mirror of https://github.com/minetest/minetest.git
97 lines
3.4 KiB
C++
97 lines
3.4 KiB
C++
/*
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Minetest
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Copyright (C) 2015 ShadowNinja <shadowninja@minetest.net>
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU Lesser General Public License as published by
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the Free Software Foundation; either version 2.1 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public License along
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with this program; if not, write to the Free Software Foundation, Inc.,
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51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
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*/
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#ifndef THREADING_ATOMIC_H
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#define THREADING_ATOMIC_H
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#if __cplusplus >= 201103L
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#include <atomic>
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template<typename T> using Atomic = std::atomic<T>;
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#else
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#define GCC_VERSION (__GNUC__ * 100 + __GNUC_MINOR__)
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#define CLANG_VERSION (__clang_major__ * 100 + __clang_minor__)
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#if GCC_VERSION >= 407 || CLANG_VERSION >= 302
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#define ATOMIC_LOAD(T, v) return __atomic_load_n(&(v), __ATOMIC_SEQ_CST)
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#define ATOMIC_STORE(T, v, x) __atomic_store (&(v), &(x), __ATOMIC_SEQ_CST); return x
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#define ATOMIC_ADD_EQ(T, v, x) return __atomic_add_fetch(&(v), (x), __ATOMIC_SEQ_CST)
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#define ATOMIC_SUB_EQ(T, v, x) return __atomic_sub_fetch(&(v), (x), __ATOMIC_SEQ_CST)
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#define ATOMIC_POST_INC(T, v) return __atomic_fetch_add(&(v), 1, __ATOMIC_SEQ_CST)
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#define ATOMIC_POST_DEC(T, v) return __atomic_fetch_sub(&(v), 1, __ATOMIC_SEQ_CST)
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#else
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#define ATOMIC_USE_LOCK
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#include "threading/mutex.h"
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#define ATOMIC_LOCK_OP(T, op) do { \
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mutex.lock(); \
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T _val = (op); \
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mutex.unlock(); \
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return _val; \
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} while (0)
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#define ATOMIC_LOAD(T, v) \
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if (sizeof(T) <= sizeof(void*)) return v; \
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else ATOMIC_LOCK_OP(T, v);
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#define ATOMIC_STORE(T, v, x) \
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if (sizeof(T) <= sizeof(void*)) return v = x; \
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else ATOMIC_LOCK_OP(T, v = x);
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# if GCC_VERSION >= 401
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#define ATOMIC_ADD_EQ(T, v, x) return __sync_add_and_fetch(&(v), (x))
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#define ATOMIC_SUB_EQ(T, v, x) return __sync_sub_and_fetch(&(v), (x))
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#define ATOMIC_POST_INC(T, v) return __sync_fetch_and_add(&(v), 1)
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#define ATOMIC_POST_DEC(T, v) return __sync_fetch_and_sub(&(v), 1)
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# else
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#define ATOMIC_ADD_EQ(T, v, x) ATOMIC_LOCK_OP(T, v += x)
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#define ATOMIC_SUB_EQ(T, v, x) ATOMIC_LOCK_OP(T, v -= x)
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#define ATOMIC_POST_INC(T, v) ATOMIC_LOCK_OP(T, v++)
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#define ATOMIC_POST_DEC(T, v) ATOMIC_LOCK_OP(T, v--)
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# endif
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#endif
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template<typename T>
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class Atomic
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{
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// Like C++11 std::enable_if, but defaults to char since C++03 doesn't support SFINAE
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template<bool B, typename T_ = void> struct enable_if { typedef char type; };
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template<typename T_> struct enable_if<true, T_> { typedef T_ type; };
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public:
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Atomic(const T &v=0) : val(v) {}
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operator T () { ATOMIC_LOAD(T, val); }
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T operator = (T x) { ATOMIC_STORE(T, val, x); }
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T operator += (T x) { ATOMIC_ADD_EQ(T, val, x); }
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T operator -= (T x) { ATOMIC_SUB_EQ(T, val, x); }
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T operator ++ () { return *this += 1; }
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T operator -- () { return *this -= 1; }
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T operator ++ (int) { ATOMIC_POST_INC(T, val); }
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T operator -- (int) { ATOMIC_POST_DEC(T, val); }
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private:
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volatile T val;
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#ifdef ATOMIC_USE_LOCK
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typename enable_if<sizeof(T) <= sizeof(void*), Mutex>::type mutex;
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#endif
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};
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#endif // C++11
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#endif
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