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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 Moses
{
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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