56534edb6c
on Window$ unless you change the string "libpyloader" to "pyloader" into main.cc) - Fix Makefile to support module creation and loading - 2DO: - Add a class into backend to load and manage plugins - Install plugins into separate directory - Remove hardcoded paths git-svn-id: svn://svn.gna.org/svn/sgpemv2/trunk@458 3ecf2c5c-341e-0410-92b4-d18e462d057c
129 lines
3.7 KiB
C++
129 lines
3.7 KiB
C++
// src/backend/scheduler.hh - Copyright 2005, 2006, University
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// of Padova, dept. of Pure and Applied
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// Mathematics
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//
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// This file is part of SGPEMv2.
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//
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// This is free software; you can redistribute it and/or modify
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// it under the terms of the GNU General Public License as published by
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// the Free Software Foundation; either version 2 of the License, or
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// (at your option) any later version.
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//
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// SGPEMv2 is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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// GNU General Public License for more details.
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//
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// You should have received a copy of the GNU General Public License
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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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#ifndef SCHEDULER_HH
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#define SCHEDULER_HH 1
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namespace sgpem
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{
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class Scheduler;
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class PolicyManager;
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class Policy;
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}
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#include "config.h"
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#include <limits>
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#include <iostream>
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#include "observed_subject.hh"
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#include "history.hh"
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#include "schedulable_list.hh"
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namespace sgpem
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{
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class Scheduler;
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/** \brief Manages the SchedulableStatus objects, implementing a given policy.
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Class Scheduler manages the schedulable entities which are ready to run,
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ordering them in a queue; it also checks that the current scheduling policy
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is well-defined and does not disrupt the application inner mechanism.
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It is also responsible for the creation and the destruction of some of
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the SchedulableStatus objects (for further details about this, check
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class SchedulableStatus).
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*/
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class SG_DLLEXPORT Scheduler
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{
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public:
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/** The events that may cause the need for updating the scheduling queue
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and/or the running process.
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*/
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enum event
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{
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/**
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The arrival of a newly-created process.
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*/
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event_schedulable_arrival,
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/**
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The termination of the executing process.
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*/
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event_schedulable_termination,
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/**
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The end of the executing process' time quantum.
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*/
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event_end_time_slice
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};
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/** \brief Returns the unique instance of this class, conforming to the Singleton pattern.
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*
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* If Scheduler isn't initialized, creates it. Should be called at least once before
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* starting the Simulation.
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* \return the unique instance of this class, conforming to the Singleton pattern.
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*/
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static Scheduler& get_instance();
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/**
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Returns a pointer to the queue containing all the ready
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schedulable objects (for the policy to sort it).
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\return a pointer to the queue containing all the ready
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schedulable objects (for the policy to sort it).
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*/
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SchedulableList* get_ready_queue();
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/**
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Resets the simulation to the initial state.
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*/
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void reset_status();
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/**
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Generates a new SchedulableList representing the status of the processes
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at the simulation instant next to the current one, and extends the History by
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one instant with it.
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*/
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void step_forward();
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/**
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Sets the policy that will be used to generate the simulation at the next instant.
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\param policy the policy that will be used to generate the simulation at the next instant.
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*/
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/* DISABLED until we don't have PolicyManager::set_policy()
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void set_policy(Policy* policy);
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*/
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/**
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Returns the policy that will be used to generate the simulation at the next instant.
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\return the policy that will be used to generate the simulation at the next instant.
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*/
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Policy& get_policy();
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private:
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Scheduler(); //private constructor.
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static Scheduler* _instance;
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SchedulableList _ready_queue;
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PolicyManager& _policy_manager;
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};
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}//~ namespace sgpem
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#endif //SCHEDULER_HH
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