1
2/*
3 * Copyright 2008 The Android Open Source Project
4 *
5 * Use of this source code is governed by a BSD-style license that can be
6 * found in the LICENSE file.
7 */
8
9
10#include <windows.h>
11#include <intrin.h>
12#include "SkThread.h"
13
14//MSDN says in order to declare an interlocked function for use as an
15//intrinsic, include intrin.h and put the function in a #pragma intrinsic
16//directive.
17//The pragma appears to be unnecessary, but doesn't hurt.
18#pragma intrinsic(_InterlockedIncrement, _InterlockedDecrement)
19
20int32_t sk_atomic_inc(int32_t* addr) {
21    // InterlockedIncrement returns the new value, we want to return the old.
22    return _InterlockedIncrement(reinterpret_cast<LONG*>(addr)) - 1;
23}
24
25int32_t sk_atomic_dec(int32_t* addr) {
26    return _InterlockedDecrement(reinterpret_cast<LONG*>(addr)) + 1;
27}
28
29SkMutex::SkMutex() {
30    SK_COMPILE_ASSERT(sizeof(fStorage) > sizeof(CRITICAL_SECTION),
31                      NotEnoughSizeForCriticalSection);
32    InitializeCriticalSection(reinterpret_cast<CRITICAL_SECTION*>(&fStorage));
33}
34
35SkMutex::~SkMutex() {
36    DeleteCriticalSection(reinterpret_cast<CRITICAL_SECTION*>(&fStorage));
37}
38
39void SkMutex::acquire() {
40    EnterCriticalSection(reinterpret_cast<CRITICAL_SECTION*>(&fStorage));
41}
42
43void SkMutex::release() {
44    LeaveCriticalSection(reinterpret_cast<CRITICAL_SECTION*>(&fStorage));
45}
46
47