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070fa3bf OM |
1 | /* |
2 | * This file is part of PowerDNS or dnsdist. | |
3 | * Copyright -- PowerDNS.COM B.V. and its contributors | |
4 | * | |
5 | * This program is free software; you can redistribute it and/or modify | |
6 | * it under the terms of version 2 of the GNU General Public License as | |
7 | * published by the Free Software Foundation. | |
8 | * | |
9 | * In addition, for the avoidance of any doubt, permission is granted to | |
10 | * link this program with OpenSSL and to (re)distribute the binaries | |
11 | * produced as the result of such linking. | |
12 | * | |
13 | * This program is distributed in the hope that it will be useful, | |
14 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
15 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
16 | * GNU General Public License for more details. | |
17 | * | |
18 | * You should have received a copy of the GNU General Public License | |
19 | * along with this program; if not, write to the Free Software | |
20 | * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA. | |
21 | */ | |
22 | #pragma once | |
23 | ||
83b9df32 O |
24 | #include <atomic> |
25 | ||
12b9a1f0 | 26 | #ifndef DISABLE_FALSE_SHARING_PADDING |
070fa3bf OM |
27 | #define CPU_LEVEL1_DCACHE_LINESIZE 64 // Until we know better via configure/getconf |
28 | ||
29 | namespace pdns { | |
30 | template <typename T> | |
31 | class stat_t_trait { | |
32 | public: | |
33 | typedef T base_t; | |
34 | typedef std::atomic<base_t> atomic_t; | |
35 | ||
36 | stat_t_trait() : stat_t_trait(base_t(0)) { | |
37 | } | |
38 | stat_t_trait(const base_t x) { | |
39 | new(&counter) atomic_t(x); | |
40 | } | |
41 | ~stat_t_trait() { | |
42 | reinterpret_cast<atomic_t *>(&counter)->~atomic_t(); | |
43 | } | |
44 | stat_t_trait(const stat_t_trait&) = delete; | |
45 | base_t operator++(int) { | |
46 | return (*reinterpret_cast<atomic_t *>(&counter))++; | |
47 | } | |
48 | base_t operator++() { | |
49 | return ++(*reinterpret_cast<atomic_t *>(&counter)); | |
50 | } | |
51 | base_t operator--(int) { | |
52 | return (*reinterpret_cast<atomic_t *>(&counter))--; | |
53 | } | |
54 | base_t operator--() { | |
55 | return --(*reinterpret_cast<atomic_t *>(&counter)); | |
56 | } | |
57 | base_t operator+=(const stat_t_trait& v) { | |
58 | return *reinterpret_cast<atomic_t *>(&counter) += *reinterpret_cast<const atomic_t *>(&v.counter); | |
59 | } | |
60 | base_t operator-=(const stat_t_trait& v) { | |
61 | return *reinterpret_cast<atomic_t *>(&counter) -= *reinterpret_cast<const atomic_t *>(&v.counter); | |
62 | } | |
63 | base_t load() const { | |
64 | return reinterpret_cast<const atomic_t *>(&counter)->load(); | |
65 | } | |
66 | void store(base_t v) { | |
67 | reinterpret_cast<atomic_t *>(&counter)->store(v); | |
68 | } | |
69 | operator base_t() const { | |
70 | return reinterpret_cast<const atomic_t *>(&counter)->load(); | |
71 | } | |
72 | ||
73 | private: | |
74 | typename std::aligned_storage<sizeof(base_t), CPU_LEVEL1_DCACHE_LINESIZE>::type counter; | |
75 | }; | |
76 | ||
77 | typedef stat_t_trait<uint64_t> stat_t; | |
78 | typedef stat_t_trait<uint32_t> stat32_t; | |
79 | typedef stat_t_trait<uint16_t> stat16_t; | |
80 | } | |
12b9a1f0 RG |
81 | #else |
82 | namespace pdns { | |
83 | using stat_t = std::atomic<uint64_t>; | |
84 | using stat32_t = std::atomic<uint32_t>; | |
85 | using stat16_t = std::atomic<uint16_t>; | |
86 | template <class T> | |
87 | using stat_t_trait = std::atomic<T>; | |
88 | } | |
89 | #endif |