Split atomic and mutex implementations and make inlinable.

src/ports/SkThread_win.cpp

-/*
- * Copyright 2008 The Android Open Source Project
- *
- * Use of this source code is governed by a BSD-style license that can be
- * found in the LICENSE file.
- */
-
-#include <windows.h>
-#include <intrin.h>
-#include "SkThread.h"
-
-//MSDN says in order to declare an interlocked function for use as an
-//intrinsic, include intrin.h and put the function in a #pragma intrinsic
-//directive.
-//The pragma appears to be unnecessary, but doesn't hurt.
-#pragma intrinsic(_InterlockedIncrement, _InterlockedExchangeAdd, _InterlockedDecrement)
-#pragma intrinsic(_InterlockedCompareExchange)
-
-int32_t sk_atomic_inc(int32_t* addr) {
-    // InterlockedIncrement returns the new value, we want to return the old.
-    return _InterlockedIncrement(reinterpret_cast<LONG*>(addr)) - 1;
-}
-
-int32_t sk_atomic_add(int32_t* addr, int32_t inc) {
-    return _InterlockedExchangeAdd(reinterpret_cast<LONG*>(addr),
-                                   static_cast<LONG>(inc));
-}
-
-int32_t sk_atomic_dec(int32_t* addr) {
-    return _InterlockedDecrement(reinterpret_cast<LONG*>(addr)) + 1;
-}
-void sk_membar_aquire__after_atomic_dec() { }
-
-int32_t sk_atomic_conditional_inc(int32_t* addr) {
-    while (true) {
-        LONG value = static_cast<int32_t const volatile&>(*addr);
-        if (value == 0) {
-            return 0;
-        }
-        if (_InterlockedCompareExchange(reinterpret_cast<LONG*>(addr),
-                                        value + 1,
-                                        value) == value) {
-            return value;
-        }
-    }
-}
-void sk_membar_aquire__after_atomic_conditional_inc() { }
-
-SkMutex::SkMutex() {
-    SK_COMPILE_ASSERT(sizeof(fStorage) > sizeof(CRITICAL_SECTION),
-                      NotEnoughSizeForCriticalSection);
-    InitializeCriticalSection(reinterpret_cast<CRITICAL_SECTION*>(&fStorage));
-}
-
-SkMutex::~SkMutex() {
-    DeleteCriticalSection(reinterpret_cast<CRITICAL_SECTION*>(&fStorage));
-}
-
-void SkMutex::acquire() {
-    EnterCriticalSection(reinterpret_cast<CRITICAL_SECTION*>(&fStorage));
-}
-
-void SkMutex::release() {
-    LeaveCriticalSection(reinterpret_cast<CRITICAL_SECTION*>(&fStorage));
-}