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diff --git a/Source/JavaScriptCore/wtf/ThreadIdentifierDataPthreads.cpp b/Source/JavaScriptCore/wtf/ThreadIdentifierDataPthreads.cpp
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+++ b/Source/JavaScriptCore/wtf/ThreadIdentifierDataPthreads.cpp
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+/*
+ * Copyright (C) 2009 Google 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:
+ *
+ *     * Redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer.
+ *     * 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.
+ *     * Neither the name of Google Inc. 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 THE COPYRIGHT HOLDERS AND 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 THE COPYRIGHT
+ * OWNER 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.
+ */
+
+#include "config.h"
+
+#if USE(PTHREADS)
+
+#include "ThreadIdentifierDataPthreads.h"
+
+#include "Threading.h"
+
+namespace WTF {
+
+pthread_key_t ThreadIdentifierData::m_key;
+
+void clearPthreadHandleForIdentifier(ThreadIdentifier);
+
+ThreadIdentifierData::~ThreadIdentifierData()
+{
+    clearPthreadHandleForIdentifier(m_identifier);
+}
+
+ThreadIdentifier ThreadIdentifierData::identifier()
+{
+    initializeKeyOnce();
+    ThreadIdentifierData* threadIdentifierData = static_cast<ThreadIdentifierData*>(pthread_getspecific(m_key));
+
+    return threadIdentifierData ? threadIdentifierData->m_identifier : 0;
+}
+
+void ThreadIdentifierData::initialize(ThreadIdentifier id)
+{
+    ASSERT(!identifier());
+
+    initializeKeyOnce();
+    pthread_setspecific(m_key, new ThreadIdentifierData(id));
+}
+
+void ThreadIdentifierData::destruct(void* data)
+{
+    ThreadIdentifierData* threadIdentifierData = static_cast<ThreadIdentifierData*>(data);
+    ASSERT(threadIdentifierData);
+
+    if (threadIdentifierData->m_isDestroyedOnce) {
+        delete threadIdentifierData;
+        return;
+    }
+
+    threadIdentifierData->m_isDestroyedOnce = true;
+    // Re-setting the value for key causes another destruct() call after all other thread-specific destructors were called.
+    pthread_setspecific(m_key, threadIdentifierData);
+}
+
+void ThreadIdentifierData::initializeKeyOnceHelper()
+{
+    if (pthread_key_create(&m_key, destruct))
+        CRASH();
+}
+
+void ThreadIdentifierData::initializeKeyOnce()
+{
+    static pthread_once_t onceControl = PTHREAD_ONCE_INIT;
+    if (pthread_once(&onceControl, initializeKeyOnceHelper))
+        CRASH();
+}
+
+} // namespace WTF
+
+#endif // USE(PTHREADS)
+