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diff --git a/Source/JavaScriptCore/jit/JITWorklist.h b/Source/JavaScriptCore/jit/JITWorklist.h
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+++ b/Source/JavaScriptCore/jit/JITWorklist.h
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+/*
+ * Copyright (C) 2016 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.
+ *
+ * THIS SOFTWARE IS PROVIDED BY APPLE INC. ``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 INC. 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. 
+ */
+
+#pragma once
+
+#if ENABLE(JIT)
+
+#include <wtf/AutomaticThread.h>
+#include <wtf/FastMalloc.h>
+#include <wtf/HashSet.h>
+#include <wtf/Lock.h>
+#include <wtf/Noncopyable.h>
+#include <wtf/RefPtr.h>
+#include <wtf/Vector.h>
+
+namespace JSC {
+
+class CodeBlock;
+class VM;
+
+class JITWorklist {
+    WTF_MAKE_NONCOPYABLE(JITWorklist);
+    WTF_MAKE_FAST_ALLOCATED;
+
+    class Plan;
+    typedef Vector<RefPtr<Plan>, 32> Plans;
+    
+public:
+    ~JITWorklist();
+    
+    bool completeAllForVM(VM&); // Return true if any JIT work happened.
+    void poll(VM&);
+    
+    void compileLater(CodeBlock*, unsigned loopOSREntryBytecodeOffset = 0);
+    
+    void compileNow(CodeBlock*, unsigned loopOSREntryBytecodeOffset = 0);
+    
+    static JITWorklist* instance();
+    
+private:
+    JITWorklist();
+    
+    class Thread;
+    friend class Thread;
+    
+    void finalizePlans(Plans&);
+    
+    Plans m_queue;
+    Plans m_plans;
+    HashSet<CodeBlock*> m_planned;
+    
+    Box<Lock> m_lock;
+    RefPtr<AutomaticThreadCondition> m_condition; // We use One True Condition for everything because that's easier.
+    RefPtr<AutomaticThread> m_thread;
+    
+    unsigned m_numAvailableThreads { 0 };
+};
+
+} // namespace JSC
+
+#endif // ENABLE(JIT)