mirror of
https://github.com/zerotier/ZeroTierOne.git
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74 lines
1.3 KiB
C++
74 lines
1.3 KiB
C++
/*
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* Copyright (c)2019 ZeroTier, Inc.
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*
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* Use of this software is governed by the Business Source License included
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* in the LICENSE.TXT file in the project's root directory.
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*
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* Change Date: 2023-01-01
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*
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* On the date above, in accordance with the Business Source License, use
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* of this software will be governed by version 2.0 of the Apache License.
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*/
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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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ZT_ALWAYS_INLINE AtomicCounter() { _v = 0; }
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ZT_ALWAYS_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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ZT_ALWAYS_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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ZT_ALWAYS_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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inline AtomicCounter(const AtomicCounter &) {}
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inline 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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