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100 lines
2.4 KiB
C++
100 lines
2.4 KiB
C++
// Copyright 2013 Dolphin Emulator Project
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// Licensed under GPLv2
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// Refer to the license.txt file included.
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// IWYU pragma: private, include "Common/Atomic.h"
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#pragma once
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#include "Common/Common.h"
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// Atomic operations are performed in a single step by the CPU. It is
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// impossible for other threads to see the operation "half-done."
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//
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// Some atomic operations can be combined with different types of memory
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// barriers called "Acquire semantics" and "Release semantics", defined below.
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//
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// Acquire semantics: Future memory accesses cannot be relocated to before the
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// operation.
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//
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// Release semantics: Past memory accesses cannot be relocated to after the
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// operation.
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//
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// These barriers affect not only the compiler, but also the CPU.
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namespace Common
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{
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inline void AtomicAdd(volatile u32& target, u32 value)
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{
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__sync_add_and_fetch(&target, value);
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}
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inline void AtomicAnd(volatile u32& target, u32 value)
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{
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__sync_and_and_fetch(&target, value);
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}
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inline void AtomicDecrement(volatile u32& target)
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{
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__sync_add_and_fetch(&target, -1);
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}
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inline void AtomicIncrement(volatile u32& target)
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{
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__sync_add_and_fetch(&target, 1);
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}
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inline void AtomicOr(volatile u32& target, u32 value)
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{
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__sync_or_and_fetch(&target, value);
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}
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// Support clang versions older than 3.4.
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#if __clang__ && !__has_feature(cxx_atomic)
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template <typename T>
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_Atomic(T)* ToC11Atomic(volatile T* loc)
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{
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return (_Atomic(T)*) loc;
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}
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#define __atomic_load_n(p, m) __c11_atomic_load(ToC11Atomic(p), m)
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#define __atomic_store_n(p, v, m) __c11_atomic_store(ToC11Atomic(p), v, m)
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#define __atomic_exchange_n(p, v, m) __c11_atomic_exchange(ToC11Atomic(p), v, m)
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#endif
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#ifndef __ATOMIC_RELAXED
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#error __ATOMIC_RELAXED not defined; your compiler version is too old.
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#endif
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template <typename T>
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inline T AtomicLoad(volatile T& src)
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{
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return __atomic_load_n(&src, __ATOMIC_RELAXED);
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}
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template <typename T>
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inline T AtomicLoadAcquire(volatile T& src)
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{
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return __atomic_load_n(&src, __ATOMIC_ACQUIRE);
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}
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template <typename T, typename U>
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inline void AtomicStore(volatile T& dest, U value)
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{
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__atomic_store_n(&dest, value, __ATOMIC_RELAXED);
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}
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template <typename T, typename U>
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inline void AtomicStoreRelease(volatile T& dest, U value)
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{
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__atomic_store_n(&dest, value, __ATOMIC_RELEASE);
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}
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template <typename T, typename U>
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inline T* AtomicExchangeAcquire(T* volatile& loc, U newval)
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{
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return __atomic_exchange_n(&loc, newval, __ATOMIC_ACQ_REL);
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}
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}
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