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diff --git a/gnuradio-runtime/lib/scheduler.h b/gnuradio-runtime/lib/scheduler.h
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+++ b/gnuradio-runtime/lib/scheduler.h
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+/* -*- c++ -*- */
+/*
+ * Copyright 2008,2013 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 this program; if not, write to the Free Software Foundation, Inc.,
+ * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
+ */
+
+#ifndef INCLUDED_GR_SCHEDULER_H
+#define INCLUDED_GR_SCHEDULER_H
+
+#include <gnuradio/api.h>
+#include <boost/utility.hpp>
+#include <gnuradio/block.h>
+#include "flat_flowgraph.h"
+
+namespace gr {
+
+  class scheduler;
+  typedef boost::shared_ptr<scheduler> scheduler_sptr;
+
+  /*!
+   * \brief Abstract scheduler that takes a flattened flow graph and
+   * runs it.
+   *
+   * Preconditions: details, buffers and buffer readers have been
+   * assigned.
+   */
+  class GR_RUNTIME_API scheduler : boost::noncopyable
+  {
+  public:
+    /*!
+     * \brief Construct a scheduler and begin evaluating the graph.
+     *
+     * The scheduler will continue running until all blocks until they
+     * report that they are done or the stop method is called.
+     */
+    scheduler(flat_flowgraph_sptr ffg, int max_noutput_items);
+
+    virtual ~scheduler();
+
+    /*!
+     * \brief Tell the scheduler to stop executing.
+     */
+    virtual void stop() = 0;
+
+    /*!
+     * \brief Block until the graph is done.
+     */
+    virtual void wait() = 0;
+  };
+
+} /* namespace gr */
+
+#endif /* INCLUDED_GR_SCHEDULER_H */