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// $Id$
// vim:tabstop=2
/***********************************************************************
Moses - factored phrase-based language decoder
Copyright (C) 2006 University of Edinburgh
This library is free software; you can redistribute it and/or
modify it under the terms of the GNU Lesser General Public
License as published by the Free Software Foundation; either
version 2.1 of the License, or (at your option) any later version.
This library 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
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public
License along with this library; if not, write to the Free Software
Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
***********************************************************************/
#ifndef moses_MmapAllocator_h
#define moses_MmapAllocator_h
#include <limits>
#include <iostream>
#include <cstdio>
#include <unistd.h>
#if defined(_WIN32) || defined(_WIN64)
#include <windows.h>
#include <io.h>
#else
#include <sys/mman.h>
#endif
#include "util/mmap.hh"
namespace Moses2
{
template<class T>
class MmapAllocator
{
protected:
std::FILE* m_file_ptr;
size_t m_file_desc;
size_t m_page_size;
size_t m_map_size;
char* m_data_ptr;
size_t m_data_offset;
bool m_fixed;
size_t* m_count;
public:
typedef T value_type;
typedef T* pointer;
typedef const T* const_pointer;
typedef T& reference;
typedef const T& const_reference;
typedef std::size_t size_type;
typedef std::ptrdiff_t difference_type;
MmapAllocator() throw () :
m_file_ptr(std::tmpfile()), m_file_desc(fileno(m_file_ptr)), m_page_size(
util::SizePage()), m_map_size(0), m_data_ptr(0), m_data_offset(0), m_fixed(
false), m_count(new size_t(0))
{
}
MmapAllocator(std::FILE* f_ptr) throw () :
m_file_ptr(f_ptr), m_file_desc(fileno(m_file_ptr)), m_page_size(
util::SizePage()), m_map_size(0), m_data_ptr(0), m_data_offset(0), m_fixed(
false), m_count(new size_t(0))
{
}
MmapAllocator(std::FILE* f_ptr, size_t data_offset) throw () :
m_file_ptr(f_ptr), m_file_desc(fileno(m_file_ptr)), m_page_size(
util::SizePage()), m_map_size(0), m_data_ptr(0), m_data_offset(
data_offset), m_fixed(true), m_count(new size_t(0))
{
}
MmapAllocator(std::string fileName) throw () :
m_file_ptr(std::fopen(fileName.c_str(), "wb+")), m_file_desc(
fileno(m_file_ptr)), m_page_size(util::SizePage()), m_map_size(0), m_data_ptr(
0), m_data_offset(0), m_fixed(false), m_count(new size_t(0))
{
}
MmapAllocator(const MmapAllocator& c) throw () :
m_file_ptr(c.m_file_ptr), m_file_desc(c.m_file_desc), m_page_size(
c.m_page_size), m_map_size(c.m_map_size), m_data_ptr(c.m_data_ptr), m_data_offset(
c.m_data_offset), m_fixed(c.m_fixed), m_count(c.m_count)
{
(*m_count)++;
}
~MmapAllocator() throw ()
{
if (m_data_ptr && *m_count == 0) {
util::UnmapOrThrow(m_data_ptr, m_map_size);
if (!m_fixed && std::ftell(m_file_ptr) != -1) std::fclose(m_file_ptr);
}
(*m_count)--;
}
template<class U>
struct rebind
{
typedef MmapAllocator<U> other;
};
pointer address(reference value) const
{
return &value;
}
const_pointer address(const_reference value) const
{
return &value;
}
size_type max_size() const throw ()
{
return std::numeric_limits<size_t>::max() / sizeof(value_type);
}
pointer allocate(size_type num, const void* = 0)
{
m_map_size = num * sizeof(T);
#if defined(_WIN32) || defined(_WIN64)
// On Windows, MAP_SHARED is not defined and MapOrThrow ignores the flags.
const int map_shared = 0;
#else
const int map_shared = MAP_SHARED;
#endif
if (!m_fixed) {
size_t read = 0;
read += ftruncate(m_file_desc, m_map_size);
m_data_ptr = (char *) util::MapOrThrow(m_map_size, true, map_shared,
false, m_file_desc, 0);
return (pointer) m_data_ptr;
}
else {
const size_t map_offset = (m_data_offset / m_page_size) * m_page_size;
const size_t relative_offset = m_data_offset - map_offset;
const size_t adjusted_map_size = m_map_size + relative_offset;
m_data_ptr = (char *) util::MapOrThrow(adjusted_map_size, false,
map_shared, false, m_file_desc, map_offset);
return (pointer) (m_data_ptr + relative_offset);
}
}
void deallocate(pointer p, size_type num)
{
if (!m_fixed) {
util::UnmapOrThrow(p, num * sizeof(T));
}
else {
const size_t map_offset = (m_data_offset / m_page_size) * m_page_size;
const size_t relative_offset = m_data_offset - map_offset;
const size_t adjusted_map_size = m_map_size + relative_offset;
util::UnmapOrThrow((pointer) ((char*) p - relative_offset),
adjusted_map_size);
}
}
void construct(pointer p, const T& value)
{
if (!m_fixed) new (p) value_type(value);
}
void destroy(pointer p)
{
if (!m_fixed) p->~T();
}
template<class T1, class T2>
friend bool operator==(const MmapAllocator<T1>&,
const MmapAllocator<T2>&) throw ();
template<class T1, class T2>
friend bool operator!=(const MmapAllocator<T1>&,
const MmapAllocator<T2>&) throw ();
};
template<class T1, class T2>
bool operator==(const MmapAllocator<T1>& a1,
const MmapAllocator<T2>& a2) throw ()
{
bool equal = true;
equal &= a1.m_file_ptr == a2.m_file_ptr;
equal &= a1.m_file_desc == a2.m_file_desc;
equal &= a1.m_page_size == a2.m_page_size;
equal &= a1.m_map_size == a2.m_map_size;
equal &= a1.m_data_ptr == a2.m_data_ptr;
equal &= a1.m_data_offset == a2.m_data_offset;
equal &= a1.m_fixed == a2.m_fixed;
return equal;
}
template<class T1, class T2>
bool operator!=(const MmapAllocator<T1>& a1,
const MmapAllocator<T2>& a2) throw ()
{
return !(a1 == a2);
}
}
#endif
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