/* * ZeroTier One - Network Virtualization Everywhere * Copyright (C) 2011-2017 ZeroTier, Inc. https://www.zerotier.com/ * * This program is free software: you can redistribute it and/or modify * it under the terms of the GNU General Public License as published by * the Free Software Foundation, either version 3 of the License, or * (at your option) any later version. * * This program is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the * GNU General Public License for more details. * * You should have received a copy of the GNU General Public License * along with this program. If not, see . * * -- * * You can be released from the requirements of the license by purchasing * a commercial license. Buying such a license is mandatory as soon as you * develop commercial closed-source software that incorporates or links * directly against ZeroTier software without disclosing the source code * of your own application. */ #ifndef ZT_ATOMICCOUNTER_HPP #define ZT_ATOMICCOUNTER_HPP #include "Constants.hpp" #include "NonCopyable.hpp" #ifndef __GNUC__ #include #endif namespace ZeroTier { /** * Simple atomic counter supporting increment and decrement */ class AtomicCounter : NonCopyable { public: AtomicCounter() { _v = 0; } inline int load() const { #ifdef __GNUC__ return __sync_or_and_fetch(const_cast(&_v),0); #else return _v.load(); #endif } inline int operator++() { #ifdef __GNUC__ return __sync_add_and_fetch(&_v,1); #else return ++_v; #endif } inline int operator--() { #ifdef __GNUC__ return __sync_sub_and_fetch(&_v,1); #else return --_v; #endif } private: #ifdef __GNUC__ int _v; #else std::atomic_int _v; #endif }; } // namespace ZeroTier #endif