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/*
* Copyright (C) 2008 Apple Inc. All Rights Reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY APPLE INC. ``AS IS'' AND ANY
* EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR
* CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
* PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
* OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*
*/
#ifndef WTFThreadData_h
#define WTFThreadData_h
#include <wtf/HashMap.h>
#include <wtf/HashSet.h>
#include <wtf/Noncopyable.h>
#include <wtf/StackBounds.h>
#include <wtf/StackStats.h>
#include <wtf/text/StringHash.h>
#if USE(APPLE_INTERNAL_SDK)
#include <System/pthread_machdep.h>
#endif
#if defined(__PTK_FRAMEWORK_JAVASCRIPTCORE_KEY1)
#define USE_PTHREAD_GETSPECIFIC_DIRECT 1
#endif
#if !USE(PTHREAD_GETSPECIFIC_DIRECT)
#include <wtf/ThreadSpecific.h>
#include <wtf/Threading.h>
#endif
namespace WTF {
class AtomicStringTable;
typedef void (*AtomicStringTableDestructor)(AtomicStringTable*);
class WTFThreadData {
WTF_MAKE_NONCOPYABLE(WTFThreadData);
public:
WTF_EXPORT_PRIVATE WTFThreadData();
WTF_EXPORT_PRIVATE ~WTFThreadData();
AtomicStringTable* atomicStringTable()
{
return m_currentAtomicStringTable;
}
AtomicStringTable* setCurrentAtomicStringTable(AtomicStringTable* atomicStringTable)
{
AtomicStringTable* oldAtomicStringTable = m_currentAtomicStringTable;
m_currentAtomicStringTable = atomicStringTable;
return oldAtomicStringTable;
}
void resetCurrentAtomicStringTable()
{
m_currentAtomicStringTable = m_defaultAtomicStringTable;
}
const StackBounds& stack()
{
// We need to always get a fresh StackBounds from the OS due to how fibers work.
// See https://bugs.webkit.org/show_bug.cgi?id=102411
#if OS(WINDOWS)
m_stackBounds = StackBounds::currentThreadStackBounds();
#endif
return m_stackBounds;
}
#if ENABLE(STACK_STATS)
StackStats::PerThreadStats& stackStats()
{
return m_stackStats;
}
#endif
void* savedStackPointerAtVMEntry()
{
return m_savedStackPointerAtVMEntry;
}
void setSavedStackPointerAtVMEntry(void* stackPointerAtVMEntry)
{
m_savedStackPointerAtVMEntry = stackPointerAtVMEntry;
}
void* savedLastStackTop()
{
return m_savedLastStackTop;
}
void setSavedLastStackTop(void* lastStackTop)
{
m_savedLastStackTop = lastStackTop;
}
void* m_apiData;
private:
AtomicStringTable* m_currentAtomicStringTable;
AtomicStringTable* m_defaultAtomicStringTable;
AtomicStringTableDestructor m_atomicStringTableDestructor;
StackBounds m_stackBounds;
#if ENABLE(STACK_STATS)
StackStats::PerThreadStats m_stackStats;
#endif
void* m_savedStackPointerAtVMEntry;
void* m_savedLastStackTop;
#if USE(PTHREAD_GETSPECIFIC_DIRECT)
static const pthread_key_t directKey = __PTK_FRAMEWORK_JAVASCRIPTCORE_KEY1;
WTF_EXPORT_PRIVATE static WTFThreadData& createAndRegisterForGetspecificDirect();
#else
static WTF_EXPORTDATA ThreadSpecific<WTFThreadData>* staticData;
#endif
friend WTFThreadData& wtfThreadData();
friend class AtomicStringTable;
};
inline WTFThreadData& wtfThreadData()
{
// WRT WebCore:
// WTFThreadData is used on main thread before it could possibly be used
// on secondary ones, so there is no need for synchronization here.
// WRT JavaScriptCore:
// wtfThreadData() is initially called from initializeThreading(), ensuring
// this is initially called in a pthread_once locked context.
#if !USE(PTHREAD_GETSPECIFIC_DIRECT)
if (!WTFThreadData::staticData)
WTFThreadData::staticData = new ThreadSpecific<WTFThreadData>;
return **WTFThreadData::staticData;
#else
if (WTFThreadData* data = static_cast<WTFThreadData*>(_pthread_getspecific_direct(WTFThreadData::directKey)))
return *data;
return WTFThreadData::createAndRegisterForGetspecificDirect();
#endif
}
} // namespace WTF
using WTF::WTFThreadData;
using WTF::wtfThreadData;
using WTF::AtomicStringTable;
#endif // WTFThreadData_h
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