- Make Scheduler::step_forward return a bool representing if

the step went okay or otherwise if the simulation ended
- Fix simulation states in concrete_simulation.cc
- Manage end of input (now CTRL+D exits the program, and 
you can redirect a file in input knowing that at EOF
sgpemv2 will terminate)
- Fix a bug in Scheduler that didn't add the newly created
environment to History when the simulation ended, thus leading
both to a memory leak and an inconsistency in representing
the simulation


git-svn-id: svn://svn.gna.org/svn/sgpemv2/trunk@807 3ecf2c5c-341e-0410-92b4-d18e462d057c

src/backend/concrete_simulation.cc

@@ -82,53 +82,31 @@ ConcreteSimulation::run() throw(UserInterruptException, NullPolicyException)
   case state_stopped:
     _history.reset(true);
     break;
+  default:
+    ;
   }
 
   _state = state_running;
 
-
-  // chech for termination
-  const Environment &env = _history.get_last_environment();
-  const Environment::Processes& processes = env.get_processes();
-  typedef Environment::Processes::const_iterator ProcessesIt;
-  
-  //*******  CONTINUOUS TIME
-
-  if (_mode)
-  {
-    do
-    {
-
-      bool all_term = true;
-      for(ProcessesIt it = processes.begin(); it != processes.end(); ++it)
-        if((*it)->get_state() != Schedulable::state_terminated)
-        {
-          all_term = false;
-          break;
-        }
-
-      //if there are no processes left the termination message has already been notified
-      //by the last execution of upadate()
-      if (all_term)
-      {
-        _state = state_stopped;
-        return; // Exit from loop
-      }
-
-      try
-      {
   if(get_policy() == NULL)
     {
       stop();
       throw NullPolicyException("no policy selected");
     }
   
+  //*******  CONTINUOUS TIME
+  if (_mode)
+  {
+    do
+      {
+        try
+          {        
             //step forward
-	Scheduler::get_instance().step_forward(_history, *get_policy());
+            bool yet_to_finish = Scheduler::get_instance().step_forward(_history, *get_policy());
+            if(!yet_to_finish) stop();
             
             //sleep
             Glib::usleep(_timer_interval*1000);
-
           }
         catch(UserInterruptException e)
           {
@@ -139,41 +117,29 @@ ConcreteSimulation::run() throw(UserInterruptException, NullPolicyException)
         //check the state
         if (_state == state_stopped || _state == state_paused)
           return;
-
       }
     while(true);
   }
   
   //******* STEP by STEP
   else
-  {
-    bool all_term = true;
-    for(ProcessesIt it = processes.begin(); it != processes.end(); ++it)
-      if((*it)->get_state() != Schedulable::state_terminated)
-      {
-	all_term = false;
-	break;
-      }
-
-    if (all_term)
-      //if there are no processes left the termination message has already been notified
-      //by the last execution of upadate()
-      _state = state_paused;
-    else
   {
     try
       {
         assert(get_policy() != NULL);
         //step forward
-	Scheduler::get_instance().step_forward(_history, *get_policy());
+        bool yet_to_finish = Scheduler::get_instance().step_forward(_history, *get_policy());
+        if(yet_to_finish)
+          pause();
+        else
+          stop();
       }
     catch(UserInterruptException e)
       {
+        stop();
         throw;
       } 
   }
-  }
-
 }
 
 Simulation::state

src/backend/scheduler.cc

@@ -161,7 +161,7 @@ Scheduler::get_policy()
 }
 
 
-void
+bool
 Scheduler::step_forward(History& history, Policy& cpu_policy) throw(UserInterruptException)
 {
 	// This very method should be exclusive: no concurrent behaviour, from when we 
@@ -233,7 +233,9 @@ Scheduler::step_forward(History& history, Policy& cpu_policy) throw(UserInterrup
 	
 	
 	// ----------  FIXME ----------------
-	// What to do now if the simulation ended?
+	// Check correctness: Now if the simulation ended we
+  // append the newly created environment and return false
+  if(simulation_ended) goto final_cleanup;
  
 
 	/*                    /
@@ -330,6 +332,8 @@ Scheduler::step_forward(History& history, Policy& cpu_policy) throw(UserInterrup
 			throw;
 		}		
 
+ final_cleanup:
+ 
 	// append the new snapshot...
 	// ...and remember to release the auto_ptr!
 	concrete_history.append_new_environment(new_snapshot.release());
@@ -337,6 +341,9 @@ Scheduler::step_forward(History& history, Policy& cpu_policy) throw(UserInterrup
 	// Reset values that the policy doesn't need anymore
 	_policy      = NULL;
 	_ready_queue = NULL;
+
+  // If we got there, a step has been performed
+  return simulation_ended == false;
 }
 
 

src/backend/scheduler.hh

@@ -74,8 +74,10 @@ namespace sgpem
        Generates a new ReadyQueue representing the status of the processes
        at the simulation instant next to the current one, and extends the History by
        one instant with it.
+       
+       \return false If the simulation has ended, true otherwise
     */
-    void       step_forward(History& history, Policy& cpu_policy) throw(UserInterruptException);
+    bool       step_forward(History& history, Policy& cpu_policy) throw(UserInterruptException);
 
     /**
        Returns the policy that will be used to generate the simulation at the next instant.

src/parse_opts.cc

@@ -131,15 +131,12 @@ parse_options(int argc, char** argv)
 					// initialize the command line version
 					// of sgpemv2
 					TextSimulation sim;
-					
-					while(1)
-						{
           std::string str;
-							getline(std::cin, str);
 
+					while(getline(std::cin, str))
+            // Enter main loop
             TextSimulation::parse_command(sim, str);
 				} 
-				} 
 			else 
 				{
 					GuiBuilder* gui = new GuiBuilder();

src/text_simulation.cc

@@ -494,8 +494,7 @@ TextSimulation::on_help(const Tokens& arguments)
 	  "the cpu policy.\n\nThis is currently the only way to control the behaviour of "
 	  "cpu policies without modifying their source code.\n"));
   else if(command == "HELP")
-    p_stdout(_("-- Do you really want me to explain what HELP means? --\n"
+    p_stdout(_("-- HELP COMMAND --\nThe help you're reading"));
-      "   ************** YOU ARE JOKING ME !!! ************\n"));
   else if(command == "GET")
     p_stdout(_("-- GET COMMAND --\nSyntax: GET <attr_name>\n"
       "\twhere <attr_name> may be simulation-tick or continuous.\n"));

src/text_simulation.hh

@@ -171,6 +171,7 @@ namespace sgpem
     
     std::vector<memory::smart_ptr<IOManager> > _devices;
     static void _io_loop(std::pair<TextSimulation*, int>);
+    
   };
 
 }