- Added NullPolicyException to scheduler

- Started code for printing the state of the scheduling
- Fixed a bug in the copy constructor of DynamicThread

git-svn-id: svn://svn.gna.org/svn/sgpemv2/trunk@794 3ecf2c5c-341e-0410-92b4-d18e462d057c

src/text_simulation.hh

@@ -29,6 +29,7 @@
 #include "templates/smartp.hh"
 //#include "backend/policy_parameters.hh"
 #include "backend/string_utils.hh"
+#include "backend/history_observer.hh"
 
 #include "smartp.hh"
 
@@ -55,9 +56,10 @@ namespace sgpem
     Any object returned after the call to Simulation will be returned to the output
     devices(s) in a human-readable format.
    */
-  class SG_DLLEXPORT TextSimulation : public sigc::trackable
+  class SG_DLLEXPORT TextSimulation : public HistoryObserver
   {
   public:
+    TextSimulation();
     ~TextSimulation();
 
     /**
@@ -120,13 +122,13 @@ namespace sgpem
      */
     void add_io_device(memory::smart_ptr<IOManager>);
 
+  private:
     /**
       Prints the actual state of the simulation, with emphasis on the current
       status of the scheduling process (ready queue and running process).
      */
-    void update();
+    virtual void update(const History& changed_history);
 
-  private:
     bool check_arguments_num(const Tokens& arguments, unsigned int num);
     template <typename Container>
     void show(const Container& entities);