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diff --git a/gnuradio-runtime/include/gnuradio/tpb_detail.h b/gnuradio-runtime/include/gnuradio/tpb_detail.h
new file mode 100644
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+++ b/gnuradio-runtime/include/gnuradio/tpb_detail.h
@@ -0,0 +1,93 @@
+/* -*- c++ -*- */
+/*
+ * Copyright 2008,2009,2013 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_DETAIL_H
+#define INCLUDED_GR_TPB_DETAIL_H
+
+#include <gnuradio/api.h>
+#include <gnuradio/thread/thread.h>
+#include <deque>
+#include <pmt/pmt.h>
+
+namespace gr {
+
+  class block_detail;
+
+  /*!
+   * \brief used by thread-per-block scheduler
+   */
+  struct GR_RUNTIME_API tpb_detail {
+    gr::thread::mutex			mutex;			//< protects all vars
+    bool				input_changed;
+    gr::thread::condition_variable	input_cond;
+    bool				output_changed;
+    gr::thread::condition_variable	output_cond;
+
+  public:
+    tpb_detail()
+      : input_changed(false), output_changed(false) { }
+
+    //! Called by us to tell all our upstream blocks that their output
+    //! may have changed.
+    void notify_upstream(block_detail *d);
+
+    //! Called by us to tell all our downstream blocks that their
+    //! input may have changed.
+    void notify_downstream(block_detail *d);
+
+    //! Called by us to notify both upstream and downstream
+    void notify_neighbors(block_detail *d);
+
+    //! Called by pmt msg posters
+    void notify_msg() {
+      input_cond.notify_one();
+      output_cond.notify_one();
+    }
+
+    //! Called by us
+    void clear_changed()
+    {
+      gr::thread::scoped_lock guard(mutex);
+      input_changed = false;
+      output_changed = false;
+    }
+
+  private:
+    //! Used by notify_downstream
+    void set_input_changed()
+    {
+      gr::thread::scoped_lock guard(mutex);
+      input_changed = true;
+      input_cond.notify_one();
+    }
+
+    //! Used by notify_upstream
+    void set_output_changed()
+    {
+      gr::thread::scoped_lock guard(mutex);
+      output_changed = true;
+      output_cond.notify_one();
+    }
+  };
+
+} /* namespace gr */
+
+#endif /* INCLUDED_GR_TPB_DETAIL_H */