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diff --git a/Source/JavaScriptCore/wtf/ThreadingPrimitives.h b/Source/JavaScriptCore/wtf/ThreadingPrimitives.h
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+/*
+ * Copyright (C) 2007, 2008, 2010 Apple Inc. All rights reserved.
+ * Copyright (C) 2007 Justin Haygood (jhaygood@reaktix.com)
+ *
+ * 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 ThreadingPrimitives_h
+#define ThreadingPrimitives_h
+
+#include "Platform.h"
+
+#include <wtf/Assertions.h>
+#include <wtf/Locker.h>
+#include <wtf/Noncopyable.h>
+
+#if OS(WINDOWS)
+#include <windows.h>
+#endif
+
+#if USE(PTHREADS)
+#include <pthread.h>
+#elif PLATFORM(GTK)
+#include "GOwnPtr.h"
+#endif
+
+#if PLATFORM(QT)
+#include <qglobal.h>
+QT_BEGIN_NAMESPACE
+class QMutex;
+class QWaitCondition;
+QT_END_NAMESPACE
+#endif
+
+namespace WTF {
+
+#if USE(PTHREADS)
+typedef pthread_mutex_t PlatformMutex;
+#if HAVE(PTHREAD_RWLOCK)
+typedef pthread_rwlock_t PlatformReadWriteLock;
+#else
+typedef void* PlatformReadWriteLock;
+#endif
+typedef pthread_cond_t PlatformCondition;
+#elif PLATFORM(GTK)
+typedef GOwnPtr<GMutex> PlatformMutex;
+typedef void* PlatformReadWriteLock; // FIXME: Implement.
+typedef GOwnPtr<GCond> PlatformCondition;
+#elif PLATFORM(QT)
+typedef QT_PREPEND_NAMESPACE(QMutex)* PlatformMutex;
+typedef void* PlatformReadWriteLock; // FIXME: Implement.
+typedef QT_PREPEND_NAMESPACE(QWaitCondition)* PlatformCondition;
+#elif OS(WINDOWS)
+struct PlatformMutex {
+    CRITICAL_SECTION m_internalMutex;
+    size_t m_recursionCount;
+};
+typedef void* PlatformReadWriteLock; // FIXME: Implement.
+struct PlatformCondition {
+    size_t m_waitersGone;
+    size_t m_waitersBlocked;
+    size_t m_waitersToUnblock; 
+    HANDLE m_blockLock;
+    HANDLE m_blockQueue;
+    HANDLE m_unblockLock;
+
+    bool timedWait(PlatformMutex&, DWORD durationMilliseconds);
+    void signal(bool unblockAll);
+};
+#else
+typedef void* PlatformMutex;
+typedef void* PlatformReadWriteLock;
+typedef void* PlatformCondition;
+#endif
+    
+class Mutex : public Noncopyable {
+public:
+    Mutex();
+    ~Mutex();
+
+    void lock();
+    bool tryLock();
+    void unlock();
+
+public:
+    PlatformMutex& impl() { return m_mutex; }
+private:
+    PlatformMutex m_mutex;
+};
+
+typedef Locker<Mutex> MutexLocker;
+
+class ReadWriteLock : public Noncopyable {
+public:
+    ReadWriteLock();
+    ~ReadWriteLock();
+
+    void readLock();
+    bool tryReadLock();
+
+    void writeLock();
+    bool tryWriteLock();
+    
+    void unlock();
+
+private:
+    PlatformReadWriteLock m_readWriteLock;
+};
+
+class ThreadCondition : public Noncopyable {
+public:
+    ThreadCondition();
+    ~ThreadCondition();
+    
+    void wait(Mutex& mutex);
+    // Returns true if the condition was signaled before absoluteTime, false if the absoluteTime was reached or is in the past.
+    // The absoluteTime is in seconds, starting on January 1, 1970. The time is assumed to use the same time zone as WTF::currentTime().
+    bool timedWait(Mutex&, double absoluteTime);
+    void signal();
+    void broadcast();
+    
+private:
+    PlatformCondition m_condition;
+};
+
+} // namespace WTF
+
+using WTF::Mutex;
+using WTF::MutexLocker;
+using WTF::ThreadCondition;
+
+#endif // ThreadingPrimitives_h