to access underlying poller object.
+        handle_t add_fd (fd_t fd_);
+        void rm_fd (handle_t handle_);
+        void set_pollin (handle_t handle_);
+        void reset_pollin (handle_t handle_);
+        void set_pollout (handle_t handle_);
+        void reset_pollout (handle_t handle_);
+        void add_timer (int timout_, int id_);
+        void cancel_timer (int id_);
+
+        //  i_poll_events interface implementation.
+        void in_event ();
+        void out_event ();
+        void timer_event (int id_);
+
+    private:
+
+        poller_t *poller;
+
+        io_object_t (const io_object_t&);
+        const io_object_t &operator = (const io_object_t&);
+    };
+
+}
+
+#endif