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diff --git a/gnuradio-core/src/lib/runtime/gr_scheduler.h b/gnuradio-core/src/lib/runtime/gr_scheduler.h
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+++ b/gnuradio-core/src/lib/runtime/gr_scheduler.h
@@ -0,0 +1,65 @@
+/* -*- c++ -*- */
+/*
+ * Copyright 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 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 <gr_core_api.h>
+#include <boost/utility.hpp>
+#include <gr_block.h>
+#include <gr_flat_flowgraph.h>
+
+
+class gr_scheduler;
+typedef boost::shared_ptr<gr_scheduler> gr_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_CORE_API gr_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.
+   */
+  gr_scheduler(gr_flat_flowgraph_sptr ffg, int max_noutput_items);
+
+  virtual ~gr_scheduler();
+
+  /*!
+   * \brief Tell the scheduler to stop executing.
+   */
+  virtual void stop() = 0;
+
+  /*!
+   * \brief Block until the graph is done.
+   */
+  virtual void wait() = 0;
+};
+
+#endif /* INCLUDED_GR_SCHEDULER_H */