- Start implementing Scheduler::step_forward(). Whoohooo!

- Changed Schedulable::get_remaining_time() in get_elapsed_time()


git-svn-id: svn://svn.gna.org/svn/sgpemv2/trunk@702 3ecf2c5c-341e-0410-92b4-d18e462d057c

src/backend/concrete_history.cc

@@ -95,6 +95,7 @@ void
 ConcreteHistory::append_new_environment(ConcreteEnvironment* environment)
 {
 	_snapshots.push_back(environment);
+	notify_change();
 }
 
 

src/backend/dynamic_process.cc

@@ -122,7 +122,7 @@ DynamicProcess::get_state() const
   // pass from state_future to state_terminated:
 
   // (d2)
-  int elapsed_time = get_total_cpu_time() - get_remaining_time();
+  int elapsed_time = get_elapsed_time();
   if(result == state_future && next_thread_starts_at > elapsed_time )
     result = state_terminated;
 

src/backend/dynamic_schedulable.cc

@@ -84,9 +84,9 @@ DynamicSchedulable::get_current_priority() const
 }
 
 unsigned int
-DynamicSchedulable::get_remaining_time() const
+DynamicSchedulable::get_elapsed_time() const
 {
-  return get_total_cpu_time() - _ran_for;
+  return _ran_for;
 }
 
 void

src/backend/dynamic_schedulable.hh

@@ -68,7 +68,7 @@ namespace sgpem
 
     virtual int get_current_priority() const;
 
-    virtual unsigned int get_remaining_time() const;
+    virtual unsigned int get_elapsed_time() const;
 
     virtual void decrease_remaining_time();
 

src/backend/history.hh

@@ -67,8 +67,8 @@ namespace sgpem
   	virtual ~History() = 0;
 		
 		virtual       size_t       get_size() = 0;
-		virtual const Environment& get_last_environment(position index) const = 0;
-		virtual const Environment& get_environment_at() const throw(std::out_of_range) = 0;
+		virtual const Environment& get_last_environment() const = 0;
+		virtual const Environment& get_environment_at(position index) const throw(std::out_of_range) = 0;
 		
 		virtual void  remove(resource_key_t resource_key)  = 0;
 		virtual void  remove(Process&    process)          = 0;

src/backend/schedulable.hh

@@ -57,7 +57,7 @@ namespace sgpem
 
     virtual unsigned int get_arrival_time() const = 0;
 
-    virtual unsigned int get_remaining_time() const = 0;
+    virtual unsigned int get_elapsed_time() const = 0;
 
     virtual int get_base_priority() const = 0;
 

src/backend/scheduler.cc

@@ -18,7 +18,10 @@
 // along with SGPEMv2; if not, write to the Free Software
 // Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
 
+#include "concrete_environment.hh"
+#include "concrete_history.hh"
 #include "policy.hh"
+#include "schedulable.hh"
 #include "scheduler.hh"
 #include "policy_manager.hh"
 #include "policies_gatekeeper.hh"
@@ -34,6 +37,33 @@ using namespace sgpem;
 // Explicit template instantiation to allow to export symbols from the DSO.
 template class SG_DLLEXPORT Singleton<Scheduler>;
 
+
+// ------------------ Static helper functions --------------
+
+
+// Collects all threads of an environment into a single vector
+static void 
+collect_threads(const std::vector<Process*>& procs, 
+		std::vector<DynamicThread*>& collected_threads)
+{
+  typedef std::vector<Process*> Processes;
+  typedef std::vector<Thread*>  Threads;
+
+  collected_threads.clear();
+  for(Processes::const_iterator it1 = procs.begin(); it1 != procs.end(); it1++)
+    {
+      const Threads& ts = (*it1)->get_threads();
+      for(Threads::const_iterator it2 = ts.begin(); it2 != ts.end(); it2++) 
+	collected_threads.push_back((DynamicThread*) *it2);
+    }
+}
+
+
+// ---------------------------------------------------------
+
+
+
+
 //private constructor. The parameter is discarded
 Scheduler::Scheduler()
     : _policy_manager(PolicyManager::get_registered_manager())
@@ -71,16 +101,72 @@ Scheduler::get_policy()
 void
 Scheduler::step_forward(History& history, Policy& cpu_policy) throw(UserInterruptException)
 {
+  // NOTE: Be sure to read the *ORIGINAL* documentation in the design document for this method!
 
+  // FIXME: handle me! I'm not just a pretty boolean, I want to be *USED*! *EXPLOITED*!
+  //        *RAPED*! *MAKE ME BLEED*!
+  bool simulation_ended = true; // Assume we've finished. Then prove me wrong.
+
+  ConcreteHistory& concrete_history = (ConcreteHistory&) history;
+  ConcreteEnvironment* new_snapshot = new ConcreteEnvironment(concrete_history.get_last_environment());
+  
+  typedef std::vector<DynamicProcess*> Processes;
+  typedef std::vector<DynamicThread*>  Threads;
+  
+  Threads all_threads;
+
+  collect_threads(new_snapshot->get_processes(), all_threads);
+
+  // designer + implementer (Matteo) comment follows:
+  // FIXME: decreasing the time elapsed of the running thread + process 
+  // should maybe be done here as the first thing, instead than 
+  // directly when selecting them
+
+  // 1. mark future threads as ready, if appropriate
+  // 2. mark ended threads as terminated
+  for(Threads::iterator it = all_threads.begin(); it != all_threads.end(); it++)
+    {
+      if((*it)->get_state() == Schedulable::state_future)
+	{
+	  Process& parent = (*it)->get_process();
+	  if(parent.get_elapsed_time() == (*it)->get_arrival_time())
+	    (*it)->set_state(Schedulable::state_ready);
+	}
+      
+      if((*it)->get_total_cpu_time() - (*it)->get_elapsed_time() == 0)
+	(*it)->set_state(Schedulable::state_terminated);
+      
+      // 3. check for simulation termination (we can directly use threads)
+      // for this check, since processes' state is based upon theirs)
+      if(simulation_ended && 
+	 ((*it)->get_state() & (Schedulable::state_blocked | 
+				Schedulable::state_terminated)) == 0)
+	simulation_ended = false;
+    }
+
+
+  //                    /
+  //                  /
+  //                /
+  // (I'M HERE)   < * * * * * * * * * * *  
+  //		    \
+  //                  \
+  //                    \
+  //
+  // (is it visible enough for you?)
 
   try
   {
-    
+    // call the policy to sort the queue
+    // ...
   }
   catch( UserInterruptException e )
   {
     _policy_manager.init();
-    //TODO Do we need to perform some cleanup operation here?
+
+    //TODO Do we need to perform some other cleanup operation here?
+    delete new_snapshot;
+
     // Do we need to update something?
 
     // Going up unwinding the stack, tell:
@@ -88,5 +174,6 @@ Scheduler::step_forward(History& history, Policy& cpu_policy) throw(UserInterrup
     //    - SimulationController that everything stopped
     throw;
   }
-}
   
+  concrete_history.append_new_environment(new_snapshot);
+}

src/backend/scheduler.hh

@@ -92,6 +92,7 @@ namespace sgpem
 
   private:
     Scheduler();     //private constructor.
+       
     ReadyQueue  _ready_queue;
     PolicyManager&   _policy_manager;
   };