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https://github.com/ErikasKontenis/SabrehavenServer.git
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63 lines
2.0 KiB
C++
63 lines
2.0 KiB
C++
/**
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* Tibia GIMUD Server - a free and open-source MMORPG server emulator
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* Copyright (C) 2019 Sabrehaven and Mark Samman <mark.samman@gmail.com>
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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 along
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* with this program; if not, write to the Free Software Foundation, Inc.,
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* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
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*/
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#ifndef FS_LOCKFREE_H_8C707AEB7C7235A2FBC5D4EDDF03B008
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#define FS_LOCKFREE_H_8C707AEB7C7235A2FBC5D4EDDF03B008
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#if _MSC_FULL_VER >= 190023918 // Workaround for VS2015 Update 2. Boost.Lockfree is a header-only library, so this should be safe to do.
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#define _ENABLE_ATOMIC_ALIGNMENT_FIX
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#endif
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#include <boost/lockfree/stack.hpp>
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template <typename T, size_t CAPACITY>
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class LockfreePoolingAllocator : public std::allocator<T>
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{
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public:
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template <typename U>
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explicit constexpr LockfreePoolingAllocator(const U&) {}
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typedef T value_type;
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T* allocate(size_t) const {
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T* p; // NOTE: p doesn't have to be initialized
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if (!getFreeList().pop(p)) {
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//Acquire memory without calling the constructor of T
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p = static_cast<T*>(operator new (sizeof(T)));
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}
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return p;
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}
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void deallocate(T* p, size_t) const {
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if (!getFreeList().bounded_push(p)) {
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//Release memory without calling the destructor of T
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//(it has already been called at this point)
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operator delete(p);
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}
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}
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private:
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typedef boost::lockfree::stack<T*, boost::lockfree::capacity<CAPACITY>> FreeList;
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static FreeList& getFreeList() {
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static FreeList freeList;
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return freeList;
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}
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};
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#endif
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