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- Minor modifications to step_forward() 

git-svn-id: svn://svn.gna.org/svn/sgpemv2/trunk@711 3ecf2c5c-341e-0410-92b4-d18e462d057c
This commit is contained in:
tchernobog 2006-07-04 17:17:31 +00:00
parent 401c569a9f
commit 5ab575dffd
2 changed files with 113 additions and 108 deletions
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1
Makefile.am
View File

@ -202,7 +202,6 @@ pkginclude_HEADERS += \
src/backend/process.hh \
src/backend/schedulable.hh \
src/backend/scheduler.hh \
src/backend/slice.hh \
src/backend/sub_request.hh \
src/backend/thread.hh \
src/backend/user_interrupt_exception.hh

232
src/backend/scheduler.cc
View File

@ -116,127 +116,133 @@ Scheduler::get_policy()
void
Scheduler::step_forward(History& history, Policy& cpu_policy) throw(UserInterruptException)
{
// // This very method should be exclusive: no concurrent behaviour, from when we
// // store a readyqueue and policy pointer for the user-policy to retrieve, to when
// // the policy returns
// // TODO: restrict this area to maximise parallelism
// Glib::Mutex::Lock lock(_mutex);
// This very method should be exclusive: no concurrent behaviour, from when we
// store a readyqueue and policy pointer for the user-policy to retrieve, to when
// the policy returns
// TODO: restrict this area to maximise parallelism
Glib::Mutex::Lock lock(_mutex);
// // NOTE: Be sure to read the *ORIGINAL* documentation in the design document for this method!
// 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.
// 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;
//
// // Use an auto_ptr since we've some exceptions in the coming...
// auto_ptr<ConcreteEnvironment> new_snapshot(new ConcreteEnvironment(concrete_history.get_last_environment()));
//
// typedef std::vector<DynamicProcess*> Processes;
// typedef std::vector<DynamicRequest*> Requests;
// typedef std::vector<DynamicSubRequest*> SubRequests;
// typedef std::vector<DynamicThread*> Threads;
//
// Threads all_threads;
// DynamicThread* running_thread = NULL;
ConcreteHistory& concrete_history = (ConcreteHistory&) history;
// collect_threads(new_snapshot->get_processes(), all_threads);
// Use an auto_ptr since we've some exceptions in the coming...
auto_ptr<ConcreteEnvironment> new_snapshot(new ConcreteEnvironment(concrete_history.get_last_environment()));
// // designer + implementer (Matteo) comment follows:
typedef std::vector<DynamicProcess*> Processes;
typedef std::vector<DynamicRequest*> Requests;
typedef std::vector<DynamicSubRequest*> SubRequests;
typedef std::vector<DynamicThread*> Threads;
// for(Threads::iterator it = all_threads.begin(); it != all_threads.end(); it++)
// {
// DynamicThread& current = **it;
//
// // 1. mark future threads as ready, if appropriate
// if(current.get_state() == Schedulable::state_future)
// {
// Process& parent = current.get_process();
// if(parent.get_elapsed_time() == current.get_arrival_time())
// current.set_state(Schedulable::state_ready);
// }
//
// // Save the current running thread for future usage, if it hasn't ended
// // its allotted time
// if(current.get_state() == Schedulable::state_running)
// {
// running_thread = &current; // Even if we change its state to terminated
// // 2. mark threads that used all their allotted time as terminated
// if(current.get_total_cpu_time() - current.get_elapsed_time() == 0)
// current.set_state(Schedulable::state_terminated);
// }
Threads all_threads;
DynamicThread* running_thread = NULL;
// // 3. check for simulation termination (we can directly use threads
// // for this check, since processes' state is based upon threads' one)
// if( /* we still think that */ simulation_ended &&
// (current.get_state() & (Schedulable::state_blocked |
// Schedulable::state_terminated)) == 0)
// simulation_ended = false;
// }
collect_threads(new_snapshot->get_processes(), all_threads);
// // What to do now if the simulation ended?
// designer + implementer (Matteo) comment follows:
for(Threads::iterator it = all_threads.begin(); it != all_threads.end(); it++)
{
DynamicThread& current = **it;
// // FIXME: increasing the time elapsed of the running thread + process
// // should maybe be done here as the first thing, instead than
// // directly when selecting them
// if(running_thread != NULL)
// running_thread->decrease_remaining_time();
//
// // 4a. Requests for the running thread exhausted
// if(running_thread != NULL) {
// Requests& reqs = running_thread->get_dynamic_requests();
//
// // FIXME we lack a way to tell and/or remember for how
// // much a subrequest has been being fulfilled
// // THIS MEANS this part is NOT complete
// // We should check if a request has been fulfilled
// // FIXME If a request was being fulfilled to the running thread,
// // we should decrease the request remaining time here.
// // This is why we kept a ref to the old running thread,
// // even if it was terminated
// if(running_thread->get_state() == Schedulable::state_terminated)
// free_all_resources_of(*running_thread); // this function isn't complete
//
// }
//
// // /
// // /
// // /
// // (I'M HERE) < * * * * * * * * * * *
// // \
// // \
// // \
// //
// // (is it visible enough for you?)
//
// ReadyQueue& ready_queue = new_snapshot->get_sorted_queue();
// prepare_ready_queue(ready_queue);
// try
// {
// // ?. Use the policy to sort the queue
// // FIXME: how does it get the queue?
// cpu_policy.sort_queue();
// }
// catch(UserInterruptException& e)
// {
// _policy_manager.init();
// // ^^^^^
// // Do we need to update something else?
// // Going up unwinding the stack, tell:
// // - the user that the policy sucks
// // - SimulationController that everything stopped
// throw;
// }
//
// // append the new snapshot...
// // ...and remember to release the auto_ptr!
// concrete_history.append_new_environment(new_snapshot.release());
// 1. mark future threads as ready, if appropriate
if(current.get_state() == Schedulable::state_future)
{
Process& parent = current.get_process();
if(parent.get_elapsed_time() == current.get_arrival_time())
current.set_state(Schedulable::state_ready);
}
// Save the current running thread for future usage, if it hasn't ended
// its allotted time
if(current.get_state() == Schedulable::state_running)
{
// increasing the time elapsed of the running thread + process
// should be done here as the first thing, instead than
// directly after selecting them
running_thread->decrease_remaining_time();
running_thread = &current; // Even if we change its state to terminated
// 2. mark threads that used all their allotted time as terminated
if(current.get_total_cpu_time() - current.get_elapsed_time() == 0)
current.set_state(Schedulable::state_terminated);
}
// 3. check for simulation termination (we can directly use threads
// for this check, since processes' state is based upon threads' one)
if( /* we still think that */ simulation_ended &&
(current.get_state() & (Schedulable::state_blocked |
Schedulable::state_terminated)) == 0)
simulation_ended = false;
}
// ---------- FIXME ----------------
// What to do now if the simulation ended?
// 4a. Requests for the running thread exhausted
if(running_thread != NULL) {
Requests& reqs = running_thread->get_dynamic_requests();
if(running_thread->get_state() == Schedulable::state_terminated)
{
// for(Requests::iterator it = reqs.begin();
// FIXME we lack a way to tell and/or remember for how
// much a subrequest has been being fulfilled
// THIS MEANS this part is NOT complete
// We should check if a request has been fulfilled
// FIXME If a request was being fulfilled to the running thread,
// we should decrease the request remaining time here.
// This is why we kept a ref to the old running thread,
// even if it was terminated
free_all_resources_of(*running_thread); // this function isn't complete
}
// /
// /
// /
// (I'M HERE) < * * * * * * * * * * *
// \
// \
// \
//
// (is it visible enough for you?)
ReadyQueue& ready_queue = new_snapshot->get_sorted_queue();
prepare_ready_queue(ready_queue);
try
{
// ?. Use the policy to sort the queue
// FIXME: how does it get the queue?
cpu_policy.sort_queue();
}
catch(UserInterruptException& e)
{
_policy_manager.init();
// ^^^^^
// Do we need to update something else?
// Going up unwinding the stack, tell:
// - the user that the policy sucks
// - SimulationController that everything stopped
throw;
}
// append the new snapshot...
// ...and remember to release the auto_ptr!
concrete_history.append_new_environment(new_snapshot.release());
}