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diff --git a/gr-blocks/lib/message_debug_impl.h b/gr-blocks/lib/message_debug_impl.h
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+++ b/gr-blocks/lib/message_debug_impl.h
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+/* -*- c++ -*- */
+/*
+ * Copyright 2005,2012-2013 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 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_MESSAGE_DEBUG_IMPL_H
+#define INCLUDED_GR_MESSAGE_DEBUG_IMPL_H
+
+#include <blocks/message_debug.h>
+#include <gr_block.h>
+#include <gruel/thread.h>
+#include <gruel/pmt.h>
+
+namespace gr {
+  namespace blocks {
+
+    class message_debug_impl : public message_debug
+    {
+    private:
+
+      /*!
+       * \brief Messages received in this port are printed to stdout.
+       *
+       * This port receives messages from the scheduler's message
+       * handling mechanism and prints it to stdout. This message
+       * handler function is only meant to be used by the scheduler to
+       * handle messages posted to port 'print'.
+       *
+       * \param msg A pmt message passed from the scheduler's message handling.
+       */
+      void print(pmt::pmt_t msg);
+
+      /*!
+       * \brief PDU formatted messages received in this port are printed to stdout.
+       *
+       * This port receives messages from the scheduler's message
+       * handling mechanism and prints it to stdout. This message
+       * handler function is only meant to be used by the scheduler to
+       * handle messages posted to port 'print'.
+       *
+       * \param pdu A PDU message passed from the scheduler's message handling.
+       */
+      void print_pdu(pmt::pmt_t pdu);
+
+      /*!
+       * \brief Messages received in this port are stored in a vector.
+       *
+       * This port receives messages from the scheduler's message
+       * handling mechanism and stores it in a vector. Messages can be
+       * retrieved later using the 'get_message' function. This
+       * message handler function is only meant to be used by the
+       * scheduler to handle messages posted to port 'store'.
+       *
+       * \param msg A pmt message passed from the scheduler's message handling.
+       */
+      void store(pmt::pmt_t msg);
+
+      gruel::mutex d_mutex;
+      std::vector<pmt::pmt_t> d_messages;
+
+    public:
+      message_debug_impl();
+      ~message_debug_impl();
+
+      int num_messages();
+      pmt::pmt_t get_message(int i);
+    };
+
+  } /* namespace blocks */
+} /* namespace gr */
+
+#endif /* INCLUDED_GR_MESSAGE_DEBUG_IMPL_H */