- added scheduler and other incomplete backend classes

git-svn-id: svn://svn.gna.org/svn/sgpemv2/trunk@319 3ecf2c5c-341e-0410-92b4-d18e462d057c

src/backend/scheduler.hh

@@ -0,0 +1,73 @@
+// src/backend/scheduler.hh - Copyright 2005, 2006, University
+//               of Padova, dept. of Pure and Applied
+//               Mathematics
+//
+// This file is part of SGPEMv2.
+//
+// This 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 2 of the License, or
+// (at your option) any later version.
+//
+// SGPEMv2 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 SGPEMv2; if not, write to the Free Software
+// Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
+
+#ifndef SCHEDULER_HH
+#define SCHEDULER_HH 1
+namespace sgpem
+{
+	class Policy;
+}
+
+#include "config.h"
+
+#include <limits>
+
+
+#include "observed_subject.hh"
+#include "history.hh"
+#include "schedulable_list.hh"
+
+namespace sgpem
+{
+	class Scheduler;
+
+	/**	\brief 
+	
+	*/
+
+	class SG_DLLEXPORT Scheduler : public ObservedSubject 
+	{
+	public:
+		enum event
+		{
+			event_schedulable_arrival,
+			event_schedulable_termination,
+			event_end_time_slice
+		};
+
+		static Scheduler&  			get_instance();
+		SchedulableList*			get_ready_queue();
+		void 						reset_status();
+		void 						step_forward();
+				
+	private:
+		Scheduler(int);					//private constructor. The parameter is discarded
+		static Scheduler  	_instance;
+		SchedulableList		_ready_queue;
+		Policy* 			_policy;
+	};
+
+}//~ namespace sgpem
+
+#endif //SCHEDULER_HH
+
+
+
+