--- /dev/null
+/* -*- 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_scheduler.h>
+#include <boost/thread.hpp>
+
+typedef boost::mutex gr_mutex; // FIXME move these elsewhere
+typedef boost::lock_guard<boost::mutex> gr_lock_guard;
+
+/*!
+ *\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_top_block_impl
+{
+public:
+ gr_top_block_impl(gr_top_block *owner);
+ ~gr_top_block_impl();
+
+ // Create and start scheduler threads
+ void start();
+
+ // 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();
+
+ // Dump the flowgraph to stdout
+ void dump();
+
+protected:
+
+ enum tb_state { IDLE, RUNNING };
+
+ gr_top_block *d_owner;
+ gr_flat_flowgraph_sptr d_ffg;
+ gr_scheduler_sptr d_scheduler;
+
+ gr_mutex d_mutex; // protects d_state and d_lock_count
+ tb_state d_state;
+ int d_lock_count;
+
+private:
+ void restart();
+};
+
+#endif /* INCLUDED_GR_TOP_BLOCK_IMPL_H */