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diff --git a/src/pgm_sender.hpp b/src/pgm_sender.hpp
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+/*
+    Copyright (c) 2009-2011 250bpm s.r.o.
+    Copyright (c) 2007-2009 iMatix Corporation
+    Copyright (c) 2010-2011 Miru Limited
+    Copyright (c) 2007-2011 Other 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_PGM_SENDER_HPP_INCLUDED__
+#define __ZMQ_PGM_SENDER_HPP_INCLUDED__
+
+#include "platform.hpp"
+
+#if defined ZMQ_HAVE_OPENPGM
+
+#ifdef ZMQ_HAVE_WINDOWS
+#include "windows.hpp"
+#endif
+
+#include "stdint.hpp"
+#include "io_object.hpp"
+#include "i_engine.hpp"
+#include "options.hpp"
+#include "pgm_socket.hpp"
+#include "encoder.hpp"
+
+namespace zmq
+{
+
+    class io_thread_t;
+    class session_base_t;
+
+    class pgm_sender_t : public io_object_t, public i_engine
+    {
+
+    public:
+
+        pgm_sender_t (zmq::io_thread_t *parent_, const options_t &options_);
+        ~pgm_sender_t ();
+
+        int init (bool udp_encapsulation_, const char *network_);
+
+        //  i_engine interface implementation.
+        void plug (zmq::io_thread_t *io_thread_,
+            zmq::session_base_t *session_);
+        void terminate ();
+        void activate_in ();
+        void activate_out ();
+
+        //  i_poll_events interface implementation.
+        void in_event ();
+        void out_event ();
+        void timer_event (int token);
+
+    private:
+
+        //  Unplug the engine from the session.
+        void unplug ();
+
+        //  TX and RX timeout timer ID's.
+        enum {tx_timer_id = 0xa0, rx_timer_id = 0xa1};
+
+        //  Timers are running.
+        bool has_tx_timer;
+        bool has_rx_timer;
+
+        //  Message encoder.
+        encoder_t encoder;
+
+        //  PGM socket.
+        pgm_socket_t pgm_socket;
+
+        //  Socket options.
+        options_t options;
+
+        //  Poll handle associated with PGM socket.
+        handle_t handle;
+        handle_t uplink_handle;
+        handle_t rdata_notify_handle;
+        handle_t pending_notify_handle;
+
+        //  Output buffer from pgm_socket.
+        unsigned char *out_buffer;
+        
+        //  Output buffer size.
+        size_t out_buffer_size;
+
+        //  Number of bytes in the buffer to be written to the socket.
+        //  If zero, there are no data to be sent.
+        size_t write_size;
+
+        pgm_sender_t (const pgm_sender_t&);
+        const pgm_sender_t &operator = (const pgm_sender_t&);
+    };
+
+}
+#endif
+
+#endif