文件操作 - my_counter.h

文件: /usr/include/mysql/server/private/my_counter.h

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#ifndef MY_COUNTER_H_INCLUDED
#define MY_COUNTER_H_INCLUDED
/*
   Copyright (C) 2018 MariaDB Foundation

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; version 2 of the License.

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, write to the Free Software
   Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301  USA
*/

#include <atomic>

template <typename Type> class Atomic_counter
{
  std::atomic<Type> m_counter;

Type add(Type i) { return m_counter.fetch_add(i, std::memory_order_relaxed); }
  Type sub(Type i) { return m_counter.fetch_sub(i, std::memory_order_relaxed); }

public:
  Atomic_counter(const Atomic_counter<Type> &rhs)
  { m_counter.store(rhs, std::memory_order_relaxed); }
  Atomic_counter(Type val): m_counter(val) {}
  Atomic_counter() = default;

Type operator++(int) { return add(1); }
  Type operator--(int) { return sub(1); }

Type operator++() { return add(1) + 1; }
  Type operator--() { return sub(1) - 1; }

Type operator+=(const Type i) { return add(i) + i; }
  Type operator-=(const Type i) { return sub(i) - i; }

operator Type() const { return m_counter.load(std::memory_order_relaxed); }
  Type operator=(const Type val)
  { m_counter.store(val, std::memory_order_relaxed); return val; }
};
#endif /* MY_COUNTER_H_INCLUDED */

文件操作 - my_counter.h

文件: /usr/include/mysql/server/private/my_counter.h

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