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/*
* Copyright 2009-2011 Fabrice Colin
*
* This program 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.
*
* This program 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 this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
*/
#ifndef _MEMORY_H
#define _MEMORY_H
#include "config.h"
#include <execinfo.h>
#include <string>
#include <iostream>
#ifdef HAVE_UMEM_H
#include <umem.h>
struct umem_allocator_tag
{
};
/// Based on an example gven at http://www.ddj.com/cpp/184403759
template <typename T>
class umem_allocator
{
public:
typedef T value_type;
typedef value_type* pointer;
typedef const value_type* const_pointer;
typedef value_type& reference;
typedef const value_type& const_reference;
typedef typename std::size_t size_type;
typedef typename std::ptrdiff_t difference_type;
template <typename U>
struct rebind
{
typedef umem_allocator<U> other;
};
umem_allocator()
{
}
template <typename U>
umem_allocator(const umem_allocator<U> &)
{
}
~umem_allocator()
{
}
static pointer address(reference x)
{
return &x;
}
static const_pointer address(const_reference x)
{
return x;
}
static size_type max_size()
{
return (std::numeric_limits<size_type>::max)();
}
static void construct(pointer p, const value_type &t)
{
new(p) T(t);
}
static void destroy(pointer p)
{
p->~T();
// Avoid unused variable warning
(void)p;
}
bool operator==(const umem_allocator &) const
{
return true;
}
bool operator!=(const umem_allocator &) const
{
return false;
}
static pointer allocate(size_type n)
{
#ifdef DEBUG
std::cout << "umem_allocator::allocate: allocating " << n << std::endl;
#endif
void *ret = umem_alloc(n * sizeof(T), UMEM_DEFAULT);
if (ret == NULL)
{
throw std::bad_alloc();
}
return static_cast<pointer>(ret);
}
static pointer allocate(const size_type n, const void *const)
{
return allocate(n);
}
static void deallocate(pointer p, size_type n)
{
if ((p == NULL) ||
(n == 0))
{
return;
}
#ifdef DEBUG
std::cout << "umem_allocator::deallocate: freeing " << n << std::endl;
#endif
umem_free(static_cast<void*>(p), n * sizeof(T));
}
};
/// Specialization for void.
template<>
class umem_allocator<void>
{
typedef void value_type;
typedef void* pointer;
typedef const void* const_pointer;
template <class U>
struct rebind
{
typedef umem_allocator<U> other;
};
};
#else
#ifdef HAVE_EXT_MALLOC_ALLOCATOR_H
#include <ext/malloc_allocator.h>
#endif
#endif
#ifdef HAVE_BOOST_POOL_POOLFWD_HPP
// This header should be available if poolfwd.hpp is
#include <boost/pool/pool_alloc.hpp>
#endif
#include "Visibility.h"
#ifdef HAVE_BOOST_POOL_POOLFWD_HPP
#ifdef HAVE_UMEM_H
// Memory pool with umem
typedef boost::pool_allocator<char,
umem_allocator> filter_allocator;
#else
// Memory pool with malloc (glibc's or any other implementation)
typedef boost::pool_allocator<char,
boost::default_user_allocator_malloc_free,
boost::details::pool::default_mutex, 131072> filter_allocator;
#endif
typedef std::basic_string<char, std::char_traits<char>, filter_allocator > dstring;
#else
#ifdef HAVE_UMEM_H
// No memory pool, plain umem
typedef umem_allocator<char> filter_allocator;
typedef std::basic_string<char, std::char_traits<char>, filter_allocator > dstring;
#else
#ifdef HAVE_EXT_MALLOC_ALLOCATOR_H
// No memory pool, plain malloc (glibc's or any other implementation)
typedef __gnu_cxx::malloc_allocator<char> filter_allocator;
typedef std::basic_string<char, std::char_traits<char>, filter_allocator > dstring;
#else
// No memory pool, default STL allocator
typedef std::allocator<char> filter_allocator;
typedef std::string dstring;
#endif
#endif
#endif
/// Memory usage related utilities.
class PINOT_EXPORT Memory
{
public:
/// Allocates a buffer.
static char *allocateBuffer(off_t length);
/// Frees a buffer.
static void freeBuffer(char *pBuffer, off_t length);
/// Returns the number of bytes in use.
static int getUsage(void);
/// Hints to the OS it can reclaim unused memory.
static void reclaim(void);
protected:
Memory();
};
#endif // _MEMORY_H
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