mirror of
https://github.com/zerotier/ZeroTierOne.git
synced 2024-12-24 15:16:40 +00:00
74 lines
1.3 KiB
C++
74 lines
1.3 KiB
C++
/*
|
|
* Copyright (c)2019 ZeroTier, Inc.
|
|
*
|
|
* Use of this software is governed by the Business Source License included
|
|
* in the LICENSE.TXT file in the project's root directory.
|
|
*
|
|
* Change Date: 2023-01-01
|
|
*
|
|
* On the date above, in accordance with the Business Source License, use
|
|
* of this software will be governed by version 2.0 of the Apache License.
|
|
*/
|
|
/****/
|
|
|
|
#ifndef ZT_ATOMICCOUNTER_HPP
|
|
#define ZT_ATOMICCOUNTER_HPP
|
|
|
|
#include "Constants.hpp"
|
|
|
|
#ifndef __GNUC__
|
|
#include <atomic>
|
|
#endif
|
|
|
|
namespace ZeroTier {
|
|
|
|
/**
|
|
* Simple atomic counter supporting increment and decrement
|
|
*/
|
|
class AtomicCounter
|
|
{
|
|
public:
|
|
ZT_ALWAYS_INLINE AtomicCounter() { _v = 0; }
|
|
|
|
ZT_ALWAYS_INLINE int load() const
|
|
{
|
|
#ifdef __GNUC__
|
|
return __sync_or_and_fetch(const_cast<int *>(&_v),0);
|
|
#else
|
|
return _v.load();
|
|
#endif
|
|
}
|
|
|
|
ZT_ALWAYS_INLINE int operator++()
|
|
{
|
|
#ifdef __GNUC__
|
|
return __sync_add_and_fetch(&_v,1);
|
|
#else
|
|
return ++_v;
|
|
#endif
|
|
}
|
|
|
|
ZT_ALWAYS_INLINE int operator--()
|
|
{
|
|
#ifdef __GNUC__
|
|
return __sync_sub_and_fetch(&_v,1);
|
|
#else
|
|
return --_v;
|
|
#endif
|
|
}
|
|
|
|
private:
|
|
inline AtomicCounter(const AtomicCounter &) {}
|
|
inline const AtomicCounter &operator=(const AtomicCounter &) { return *this; }
|
|
|
|
#ifdef __GNUC__
|
|
int _v;
|
|
#else
|
|
std::atomic_int _v;
|
|
#endif
|
|
};
|
|
|
|
} // namespace ZeroTier
|
|
|
|
#endif
|