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author | Sergey Vojtovich <svoj@mariadb.org> | 2018-12-26 16:49:11 +0400 |
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committer | Sergey Vojtovich <svoj@mariadb.org> | 2018-12-27 22:46:38 +0400 |
commit | ca83115b3e77ffa696527d82640d5f16810294a2 (patch) | |
tree | 72792e7e9c398adcb04f191f66db1cbf1ef6fce0 /include/my_counter.h | |
parent | 88b7b8199a6061ccdeb2e2a1ac789eb98e02ac92 (diff) | |
download | mariadb-git-ca83115b3e77ffa696527d82640d5f16810294a2.tar.gz |
MDEV-17441 - InnoDB transition to C++11 atomics
Added Atomic_counter class to replace big set of atomic operations uses
in InnoDB, as well as in the server.
Diffstat (limited to 'include/my_counter.h')
-rw-r--r-- | include/my_counter.h | 44 |
1 files changed, 44 insertions, 0 deletions
diff --git a/include/my_counter.h b/include/my_counter.h new file mode 100644 index 00000000000..00fbf8cef91 --- /dev/null +++ b/include/my_counter.h @@ -0,0 +1,44 @@ +#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: + 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 */ |