mirror of
https://github.com/zerotier/ZeroTierOne.git
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123 lines
2.4 KiB
C++
123 lines
2.4 KiB
C++
/*
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* ZeroTier One - Global Peer to Peer Ethernet
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* Copyright (C) 2011-2015 ZeroTier Networks
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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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* ZeroTier may be used and distributed under the terms of the GPLv3, which
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* are available at: http://www.gnu.org/licenses/gpl-3.0.html
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*
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* If you would like to embed ZeroTier into a commercial application or
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* redistribute it in a modified binary form, please contact ZeroTier Networks
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* LLC. Start here: http://www.zerotier.com/
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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 "Mutex.hpp"
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#include "NonCopyable.hpp"
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#ifdef __WINDOWS__
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// <atomic> will replace this whole class eventually once it's ubiquitous
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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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/**
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* Initialize counter at zero
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*/
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AtomicCounter()
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throw()
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{
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_v = 0;
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}
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inline operator int() const
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throw()
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{
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#ifdef __GNUC__
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return __sync_or_and_fetch(const_cast <volatile int *>(&_v),0);
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#else
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#ifdef __WINDOWS__
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return (int)_v;
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#else
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_l.lock();
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int v = _v;
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_l.unlock();
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return v;
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#endif
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#endif
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}
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inline int operator++()
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throw()
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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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#ifdef __WINDOWS__
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return ++_v;
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#else
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_l.lock();
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int v = ++_v;
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_l.unlock();
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return v;
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#endif
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#endif
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}
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inline int operator--()
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throw()
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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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#ifdef __WINDOWS__
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return --_v;
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#else
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_l.lock();
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int v = --_v;
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_l.unlock();
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return v;
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#endif
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#endif
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}
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private:
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#ifdef __WINDOWS__
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std::atomic_int _v;
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#else
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int _v;
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#ifndef __GNUC__
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#warning Neither __WINDOWS__ nor __GNUC__ so AtomicCounter using Mutex
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Mutex _l;
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#endif
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#endif
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};
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} // namespace ZeroTier
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#endif
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