72 lines
2.4 KiB
C++
72 lines
2.4 KiB
C++
// Copyright (C) 2003 Dolphin Project.
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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 General Public License as published by
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// the Free Software Foundation, version 2.0.
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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 General Public License 2.0 for more details.
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// A copy of the GPL 2.0 should have been included with the program.
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// If not, see http://www.gnu.org/licenses/
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// Official SVN repository and contact information can be found at
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// http://code.google.com/p/dolphin-emu/
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#ifndef _ATOMIC_WIN32_H_
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#define _ATOMIC_WIN32_H_
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#include "Common.h"
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#include <Windows.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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//
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// NOTE: Acquire and Release are not differentiated right now. They perform a
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// full memory barrier instead of a "one-way" memory barrier. The newest
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// Windows SDK has Acquire and Release versions of some Interlocked* functions.
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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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InterlockedExchangeAdd((volatile LONG*)&target, (LONG)value);
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}
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inline void AtomicIncrement(volatile u32& target) {
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InterlockedIncrement((volatile LONG*)&target);
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}
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inline u32 AtomicLoad(volatile u32& src) {
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return src; // 32-bit reads are always atomic.
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}
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inline u32 AtomicLoadAcquire(volatile u32& src) {
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MemoryBarrier();
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return src; // 32-bit reads are always atomic.
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}
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inline void AtomicStore(volatile u32& dest, u32 value) {
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dest = value; // 32-bit writes are always atomic.
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}
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inline void AtomicStoreRelease(volatile u32& dest, u32 value) {
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// InterlockedExchange includes a memory barrier as a bonus.
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InterlockedExchange((volatile LONG*)&dest, (LONG)value);
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}
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}
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#endif
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