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diff --git a/gnuradio-runtime/lib/tpb_thread_body.h b/gnuradio-runtime/lib/tpb_thread_body.h
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+++ b/gnuradio-runtime/lib/tpb_thread_body.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_TPB_THREAD_BODY_H
+#define INCLUDED_GR_TPB_THREAD_BODY_H
+
+#include <gnuradio/api.h>
+#include <gnuradio/block.h>
+#include <gnuradio/block_detail.h>
+#include "block_executor.h"
+
+namespace gr {
+
+  /*!
+   * \brief The body of each thread-per-block thread.
+   *
+   * One of these is instantiated in its own thread for each block.
+   * The constructor turns into the main loop which returns when the
+   * block is done or is interrupted.
+   */
+  class GR_RUNTIME_API tpb_thread_body
+  {
+    block_executor d_exec;
+
+  public:
+    tpb_thread_body(block_sptr block, int max_noutput_items=100000);
+    ~tpb_thread_body();
+  };
+
+} /* namespace gr */
+
+#endif /* INCLUDED_GR_TPB_THREAD_BODY_H */