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/*
* 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"
#include "SkTLS.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<LONG 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));
}
///////////////////////////////////////////////////////////////////////////
static bool gOnce;
static DWORD gTlsIndex;
SK_DECLARE_STATIC_MUTEX(gMutex);
void* SkTLS::PlatformGetSpecific(bool forceCreateTheSlot) {
if (!forceCreateTheSlot && !gOnce) {
return NULL;
}
if (!gOnce) {
SkAutoMutexAcquire tmp(gMutex);
if (!gOnce) {
gTlsIndex = TlsAlloc();
gOnce = true;
}
}
return TlsGetValue(gTlsIndex);
}
void SkTLS::PlatformSetSpecific(void* ptr) {
SkASSERT(gOnce);
(void)TlsSetValue(gTlsIndex, ptr);
}
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