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https://github.com/rakshasa/rtorrent.git
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rakshasa
7e554e8b1b
git-svn-id: svn://rakshasa.no/libtorrent/trunk/rtorrent@1189 e378c898-3ddf-0310-93e7-cc216c733640
111 lines
3.6 KiB
C++
111 lines
3.6 KiB
C++
// rak - Rakshasa's toolbox
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// Copyright (C) 2005-2007, Jari Sundell
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//
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// This program is free software; you can redistribute it and/or modify
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// it under the terms of the GNU General Public License as published by
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// the Free Software Foundation; either version 2 of the License, or
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// (at your option) any later version.
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//
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// This program is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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// GNU General Public License for more details.
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//
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// You should have received a copy of the GNU General Public License
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// along with this program; if not, write to the Free Software
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// Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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//
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// In addition, as a special exception, the copyright holders give
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// permission to link the code of portions of this program with the
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// OpenSSL library under certain conditions as described in each
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// individual source file, and distribute linked combinations
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// including the two.
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//
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// You must obey the GNU General Public License in all respects for
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// all of the code used other than OpenSSL. If you modify file(s)
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// with this exception, you may extend this exception to your version
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// of the file(s), but you are not obligated to do so. If you do not
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// wish to do so, delete this exception statement from your version.
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// If you delete this exception statement from all source files in the
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// program, then also delete it here.
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//
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// Contact: Jari Sundell <jaris@ifi.uio.no>
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//
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// Skomakerveien 33
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// 3185 Skoppum, NORWAY
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// Some allocators for cacheline aligned chunks of memory, etc.
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#ifndef RAK_ALLOCATORS_H
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#define RAK_ALLOCATORS_H
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#include <cstddef>
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#include <limits>
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#include <stdlib.h>
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#include <sys/types.h>
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namespace rak {
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template <class T = void*>
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class cacheline_allocator {
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public:
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typedef size_t size_type;
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typedef ptrdiff_t difference_type;
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typedef T* pointer;
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typedef const T* const_pointer;
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typedef const void* const_void_pointer;
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typedef T& reference;
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typedef const T& const_reference;
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typedef T value_type;
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cacheline_allocator() throw() { }
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cacheline_allocator(const cacheline_allocator&) throw() { }
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template <class U>
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cacheline_allocator(const cacheline_allocator<U>&) throw() { }
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~cacheline_allocator() throw() { }
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template <class U>
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struct rebind { typedef cacheline_allocator<U> other; };
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// return address of values
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pointer address (reference value) const { return &value; }
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const_pointer address (const_reference value) const { return &value; }
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size_type max_size () const throw() { return std::numeric_limits<size_t>::max() / sizeof(T); }
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pointer allocate(size_type num, const_void_pointer hint = 0) { return alloc_size(num*sizeof(T)); }
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static pointer alloc_size(size_type size) {
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pointer ptr = NULL;
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int __UNUSED result = posix_memalign((void**)&ptr, LT_SMP_CACHE_BYTES, size);
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return ptr;
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}
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void construct (pointer p, const T& value) { new((void*)p)T(value); }
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void destroy (pointer p) { p->~T(); }
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void deallocate (pointer p, size_type num) { free((void*)p); }
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};
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template <class T1, class T2>
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bool operator== (const cacheline_allocator<T1>&, const cacheline_allocator<T2>&) throw() {
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return true;
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}
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template <class T1, class T2>
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bool operator!= (const cacheline_allocator<T1>&, const cacheline_allocator<T2>&) throw() {
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return false;
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}
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}
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//
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// Operator new with custom allocators:
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//
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template <typename T>
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void* operator new(size_t s, rak::cacheline_allocator<T> a) { return a.alloc_size(s); }
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#endif // namespace rak
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