- 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
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@ -53,7 +53,7 @@ namespace sgpem
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/// \brief Copy constructor.
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/// Performs a deep copy of all structures.
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ConcreteEnvironment(const ConcreteEnvironment & c);
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ConcreteEnvironment(const ConcreteEnvironment& c);
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/// \brief Returns an indexed set of snapshots of the processes
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@ -95,6 +95,7 @@ void
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ConcreteHistory::append_new_environment(ConcreteEnvironment* environment)
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{
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_snapshots.push_back(environment);
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notify_change();
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}
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@ -122,7 +122,7 @@ DynamicProcess::get_state() const
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// pass from state_future to state_terminated:
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// (d2)
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int elapsed_time = get_total_cpu_time() - get_remaining_time();
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int elapsed_time = get_elapsed_time();
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if(result == state_future && next_thread_starts_at > elapsed_time )
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result = state_terminated;
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@ -84,9 +84,9 @@ DynamicSchedulable::get_current_priority() const
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}
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unsigned int
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DynamicSchedulable::get_remaining_time() const
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DynamicSchedulable::get_elapsed_time() const
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{
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return get_total_cpu_time() - _ran_for;
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return _ran_for;
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}
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void
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@ -68,7 +68,7 @@ namespace sgpem
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virtual int get_current_priority() const;
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virtual unsigned int get_remaining_time() const;
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virtual unsigned int get_elapsed_time() const;
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virtual void decrease_remaining_time();
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@ -85,8 +85,8 @@ namespace sgpem
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* This function returns a reference to the actual schedable object
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* represented, along with its status, by this instance.
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*/
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virtual StaticSchedulable& get_core() = 0;
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virtual const StaticSchedulable& get_core() const = 0;
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virtual StaticSchedulable& get_core() = 0;
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virtual const StaticSchedulable& get_core() const = 0;
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private:
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int _ran_for;
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@ -67,8 +67,8 @@ namespace sgpem
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virtual ~History() = 0;
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virtual size_t get_size() = 0;
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virtual const Environment& get_last_environment(position index) const = 0;
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virtual const Environment& get_environment_at() const throw(std::out_of_range) = 0;
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virtual const Environment& get_last_environment() const = 0;
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virtual const Environment& get_environment_at(position index) const throw(std::out_of_range) = 0;
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virtual void remove(resource_key_t resource_key) = 0;
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virtual void remove(Process& process) = 0;
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@ -57,7 +57,7 @@ namespace sgpem
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virtual unsigned int get_arrival_time() const = 0;
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virtual unsigned int get_remaining_time() const = 0;
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virtual unsigned int get_elapsed_time() const = 0;
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virtual int get_base_priority() const = 0;
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@ -18,7 +18,10 @@
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// along with SGPEMv2; if not, write to the Free Software
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// Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
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#include "concrete_environment.hh"
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#include "concrete_history.hh"
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#include "policy.hh"
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#include "schedulable.hh"
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#include "scheduler.hh"
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#include "policy_manager.hh"
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#include "policies_gatekeeper.hh"
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@ -34,6 +37,33 @@ using namespace sgpem;
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// Explicit template instantiation to allow to export symbols from the DSO.
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template class SG_DLLEXPORT Singleton<Scheduler>;
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// ------------------ Static helper functions --------------
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// Collects all threads of an environment into a single vector
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static void
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collect_threads(const std::vector<Process*>& procs,
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std::vector<DynamicThread*>& collected_threads)
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{
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typedef std::vector<Process*> Processes;
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typedef std::vector<Thread*> Threads;
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collected_threads.clear();
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for(Processes::const_iterator it1 = procs.begin(); it1 != procs.end(); it1++)
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{
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const Threads& ts = (*it1)->get_threads();
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for(Threads::const_iterator it2 = ts.begin(); it2 != ts.end(); it2++)
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collected_threads.push_back((DynamicThread*) *it2);
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}
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}
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// ---------------------------------------------------------
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//private constructor. The parameter is discarded
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Scheduler::Scheduler()
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: _policy_manager(PolicyManager::get_registered_manager())
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@ -71,16 +101,72 @@ Scheduler::get_policy()
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void
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Scheduler::step_forward(History& history, Policy& cpu_policy) throw(UserInterruptException)
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{
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// NOTE: Be sure to read the *ORIGINAL* documentation in the design document for this method!
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// FIXME: handle me! I'm not just a pretty boolean, I want to be *USED*! *EXPLOITED*!
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// *RAPED*! *MAKE ME BLEED*!
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bool simulation_ended = true; // Assume we've finished. Then prove me wrong.
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ConcreteHistory& concrete_history = (ConcreteHistory&) history;
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ConcreteEnvironment* new_snapshot = new ConcreteEnvironment(concrete_history.get_last_environment());
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typedef std::vector<DynamicProcess*> Processes;
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typedef std::vector<DynamicThread*> Threads;
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Threads all_threads;
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collect_threads(new_snapshot->get_processes(), all_threads);
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// designer + implementer (Matteo) comment follows:
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// FIXME: decreasing the time elapsed of the running thread + process
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// should maybe be done here as the first thing, instead than
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// directly when selecting them
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// 1. mark future threads as ready, if appropriate
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// 2. mark ended threads as terminated
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for(Threads::iterator it = all_threads.begin(); it != all_threads.end(); it++)
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{
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if((*it)->get_state() == Schedulable::state_future)
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{
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Process& parent = (*it)->get_process();
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if(parent.get_elapsed_time() == (*it)->get_arrival_time())
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(*it)->set_state(Schedulable::state_ready);
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}
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if((*it)->get_total_cpu_time() - (*it)->get_elapsed_time() == 0)
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(*it)->set_state(Schedulable::state_terminated);
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// 3. check for simulation termination (we can directly use threads)
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// for this check, since processes' state is based upon theirs)
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if(simulation_ended &&
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((*it)->get_state() & (Schedulable::state_blocked |
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Schedulable::state_terminated)) == 0)
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simulation_ended = false;
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}
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// /
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// /
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// /
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// (I'M HERE) < * * * * * * * * * * *
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// \
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// \
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// \
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//
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// (is it visible enough for you?)
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try
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{
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// call the policy to sort the queue
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// ...
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}
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catch( UserInterruptException e )
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{
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_policy_manager.init();
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//TODO Do we need to perform some cleanup operation here?
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//TODO Do we need to perform some other cleanup operation here?
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delete new_snapshot;
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// Do we need to update something?
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// Going up unwinding the stack, tell:
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// - SimulationController that everything stopped
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throw;
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}
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concrete_history.append_new_environment(new_snapshot);
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}
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@ -92,6 +92,7 @@ namespace sgpem
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private:
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Scheduler(); //private constructor.
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ReadyQueue _ready_queue;
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PolicyManager& _policy_manager;
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};
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