From 7564d28faf780bc0967ab3f6ff11b29b44e4b1aa Mon Sep 17 00:00:00 2001
From: ShizZy <shizzy@6bit.net>
Date: Wed, 4 Sep 2013 20:17:46 -0400
Subject: replaced common code with dolphin common

---
 src/common/src/atomic_win32.h | 72 +++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 72 insertions(+)
 create mode 100644 src/common/src/atomic_win32.h

(limited to 'src/common/src/atomic_win32.h')

diff --git a/src/common/src/atomic_win32.h b/src/common/src/atomic_win32.h
new file mode 100644
index 000000000..31ee0b784
--- /dev/null
+++ b/src/common/src/atomic_win32.h
@@ -0,0 +1,72 @@
+// Copyright 2013 Dolphin Emulator Project
+// Licensed under GPLv2
+// Refer to the license.txt file included.
+
+#ifndef _ATOMIC_WIN32_H_
+#define _ATOMIC_WIN32_H_
+
+#include "common.h"
+#include <intrin.h>
+#include <Windows.h>
+
+// Atomic operations are performed in a single step by the CPU. It is
+// impossible for other threads to see the operation "half-done."
+//
+// Some atomic operations can be combined with different types of memory
+// barriers called "Acquire semantics" and "Release semantics", defined below.
+//
+// Acquire semantics: Future memory accesses cannot be relocated to before the
+//                    operation.
+//
+// Release semantics: Past memory accesses cannot be relocated to after the
+//                    operation.
+//
+// These barriers affect not only the compiler, but also the CPU.
+//
+// NOTE: Acquire and Release are not differentiated right now. They perform a
+// full memory barrier instead of a "one-way" memory barrier. The newest
+// Windows SDK has Acquire and Release versions of some Interlocked* functions.
+
+namespace Common
+{
+
+inline void AtomicAdd(volatile u32& target, u32 value) {
+	InterlockedExchangeAdd((volatile LONG*)&target, (LONG)value);
+}
+
+inline void AtomicAnd(volatile u32& target, u32 value) {
+	_InterlockedAnd((volatile LONG*)&target, (LONG)value);
+}
+
+inline void AtomicIncrement(volatile u32& target) {
+	InterlockedIncrement((volatile LONG*)&target);
+}
+
+inline void AtomicDecrement(volatile u32& target) {
+	InterlockedDecrement((volatile LONG*)&target);
+}
+
+inline u32 AtomicLoad(volatile u32& src) {
+	return src; // 32-bit reads are always atomic.
+}
+inline u32 AtomicLoadAcquire(volatile u32& src) {
+	u32 result = src; // 32-bit reads are always atomic.
+	_ReadBarrier(); // Compiler instruction only. x86 loads always have acquire semantics.
+	return result;
+}
+
+inline void AtomicOr(volatile u32& target, u32 value) {
+	_InterlockedOr((volatile LONG*)&target, (LONG)value);
+}
+
+inline void AtomicStore(volatile u32& dest, u32 value) {
+	dest = value; // 32-bit writes are always atomic.
+}
+inline void AtomicStoreRelease(volatile u32& dest, u32 value) {
+	_WriteBarrier(); // Compiler instruction only. x86 stores always have release semantics.
+	dest = value; // 32-bit writes are always atomic.
+}
+
+}
+
+#endif
-- 
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