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+// $Id$
+
+/*
+ Copyright (c) 2007-2012, Trustees of The Leland Stanford Junior University
+ All rights reserved.
+
+ Redistribution and use in source and binary forms, with or without
+ modification, are permitted provided that the following conditions are met:
+
+ Redistributions of source code must retain the above copyright notice, this 
+ list of conditions and the following disclaimer.
+ Redistributions in binary form must reproduce the above copyright notice, this
+ list of conditions and the following disclaimer in the documentation and/or
+ other materials provided with the distribution.
+
+ THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
+ ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
+ WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE 
+ DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR
+ ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
+ (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
+ LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON
+ ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
+ SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+*/
+
+#ifndef _PRIO_ARB_HPP_
+#define _PRIO_ARB_HPP_
+
+#include <list>
+
+#include "module.hpp"
+#include "config_utils.hpp"
+
+class PriorityArbiter : public Module {
+  int _rr_ptr;
+
+protected:
+  const int _inputs;
+
+  struct sRequest {
+    int in;
+    int label;
+    int pri;
+  };
+
+  list<sRequest> _requests;
+
+  int _match;
+
+public:
+  PriorityArbiter( const Configuration &config,
+		   Module *parent, const string& name,
+		   int inputs );
+
+  void Clear( );
+
+  void AddRequest( int in, int label = 0, int pri = 0 );
+  void RemoveRequest( int in, int label = 0 );
+
+  int Match( ) const;
+
+  void Arbitrate( );
+  void Update( );
+};
+
+#endif