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diff --git a/gnuradio-runtime/lib/gr_block_executor.h b/gnuradio-runtime/lib/gr_block_executor.h
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+/* -*- c++ -*- */
+/*
+ * Copyright 2004,2008 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_BLOCK_EXECUTOR_H
+#define INCLUDED_GR_BLOCK_EXECUTOR_H
+
+#include <gr_runtime_api.h>
+#include <gr_runtime_types.h>
+#include <fstream>
+#include <gr_tags.h>
+
+//class gr_block_executor;
+//typedef boost::shared_ptr<gr_block_executor>	gr_block_executor_sptr;
+
+
+/*!
+ * \brief Manage the execution of a single block.
+ * \ingroup internal
+ */
+
+class GR_RUNTIME_API gr_block_executor {
+protected:
+  gr_block_sptr			d_block;	// The block we're trying to run
+  std::ofstream	       	       *d_log;
+
+  // These are allocated here so we don't have to on each iteration
+
+  gr_vector_int			d_ninput_items_required;
+  gr_vector_int			d_ninput_items;
+  gr_vector_const_void_star	d_input_items;
+  std::vector<bool>		d_input_done;
+  gr_vector_void_star		d_output_items;
+  std::vector<uint64_t>         d_start_nitems_read; //stores where tag counts are before work
+  std::vector<gr_tag_t>       d_returned_tags;
+  int                           d_max_noutput_items;
+
+#ifdef GR_PERFORMANCE_COUNTERS
+  bool d_use_pc;
+#endif /* GR_PERFORMANCE_COUNTERS */
+
+ public:
+  gr_block_executor(gr_block_sptr block, int max_noutput_items=100000);
+  ~gr_block_executor ();
+
+  enum state {
+    READY,	      // We made progress; everything's cool.
+    READY_NO_OUTPUT,  // We consumed some input, but produced no output.
+    BLKD_IN,	      // no progress; we're blocked waiting for input data.
+    BLKD_OUT,	      // no progress; we're blocked waiting for output buffer space.
+    DONE,	      // we're done; don't call me again.
+  };
+
+  /*
+   * \brief Run one iteration.
+   */
+  state run_one_iteration();
+};
+
+#endif /* INCLUDED_GR_BLOCK_EXECUTOR_H */