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diff --git a/gr-blocks/lib/tcp_server_sink_impl.h b/gr-blocks/lib/tcp_server_sink_impl.h
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index 0000000000..d10f3b95b8
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+++ b/gr-blocks/lib/tcp_server_sink_impl.h
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+/* -*- c++ -*- */
+/*
+ * Copyright 2014 Free Software Foundation, Inc.
+ *
+ * This file is part of GNU Radio
+ *
+ * GNU Radio 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, or (at your option)
+ * any later version.
+ *
+ * GNU Radio 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 GNU Radio; see the file COPYING.  If not, write to
+ * the Free Software Foundation, Inc., 51 Franklin Street,
+ * Boston, MA 02110-1301, USA.
+ */
+
+#ifndef INCLUDED_GR_TCP_SERVER_SINK_IMPL_H
+#define INCLUDED_GR_TCP_SERVER_SINK_IMPL_H
+
+#include <gnuradio/blocks/tcp_server_sink.h>
+#include <boost/asio.hpp>
+#include <set>
+#include <boost/ptr_container/ptr_vector.hpp>
+
+namespace gr {
+  namespace blocks {
+
+    class tcp_server_sink_impl : public tcp_server_sink
+    {
+    private:
+      size_t d_itemsize;
+
+      boost::asio::io_service d_io_service;
+      gr::thread::thread d_io_serv_thread;
+      boost::asio::ip::tcp::endpoint d_endpoint;
+      std::auto_ptr<boost::asio::ip::tcp::socket> d_socket;
+      std::set<boost::asio::ip::tcp::socket *> d_sockets;
+      boost::asio::ip::tcp::acceptor d_acceptor;
+
+      boost::shared_ptr<uint8_t> d_buf;
+      enum {
+          BUF_SIZE = 256 * 1024,
+      };
+
+      int d_writing;
+      boost::condition_variable d_writing_cond;
+      boost::mutex d_writing_mut;
+
+      void do_accept(const boost::system::error_code& error);
+      void do_write(const boost::system::error_code& error, std::size_t len,
+              std::set<boost::asio::ip::tcp::socket *>::iterator);
+
+    public:
+      tcp_server_sink_impl(size_t itemsize,
+                    const std::string &host, int port,
+                    bool noblock);
+      ~tcp_server_sink_impl();
+
+      int work(int noutput_items,
+               gr_vector_const_void_star &input_items,
+               gr_vector_void_star &output_items);
+    };
+
+  } /* namespace blocks */
+} /* namespace gr */
+
+#endif /* INCLUDED_GR_TCP_SERVER_SINK_IMPL_H */