mirror of
https://github.com/zerotier/ZeroTierOne.git
synced 2024-12-19 04:57:53 +00:00
87 lines
1.9 KiB
C++
87 lines
1.9 KiB
C++
/*
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* ZeroTier One - Network Virtualization Everywhere
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* Copyright (C) 2011-2019 ZeroTier, Inc. https://www.zerotier.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 3 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, see <http://www.gnu.org/licenses/>.
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*
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* --
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*
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* You can be released from the requirements of the license by purchasing
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* a commercial license. Buying such a license is mandatory as soon as you
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* develop commercial closed-source software that incorporates or links
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* directly against ZeroTier software without disclosing the source code
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* of your own application.
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*/
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#ifndef ZT_ATOMICCOUNTER_HPP
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#define ZT_ATOMICCOUNTER_HPP
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#include "Constants.hpp"
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#ifndef __GNUC__
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#include <atomic>
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#endif
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namespace ZeroTier {
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/**
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* Simple atomic counter supporting increment and decrement
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*/
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class AtomicCounter
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{
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public:
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AtomicCounter() { _v = 0; }
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inline int load() const
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{
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#ifdef __GNUC__
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return __sync_or_and_fetch(const_cast<int *>(&_v),0);
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#else
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return _v.load();
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#endif
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}
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inline int operator++()
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{
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#ifdef __GNUC__
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return __sync_add_and_fetch(&_v,1);
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#else
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return ++_v;
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#endif
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}
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inline int operator--()
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{
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#ifdef __GNUC__
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return __sync_sub_and_fetch(&_v,1);
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#else
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return --_v;
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#endif
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}
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private:
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AtomicCounter(const AtomicCounter &) {}
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const AtomicCounter &operator=(const AtomicCounter &) { return *this; }
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#ifdef __GNUC__
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int _v;
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#else
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std::atomic_int _v;
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#endif
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};
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} // namespace ZeroTier
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#endif
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