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diff --git a/Source/JavaScriptCore/runtime/InitializeThreading.cpp b/Source/JavaScriptCore/runtime/InitializeThreading.cpp
new file mode 100644
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+++ b/Source/JavaScriptCore/runtime/InitializeThreading.cpp
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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.
+ */
+
+#include "config.h"
+#include "InitializeThreading.h"
+
+#include "ExecutableAllocator.h"
+#include "Heap.h"
+#include "Options.h"
+#include "Identifier.h"
+#include "JSDateMath.h"
+#include "JSGlobalObject.h"
+#include "UString.h"
+#include "WriteBarrier.h"
+#include "dtoa.h"
+#include <wtf/Threading.h>
+#include <wtf/dtoa/cached-powers.h>
+
+using namespace WTF;
+
+namespace JSC {
+
+#if OS(DARWIN)
+static pthread_once_t initializeThreadingKeyOnce = PTHREAD_ONCE_INIT;
+#endif
+
+static void initializeThreadingOnce()
+{
+    WTF::double_conversion::initialize();
+    WTF::initializeThreading();
+    Options::initializeOptions();
+#if ENABLE(WRITE_BARRIER_PROFILING)
+    WriteBarrierCounters::initialize();
+#endif
+#if ENABLE(JIT) && ENABLE(ASSEMBLER)
+    ExecutableAllocator::initializeAllocator();
+#endif
+    RegisterFile::initializeThreading();
+}
+
+void initializeThreading()
+{
+#if OS(DARWIN)
+    pthread_once(&initializeThreadingKeyOnce, initializeThreadingOnce);
+#else
+    static bool initializedThreading = false;
+    if (!initializedThreading) {
+        initializeThreadingOnce();
+        initializedThreading = true;
+    }
+#endif
+}
+
+} // namespace JSC