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diff --git a/gnuradio-runtime/lib/gr_top_block_impl.h b/gnuradio-runtime/lib/gr_top_block_impl.h
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+++ b/gnuradio-runtime/lib/gr_top_block_impl.h
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+/* -*- c++ -*- */
+/*
+ * Copyright 2007,2008 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_TOP_BLOCK_IMPL_H
+#define INCLUDED_GR_TOP_BLOCK_IMPL_H
+
+#include <gr_runtime_api.h>
+#include <gr_scheduler.h>
+#include <gruel/thread.h>
+
+/*!
+ *\brief Abstract implementation details of gr_top_block
+ * \ingroup internal
+ *
+ * The actual implementation of gr_top_block. Separate class allows
+ * decoupling of changes from dependent classes.
+ *
+ */
+class GR_RUNTIME_API gr_top_block_impl
+{
+public:
+  gr_top_block_impl(gr_top_block *owner);
+  ~gr_top_block_impl();
+
+  // Create and start scheduler threads
+  void start(int max_noutput_items=100000000);
+
+  // Signal scheduler threads to stop
+  void stop();
+
+  // Wait for scheduler threads to exit
+  void wait();
+
+  // Lock the top block to allow reconfiguration
+  void lock();
+
+  // Unlock the top block at end of reconfiguration
+  void unlock();
+
+  // Return a string list of edges
+  std::string edge_list();
+
+  // Dump the flowgraph to stdout
+  void dump();
+
+  // Get the number of max noutput_items in the flowgraph
+  int max_noutput_items();
+
+  // Set the maximum number of noutput_items in the flowgraph
+  void set_max_noutput_items(int nmax);
+
+protected:
+
+  enum tb_state { IDLE, RUNNING };
+
+  gr_top_block                  *d_owner;
+  gr_flat_flowgraph_sptr         d_ffg;
+  gr_scheduler_sptr		 d_scheduler;
+
+  gruel::mutex                   d_mutex;	// protects d_state and d_lock_count
+  tb_state			 d_state;
+  int                            d_lock_count;
+  int                            d_max_noutput_items;
+
+private:
+  void restart();
+};
+
+#endif /* INCLUDED_GR_TOP_BLOCK_IMPL_H */