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/*
* Copyright (C) 2009 Jian Li <jianli@chromium.org>
* Copyright (C) 2012 Patrick Gansterer <paroga@paroga.com>
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Library General Public
* License as published by the Free Software Foundation; either
* version 2 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Library General Public License for more details.
*
* You should have received a copy of the GNU Library General Public License
* along with this library; see the file COPYING.LIB. If not, write to
* the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
* Boston, MA 02110-1301, USA.
*
*/
#include "config.h"
#include "ThreadSpecific.h"
#include "StdLibExtras.h"
#include "ThreadingPrimitives.h"
#if !USE(PTHREADS)
namespace WTF {
static Mutex& destructorsMutex()
{
DEFINE_STATIC_LOCAL(Mutex, staticMutex, ());
return staticMutex;
}
class ThreadSpecificKeyValue {
public:
ThreadSpecificKeyValue(void (*destructor)(void *))
: m_destructor(destructor)
{
m_tlsKey = TlsAlloc();
if (m_tlsKey == TLS_OUT_OF_INDEXES)
CRASH();
MutexLocker locker(destructorsMutex());
m_next = m_first;
m_first = this;
}
~ThreadSpecificKeyValue()
{
MutexLocker locker(destructorsMutex());
ThreadSpecificKeyValue** next = &m_first;
while (*next != this) {
ASSERT(*next);
next = &(*next)->m_next;
}
*next = (*next)->m_next;
TlsFree(m_tlsKey);
}
void setValue(void* data) { TlsSetValue(m_tlsKey, data); }
void* value() { return TlsGetValue(m_tlsKey); }
static void callDestructors()
{
MutexLocker locker(destructorsMutex());
ThreadSpecificKeyValue* next = m_first;
while (next) {
if (void* data = next->value())
next->m_destructor(data);
next = next->m_next;
}
}
private:
void (*m_destructor)(void *);
DWORD m_tlsKey;
ThreadSpecificKeyValue* m_next;
static ThreadSpecificKeyValue* m_first;
};
ThreadSpecificKeyValue* ThreadSpecificKeyValue::m_first = 0;
long& tlsKeyCount()
{
static long count;
return count;
}
DWORD* tlsKeys()
{
static DWORD keys[kMaxTlsKeySize];
return keys;
}
void ThreadSpecificKeyCreate(ThreadSpecificKey* key, void (*destructor)(void *))
{
*key = new ThreadSpecificKeyValue(destructor);
}
void ThreadSpecificKeyDelete(ThreadSpecificKey key)
{
delete key;
}
void ThreadSpecificSet(ThreadSpecificKey key, void* data)
{
key->setValue(data);
}
void* ThreadSpecificGet(ThreadSpecificKey key)
{
return key->value();
}
void ThreadSpecificThreadExit()
{
for (long i = 0; i < tlsKeyCount(); i++) {
// The layout of ThreadSpecific<T>::Data does not depend on T. So we are safe to do the static cast to ThreadSpecific<int> in order to access its data member.
ThreadSpecific<int>::Data* data = static_cast<ThreadSpecific<int>::Data*>(TlsGetValue(tlsKeys()[i]));
if (data)
data->destructor(data);
}
ThreadSpecificKeyValue::callDestructors();
}
} // namespace WTF
#endif // !USE(PTHREADS)
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