sgpemv2/plugins/pyloader/python_policy_manager.cc

116 lines
2.9 KiB
C++

// src/backend/pyloader/python_policy_manager.cc - 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
#include "python_policy_manager.hh"
#include "global_settings.hh"
#include <Python.h>
#include <glibmm/ustring.h>
#include <glibmm/timer.h>
#include <algorithm>
#include <cassert>
#include <functional>
#include <iostream>
#include <string>
#include <unistd.h>
using namespace sgpem;
// Concatenate a string with all the policies directories
struct pol_dirs_concat : public std::unary_function<void, const Glib::ustring&>
{
public:
pol_dirs_concat(Glib::ustring& cat) : _cat(cat) {}
void operator()(const Glib::ustring& add)
{
// Please note that this string will end finishing with
// and additional ","!
_cat += "'" + add + "', ";
}
private:
Glib::ustring& _cat;
};
//static object
PythonPolicyManager* PythonPolicyManager::_instance = NULL;
PythonPolicyManager::PythonPolicyManager()
: _initialized(false)
{
PyEval_InitThreads();
}
PythonPolicyManager* const
PythonPolicyManager::get_instance()
{
if(!_instance)
_instance = new PythonPolicyManager();
return _instance;
}
Policy&
PythonPolicyManager::get_policy()
{
// FIXME : assumes that _python_policy is always != NULL!
return *_python_policy;
}
void
PythonPolicyManager::init()
{
if(_initialized)
// No-op
return;
Py_Initialize();
_initialized = true;
// The following lines are ugly, but necessary if we use
// non-standard installation directories. Theoretically,
// it should be up to the user to set correct
// environment variables.
// FIXME: find better way to achieve this.
Glib::ustring importdirs = "import sys\n"
"sys.path[:0] = [ ";
for_each(GlobalSettings::instance().policies_dir_begin(),
GlobalSettings::instance().policies_dir_end(),
pol_dirs_concat(importdirs));
importdirs += " '" SHAREDIR "' ]\n";
PyRun_SimpleString(importdirs.c_str());
// Okay, here we go.
// Black magic at work.
// FIXME : Hardcoded policy name
char* policy_name = "fcfs";
//char* policy_name = "sjf";
_python_policy = std::auto_ptr<PythonPolicy>(new PythonPolicy(policy_name));
}