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// Allocators -*- C++ -*-
// Copyright (C) 2001, 2002, 2003 Free Software Foundation, Inc.
//
// This file is part of the GNU ISO C++ Library. This library 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, 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 General Public License for more details.
// You should have received a copy of the GNU General Public License along
// with this library; see the file COPYING. If not, write to the Free
// Software Foundation, 59 Temple Place - Suite 330, Boston, MA 02111-1307,
// USA.
// As a special exception, you may use this file as part of a free software
// library without restriction. Specifically, if other files instantiate
// templates or use macros or inline functions from this file, or you compile
// this file and link it with other files to produce an executable, this
// file does not by itself cause the resulting executable to be covered by
// the GNU General Public License. This exception does not however
// invalidate any other reasons why the executable file might be covered by
// the GNU General Public License.
/*
* Copyright (c) 1996-1997
* Silicon Graphics Computer Systems, Inc.
*
* Permission to use, copy, modify, distribute and sell this software
* and its documentation for any purpose is hereby granted without fee,
* provided that the above copyright notice appear in all copies and
* that both that copyright notice and this permission notice appear
* in supporting documentation. Silicon Graphics makes no
* representations about the suitability of this software for any
* purpose. It is provided "as is" without express or implied warranty.
*/
/** @file ext/debug_allocator.h
* This file is a GNU extension to the Standard C++ Library.
* You should only include this header if you are using GCC 3 or later.
*/
#ifndef _MALLOC_ALLOCATOR_H
#define _MALLOC_ALLOCATOR_H 1
#include <bits/allocator_traits.h>
namespace __gnu_cxx
{
/**
* @if maint
* A malloc-based allocator. Typically slower than the
* __pool_alloc (below). Typically thread-safe and more
* storage efficient. The template argument is unused and is only present
* to permit multiple instantiations (but see __pool_alloc
* for caveats). "SGI" style, plus __set_malloc_handler for OOM conditions.
* @endif
* (See @link Allocators allocators info @endlink for more.)
*/
template<int __inst>
class __malloc_alloc
{
private:
static void* _S_oom_malloc(size_t);
static void (* __malloc_alloc_oom_handler)();
public:
static void*
allocate(size_t __n)
{
void* __result = malloc(__n);
if (__builtin_expect(__result == 0, 0))
__result = _S_oom_malloc(__n);
return __result;
}
static void
deallocate(void* __p, size_t /* __n */)
{ free(__p); }
static void (* __set_malloc_handler(void (*__f)()))()
{
void (* __old)() = __malloc_alloc_oom_handler;
__malloc_alloc_oom_handler = __f;
return __old;
}
};
// malloc_alloc out-of-memory handling
template<int __inst>
void (* __malloc_alloc<__inst>::__malloc_alloc_oom_handler)() = 0;
template<int __inst>
void*
__malloc_alloc<__inst>::
_S_oom_malloc(size_t __n)
{
void (* __my_malloc_handler)();
void* __result;
for (;;)
{
__my_malloc_handler = __malloc_alloc_oom_handler;
if (__builtin_expect(__my_malloc_handler == 0, 0))
__throw_bad_alloc();
(*__my_malloc_handler)();
__result = malloc(__n);
if (__result)
return __result;
}
}
//@{
/** Comparison operators for all of the predifined SGI-style allocators.
* This ensures that __allocator<malloc_alloc> (for example) will work
* correctly. As required, all allocators compare equal.
*/
template<int inst>
inline bool
operator==(const __malloc_alloc<inst>&, const __malloc_alloc<inst>&)
{ return true; }
template<int __inst>
inline bool
operator!=(const __malloc_alloc<__inst>&, const __malloc_alloc<__inst>&)
{ return false; }
//@}
} // namespace __gnu_cxx
namespace std
{
//@{
/// Versions for the predefined "SGI" style allocators.
template<typename _Tp, int __inst>
struct _Alloc_traits<_Tp, __gnu_cxx::__malloc_alloc<__inst> >
{
static const bool _S_instanceless = true;
typedef __gnu_cxx:: __malloc_alloc<__inst> base_alloc_type;
typedef __simple_alloc<_Tp, base_alloc_type> _Alloc_type;
typedef __allocator<_Tp, base_alloc_type> allocator_type;
};
//@}
//@{
/// Versions for the __allocator adaptor used with the predefined
/// "SGI" style allocators.
template<typename _Tp, typename _Tp1, int __inst>
struct _Alloc_traits<_Tp, __allocator<_Tp1,
__gnu_cxx::__malloc_alloc<__inst> > >
{
static const bool _S_instanceless = true;
typedef __gnu_cxx:: __malloc_alloc<__inst> base_alloc_type;
typedef __simple_alloc<_Tp, base_alloc_type> _Alloc_type;
typedef __allocator<_Tp, base_alloc_type> allocator_type;
};
//@}
} // namespace std
#endif
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