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87 lines
1.9 KiB
87 lines
1.9 KiB
/* |
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* ZeroTier One - Network Virtualization Everywhere |
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* Copyright (C) 2011-2017 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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#include "NonCopyable.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 : NonCopyable |
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{ |
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public: |
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AtomicCounter() |
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{ |
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_v = 0; |
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} |
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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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#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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