3 Copyright (C) 2015 ShadowNinja <shadowninja@minetest.net>
5 This program is free software; you can redistribute it and/or modify
6 it under the terms of the GNU Lesser General Public License as published by
7 the Free Software Foundation; either version 2.1 of the License, or
8 (at your option) any later version.
10 This program is distributed in the hope that it will be useful,
11 but WITHOUT ANY WARRANTY; without even the implied warranty of
12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
13 GNU Lesser General Public License for more details.
15 You should have received a copy of the GNU Lesser General Public License along
16 with this program; if not, write to the Free Software Foundation, Inc.,
17 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
20 #ifndef THREADING_ATOMIC_H
21 #define THREADING_ATOMIC_H
24 #if __cplusplus >= 201103L
26 template<typename T> using Atomic = std::atomic<T>;
27 template<typename T> using GenericAtomic = std::atomic<T>;
30 #define GCC_VERSION (__GNUC__ * 100 + __GNUC_MINOR__)
31 #define CLANG_VERSION (__clang_major__ * 100 + __clang_minor__)
32 #if GCC_VERSION >= 407 || CLANG_VERSION >= 302
33 #define ATOMIC_LOAD_GENERIC(T, v) do { \
35 __atomic_load(&(v), &(_val), __ATOMIC_SEQ_CST); \
38 #define ATOMIC_LOAD(T, v) return __atomic_load_n (&(v), __ATOMIC_SEQ_CST)
39 #define ATOMIC_STORE(T, v, x) __atomic_store (&(v), &(x), __ATOMIC_SEQ_CST); return x
40 #define ATOMIC_EXCHANGE(T, v, x) return __atomic_exchange (&(v), &(x), __ATOMIC_SEQ_CST)
41 #define ATOMIC_ADD_EQ(T, v, x) return __atomic_add_fetch (&(v), (x), __ATOMIC_SEQ_CST)
42 #define ATOMIC_SUB_EQ(T, v, x) return __atomic_sub_fetch (&(v), (x), __ATOMIC_SEQ_CST)
43 #define ATOMIC_POST_INC(T, v) return __atomic_fetch_add (&(v), 1, __ATOMIC_SEQ_CST)
44 #define ATOMIC_POST_DEC(T, v) return __atomic_fetch_sub (&(v), 1, __ATOMIC_SEQ_CST)
45 #define ATOMIC_CAS(T, v, e, d) return __atomic_compare_exchange(&(v), &(e), &(d), \
46 false, __ATOMIC_SEQ_CST, __ATOMIC_SEQ_CST)
48 #define ATOMIC_USE_LOCK
49 #include "threading/mutex.h"
51 #define ATOMIC_LOCK_OP(T, op) do { \
57 #define ATOMIC_LOCK_CAS(T, v, e, d) do { \
59 bool _eq = (v == e); \
65 #define ATOMIC_LOAD(T, v) ATOMIC_LOCK_OP(T, v)
66 #define ATOMIC_LOAD_GENERIC(T, v) ATOMIC_LOAD(T, v)
67 #define ATOMIC_STORE(T, v, x) ATOMIC_LOCK_OP(T, v = x)
68 #define ATOMIC_EXCHANGE(T, v, x) do { \
75 #if GCC_VERSION >= 401
76 #define ATOMIC_ADD_EQ(T, v, x) return __sync_add_and_fetch(&(v), (x))
77 #define ATOMIC_SUB_EQ(T, v, x) return __sync_sub_and_fetch(&(v), (x))
78 #define ATOMIC_POST_INC(T, v) return __sync_fetch_and_add(&(v), 1)
79 #define ATOMIC_POST_DEC(T, v) return __sync_fetch_and_sub(&(v), 1)
80 #define ATOMIC_CAS(T, v, e, d) return __sync_bool_compare_and_swap(&(v), &(e), (d))
82 #define ATOMIC_ADD_EQ(T, v, x) ATOMIC_LOCK_OP(T, v += x)
83 #define ATOMIC_SUB_EQ(T, v, x) ATOMIC_LOCK_OP(T, v -= x)
84 #define ATOMIC_POST_INC(T, v) ATOMIC_LOCK_OP(T, v++)
85 #define ATOMIC_POST_DEC(T, v) ATOMIC_LOCK_OP(T, v--)
86 #define ATOMIC_CAS(T, v, e, d) ATOMIC_LOCK_CAS(T, v, e, d)
90 // For usage with integral types.
94 Atomic(const T &v = 0) : m_val(v) {}
96 operator T () { ATOMIC_LOAD(T, m_val); }
98 T exchange(T x) { ATOMIC_EXCHANGE(T, m_val, x); }
99 bool compare_exchange_strong(T &expected, T desired) { ATOMIC_CAS(T, m_val, expected, desired); }
101 T operator = (T x) { ATOMIC_STORE(T, m_val, x); }
102 T operator += (T x) { ATOMIC_ADD_EQ(T, m_val, x); }
103 T operator -= (T x) { ATOMIC_SUB_EQ(T, m_val, x); }
104 T operator ++ () { return *this += 1; }
105 T operator -- () { return *this -= 1; }
106 T operator ++ (int) { ATOMIC_POST_INC(T, m_val); }
107 T operator -- (int) { ATOMIC_POST_DEC(T, m_val); }
110 #ifdef ATOMIC_USE_LOCK
115 // For usage with non-integral types like float for example.
116 // Needed because the other operations aren't provided by gcc
117 // for non-integral types:
118 // https://gcc.gnu.org/onlinedocs/gcc-4.7.0/gcc/_005f_005fatomic-Builtins.html
120 class GenericAtomic {
122 GenericAtomic(const T &v = 0) : m_val(v) {}
124 operator T () { ATOMIC_LOAD_GENERIC(T, m_val); }
126 T exchange(T x) { ATOMIC_EXCHANGE(T, m_val, x); }
127 bool compare_exchange_strong(T &expected, T desired) { ATOMIC_CAS(T, m_val, expected, desired); }
129 T operator = (T x) { ATOMIC_STORE(T, m_val, x); }
132 #ifdef ATOMIC_USE_LOCK