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1 | // -*- mode:C++; tab-width:8; c-basic-offset:2; indent-tabs-mode:t -*- |
2 | // vim: ts=8 sw=2 smarttab | |
3 | /* | |
4 | * Ceph - scalable distributed file system | |
5 | * | |
6 | * Copyright (C) 2017 Red Hat, Inc. | |
7 | * | |
8 | * This is free software; you can redistribute it and/or | |
9 | * modify it under the terms of the GNU Lesser General Public | |
10 | * License version 2.1, as published by the Free Software | |
11 | * Foundation. See file COPYING. | |
12 | * | |
13 | */ | |
14 | ||
15 | #ifndef CEPH_COUNTER_H | |
16 | #define CEPH_COUNTER_H | |
17 | ||
181888fb FG |
18 | #include <atomic> |
19 | ||
7c673cae FG |
20 | template <typename T> |
21 | class Counter { | |
22 | public: | |
23 | Counter() { | |
24 | _count()++; | |
25 | _increments()++; | |
26 | } | |
27 | Counter(const Counter &rhs) { | |
28 | _count()++; | |
29 | _increments()++; | |
30 | } | |
31 | Counter(Counter &&rhs) {} | |
32 | ~Counter() { | |
33 | _count()--; | |
34 | } | |
181888fb | 35 | static uint64_t count() { |
7c673cae FG |
36 | return _count(); |
37 | } | |
181888fb | 38 | static uint64_t increments() { |
7c673cae FG |
39 | return _increments(); |
40 | } | |
181888fb | 41 | static uint64_t decrements() { |
7c673cae FG |
42 | return increments()-count(); |
43 | } | |
44 | ||
45 | private: | |
181888fb FG |
46 | static std::atomic<uint64_t> &_count() { |
47 | static std::atomic<uint64_t> c; | |
7c673cae FG |
48 | return c; |
49 | } | |
181888fb FG |
50 | static std::atomic<uint64_t> &_increments() { |
51 | static std::atomic<uint64_t> i; | |
7c673cae FG |
52 | return i; |
53 | } | |
54 | }; | |
55 | ||
56 | #endif |