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diff --git a/src/i_poller.hpp b/src/i_poller.hpp
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+++ b/src/i_poller.hpp
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+/*
+    Copyright (c) 2007-2009 FastMQ Inc.
+
+    This file is part of 0MQ.
+
+    0MQ is free software; you can redistribute it and/or modify it under
+    the terms of the Lesser GNU 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
+    Lesser GNU General Public License for more details.
+
+    You should have received a copy of the Lesser GNU General Public License
+    along with this program.  If not, see <http://www.gnu.org/licenses/>.
+*/
+
+#ifndef __ZS_I_POLLER_HPP_INCLUDED__
+#define __ZS_I_POLLER_HPP_INCLUDED__
+
+#include "fd.hpp"
+
+namespace zs
+{
+
+    union handle_t
+    {
+        fd_t fd;
+        void *ptr;
+    };
+
+    //  Virtual interface to be used when polling on file descriptors.
+
+    struct i_poller
+    {
+        virtual ~i_poller () {};
+
+        //  Add file descriptor to the polling set. Return handle
+        //  representing the descriptor. 'events' interface will be used
+        //  to invoke callback functions when event occurs.
+        virtual handle_t add_fd (fd_t fd_, struct i_poll_events *events_) = 0;
+
+        //  Remove file descriptor identified by handle from the polling set.
+        virtual void rm_fd (handle_t handle_) = 0;
+
+        //  Start polling for input from socket.
+        virtual void set_pollin (handle_t handle_) = 0;
+
+        //  Stop polling for input from socket.
+        virtual void reset_pollin (handle_t handle_) = 0;
+
+        //  Start polling for availability of the socket for writing.
+        virtual void set_pollout (handle_t handle_) = 0;
+
+        //  Stop polling for availability of the socket for writing.
+        virtual void reset_pollout (handle_t handle_) = 0;
+
+        //  Ask to be notified after some time. Actual interval varies between
+        //  0 and max_timer_period ms. Timer is destroyed once it expires or,
+        //  optionally, when cancel_timer is called.
+        virtual void add_timer (struct i_poll_events *events_) = 0;
+
+        //  Cancel the timer set by add_timer method.
+        virtual void cancel_timer (struct i_poll_events *events_) = 0;
+
+        //  Returns load experienced by the I/O thread. Currently it's number
+        //  of file descriptors handled by the poller, in the future we may
+        //  use a metric taking actual traffic on the individual sockets into
+        //  account.
+        virtual int get_load () = 0;
+
+        //  Start the execution of the underlying I/O thread.
+        //  This method is called from a foreign thread.
+        virtual void start () = 0;
+
+        //  Ask underlying I/O thread to stop. This method is called from
+        //  underlying thread (callback from io_thread object).
+        virtual void stop () = 0;
+
+        //  Wait for termination of undelying I/O thread.
+        //  This method is called from a foreign thread.
+        virtual void join () = 0;
+    };
+
+}
+
+#endif