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diff --git a/JavaScriptCore/wtf/ThreadSpecific.h b/JavaScriptCore/wtf/ThreadSpecific.h
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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. 
+ * 3.  Neither the name of Apple Computer, Inc. ("Apple") nor the names of
+ *     its contributors may be used to endorse or promote products derived
+ *     from this software without specific prior written permission. 
+ *
+ * THIS SOFTWARE IS PROVIDED BY APPLE AND ITS CONTRIBUTORS "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 OR ITS 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 WTF_ThreadSpecific_h
+#define WTF_ThreadSpecific_h
+
+#include <wtf/Noncopyable.h>
+
+#if USE(PTHREADS) || PLATFORM(WIN)
+// Windows currently doesn't use pthreads for basic threading, but implementing destructor functions is easier
+// with pthreads, so we use it here.
+#include <pthread.h>
+#endif
+
+namespace WTF {
+
+template<typename T> class ThreadSpecific : Noncopyable {
+public:
+    ThreadSpecific();
+    T* operator->();
+    operator T*();
+    T& operator*();
+    ~ThreadSpecific();
+
+private:
+    T* get();
+    void set(T*);
+    void static destroy(void* ptr);
+
+#if USE(PTHREADS) || PLATFORM(WIN)
+    struct Data : Noncopyable {
+        Data(T* value, ThreadSpecific<T>* owner) : value(value), owner(owner) {}
+
+        T* value;
+        ThreadSpecific<T>* owner;
+    };
+
+    pthread_key_t m_key;
+#endif
+};
+
+#if USE(PTHREADS) || PLATFORM(WIN)
+template<typename T>
+inline ThreadSpecific<T>::ThreadSpecific()
+{
+    int error = pthread_key_create(&m_key, destroy);
+    if (error)
+        CRASH();
+}
+
+template<typename T>
+inline ThreadSpecific<T>::~ThreadSpecific()
+{
+    pthread_key_delete(m_key); // Does not invoke destructor functions.
+}
+
+template<typename T>
+inline T* ThreadSpecific<T>::get()
+{
+    Data* data = static_cast<Data*>(pthread_getspecific(m_key));
+    return data ? data->value : 0;
+}
+
+template<typename T>
+inline void ThreadSpecific<T>::set(T* ptr)
+{
+    ASSERT(!get());
+    pthread_setspecific(m_key, new Data(ptr, this));
+}
+
+template<typename T>
+inline void ThreadSpecific<T>::destroy(void* ptr)
+{
+    Data* data = static_cast<Data*>(ptr);
+    pthread_setspecific(data->owner->m_key, 0);
+    delete data->value;
+    delete data;
+}
+
+#else
+#error ThreadSpecific is not implemented for this platform.
+#endif
+
+template<typename T>
+inline ThreadSpecific<T>::operator T*()
+{
+    T* ptr = static_cast<T*>(get());
+    if (!ptr) {
+        ptr = new T();
+        set(ptr);
+    }
+    return ptr;
+}
+
+template<typename T>
+inline T* ThreadSpecific<T>::operator->()
+{
+    return operator T*();
+}
+
+template<typename T>
+inline T& ThreadSpecific<T>::operator*()
+{
+    return *operator T*();
+}
+
+}
+
+#endif