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/*
* Copyright 2013 Google Inc.
*
* Use of this source code is governed by a BSD-style license that can be
* found in the LICENSE file.
*/
#include "SkTypes.h"
#if defined(SK_BUILD_FOR_WIN32)
#include "SkLeanWindows.h"
#include "SkMutex.h"
#include "SkTLS.h"
static bool gOnce = false;
static DWORD gTlsIndex;
SK_DECLARE_STATIC_MUTEX(gMutex);
void* SkTLS::PlatformGetSpecific(bool forceCreateTheSlot) {
if (!forceCreateTheSlot && !gOnce) {
return nullptr;
}
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);
}
// Call TLS destructors on thread exit. Code based on Chromium's
// base/threading/thread_local_storage_win.cc
#ifdef _WIN64
#pragma comment(linker, "/INCLUDE:_tls_used")
#pragma comment(linker, "/INCLUDE:skia_tls_callback")
#else
#pragma comment(linker, "/INCLUDE:__tls_used")
#pragma comment(linker, "/INCLUDE:_skia_tls_callback")
#endif
void NTAPI onTLSCallback(PVOID unused, DWORD reason, PVOID unused2) {
if ((DLL_THREAD_DETACH == reason || DLL_PROCESS_DETACH == reason) && gOnce) {
void* ptr = TlsGetValue(gTlsIndex);
if (ptr != nullptr) {
SkTLS::Destructor(ptr);
TlsSetValue(gTlsIndex, nullptr);
}
}
}
extern "C" {
#ifdef _WIN64
#pragma const_seg(".CRT$XLB")
extern const PIMAGE_TLS_CALLBACK skia_tls_callback;
const PIMAGE_TLS_CALLBACK skia_tls_callback = onTLSCallback;
#pragma const_seg()
#else
#pragma data_seg(".CRT$XLB")
PIMAGE_TLS_CALLBACK skia_tls_callback = onTLSCallback;
#pragma data_seg()
#endif
}
#endif//defined(SK_BUILD_FOR_WIN32)
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