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diff --git a/lib/gras_impl/output_buffer_queues.hpp b/lib/gras_impl/output_buffer_queues.hpp
new file mode 100644
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+++ b/lib/gras_impl/output_buffer_queues.hpp
@@ -0,0 +1,99 @@
+//
+// Copyright 2012 Josh Blum
+//
+// This program is free software: you can redistribute it and/or modify
+// it under the terms of the GNU Lesser General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+//
+// This program 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 Lesser General Public License for more details.
+//
+// You should have received a copy of the GNU Lesser General Public License
+// along with io_sig program.  If not, see <http://www.gnu.org/licenses/>.
+
+#ifndef INCLUDED_LIBGRAS_IMPL_OUTPUT_BUFFER_QUEUES_HPP
+#define INCLUDED_LIBGRAS_IMPL_OUTPUT_BUFFER_QUEUES_HPP
+
+#include <boost/dynamic_bitset.hpp>
+#include <vector>
+#include <deque>
+
+namespace gnuradio
+{
+
+template <typename T>
+struct OutputBufferQueues
+{
+    boost::dynamic_bitset<> _bitset;
+    std::vector<std::deque<T> > _queues;
+
+    inline void resize(const size_t size)
+    {
+        _bitset.resize(size);
+        _queues.resize(size);
+    }
+
+    inline void push(const size_t i, const T &value)
+    {
+        _queues[i].push_back(value);
+        _bitset.set(i);
+    }
+
+    //! used for input buffer inlining
+    inline void push_front(const size_t i, const T &value)
+    {
+        _queues[i].push_front(value);
+        _bitset.set(i);
+    }
+
+    inline const T &front(const size_t i) const
+    {
+        return _queues[i].front();
+    }
+
+    inline T &front(const size_t i)
+    {
+        return _queues[i].front();
+    }
+
+    inline void pop(const size_t i)
+    {
+        _queues[i].pop_front();
+        _bitset.set(i, not _queues[i].empty());
+    }
+
+    inline void flush(const size_t i)
+    {
+        _queues[i] = std::deque<T>();
+        _bitset.reset(i);
+    }
+
+    inline void flush_all(void)
+    {
+        _queues.clear();
+        _queues.resize(_bitset.size());
+        _bitset.reset();
+    }
+
+    inline bool ready(const size_t i) const
+    {
+        return not _queues[i].empty();
+    }
+
+    inline bool empty(const size_t i) const
+    {
+        return _queues[i].empty();
+    }
+
+    inline bool all_ready(void) const
+    {
+        return (~_bitset).none();
+    }
+};
+
+} //namespace gnuradio
+
+#endif /*INCLUDED_LIBGRAS_IMPL_OUTPUT_BUFFER_QUEUES_HPP*/