45ef305a1b
- Now CPUPolicy has a callback method for scripting languages, but it is up to derived classes to take mutexes and set the value when needed (maybe we can improve this?) git-svn-id: svn://svn.gna.org/svn/sgpemv2/trunk@862 3ecf2c5c-341e-0410-92b4-d18e462d057c
124 lines
3.6 KiB
C++
124 lines
3.6 KiB
C++
// src/backend/cpu_policy.hh - Copyright 2005, 2006, University
|
|
// of Padova, dept. of Pure and Applied
|
|
// Mathematics
|
|
//
|
|
// This file is part of SGPEMv2.
|
|
//
|
|
// This is free software; you can redistribute it and/or modify
|
|
// it under the terms of the GNU General Public License as published by
|
|
// the Free Software Foundation; either version 2 of the License, or
|
|
// (at your option) any later version.
|
|
//
|
|
// SGPEMv2 is distributed in the hope that it will be useful,
|
|
// but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
|
// GNU General Public License for more details.
|
|
//
|
|
// You should have received a copy of the GNU General Public License
|
|
// along with SGPEMv2; if not, write to the Free Software
|
|
// Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
|
|
|
|
#ifndef CPU_POLICY_HH
|
|
#define CPU_POLICY_HH 1
|
|
|
|
#include "config.h"
|
|
#include "gettext.h"
|
|
|
|
#include "glibmm/ustring.h"
|
|
|
|
#include "policy_parameters.hh"
|
|
#include "user_interrupt_exception.hh"
|
|
#include "malformed_policy_exception.hh"
|
|
|
|
#include <stdexcept>
|
|
|
|
namespace sgpem
|
|
{
|
|
class CPUPolicy;
|
|
|
|
/** \brief
|
|
It's a Strategy wich stay for a scheduling algorithm.
|
|
It implements the related scheduling policy.
|
|
Its goal is, usually, to keep a list of Schedulable objects
|
|
mantained in a ReadyQueue.
|
|
*/
|
|
class SG_DLLEXPORT CPUPolicy
|
|
{
|
|
public:
|
|
virtual ~CPUPolicy();
|
|
|
|
/**
|
|
Initialize the inner components of the policy.
|
|
|
|
Because it's a pure virtual method, must be re-implemented
|
|
in concrete derived classes.
|
|
*/
|
|
virtual void configure() throw(UserInterruptException, MalformedPolicyException) = 0;
|
|
|
|
/**
|
|
Sort the \ref ReadyQueue object that contain all the Schedulable objects
|
|
(Processes, Threads) still active managed by the scheduler.
|
|
|
|
Because it's a pure virtual method, must be re-implemented
|
|
in concrete derived classes.
|
|
*/
|
|
virtual void sort_queue() const throw(UserInterruptException, MalformedPolicyException) = 0;
|
|
|
|
/**
|
|
Gets a string description of the policy.
|
|
|
|
Because it's a pure virtual method, must be re-implemented
|
|
in concrete derived classes.
|
|
\return String description of the policy.
|
|
*/
|
|
virtual Glib::ustring get_description() const = 0;
|
|
|
|
virtual Glib::ustring get_name() const = 0;
|
|
|
|
/**
|
|
Tell if this policy is preemptible.
|
|
|
|
Because it's a pure virtual method, must be re-implemented
|
|
in concrete derived classes.
|
|
\return True if this policy is preemptible.
|
|
*/
|
|
virtual bool is_pre_emptive() const throw(UserInterruptException, MalformedPolicyException) = 0;
|
|
|
|
/**
|
|
Gets the time quantum for the policy.
|
|
|
|
Because it's a pure virtual method, must be re-implemented
|
|
in concrete derived classes.
|
|
\return Time quantum for the policy.
|
|
*/
|
|
virtual int get_time_slice() const throw(UserInterruptException, MalformedPolicyException) = 0;
|
|
|
|
virtual void activate() throw(UserInterruptException, MalformedPolicyException) = 0;
|
|
|
|
virtual void deactivate() = 0;
|
|
|
|
/**
|
|
Gets the parameters related with this policy.
|
|
|
|
\return The policy parameters.
|
|
*/
|
|
PolicyParameters& get_parameters();
|
|
|
|
/** This method is used only as a callback by scripting languages */
|
|
static CPUPolicy* callback_get_policy() throw(std::runtime_error);
|
|
|
|
protected:
|
|
PolicyParameters _parameters;
|
|
|
|
static void set_callback_policy(CPUPolicy* ptr = NULL);
|
|
|
|
private:
|
|
// Used by callback_get_policy:
|
|
static CPUPolicy* _callback_policy;
|
|
|
|
};
|
|
|
|
}//~ namespace sgpem
|
|
|
|
#endif //~ CPU_POLICY_HH
|