--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/WebKit2/Platform/WorkItem.h	Fri Sep 17 09:02:29 2010 +0300
@@ -0,0 +1,122 @@
+/*
+ * Copyright (C) 2010 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. 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 INC. 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 WorkItem_h
+#define WorkItem_h
+
+#include <wtf/PassOwnPtr.h>
+
+class WorkItem {
+public:
+    template<typename C> 
+    static PassOwnPtr<WorkItem> create(C*, void (C::*)());
+
+    template<typename C, typename T0, typename T1>
+    static PassOwnPtr<WorkItem> create(C*, void (C::*)(T0, T1), T0, T1);
+
+    virtual ~WorkItem() { }
+    virtual void execute() = 0;
+
+protected:
+    WorkItem() { }
+
+private:
+    WorkItem(const WorkItem&);
+    WorkItem& operator=(const WorkItem&);
+};
+
+template <typename C>
+class MemberFunctionWorkItem0 : private WorkItem {
+    // We only allow WorkItem to create this.
+    friend class WorkItem;
+
+    typedef void (C::*FunctionType)();
+    
+    MemberFunctionWorkItem0(C* ptr, FunctionType function)
+        : m_ptr(ptr)
+        , m_function(function)
+    {
+        m_ptr->ref();
+    }
+
+    ~MemberFunctionWorkItem0()
+    {
+        m_ptr->deref();
+    }
+
+    void execute()
+    {
+        (m_ptr->*m_function)();
+    }
+
+    C* m_ptr;
+    FunctionType m_function;
+};
+
+template<typename C, typename T0, typename T1>
+class MemberFunctionWorkItem2 : private WorkItem {
+    // We only allow WorkItem to create this.
+    friend class WorkItem;
+    
+    typedef void (C::*FunctionType)(T0, T1);
+    
+    MemberFunctionWorkItem2(C* ptr, FunctionType function, T0 t0, T1 t1)
+        : m_ptr(ptr)
+        , m_function(function)
+        , m_t0(t0)
+        , m_t1(t1)
+    {
+        m_ptr->ref();
+    }
+    
+    ~MemberFunctionWorkItem2()
+    {
+        m_ptr->deref();
+    }
+
+    void execute()
+    {
+        (m_ptr->*m_function)(m_t0, m_t1);
+    }
+    
+    C* m_ptr;
+    FunctionType m_function;
+    T0 m_t0;
+    T1 m_t1;
+};
+
+template<typename C>
+PassOwnPtr<WorkItem> WorkItem::create(C* ptr, void (C::*function)())
+{
+    return adoptPtr(static_cast<WorkItem*>(new MemberFunctionWorkItem0<C>(ptr, function)));
+}
+
+template<typename C, typename T0, typename T1>
+PassOwnPtr<WorkItem> WorkItem::create(C* ptr, void (C::*function)(T0, T1), T0 t0, T1 t1)
+{
+    return adoptPtr(static_cast<WorkItem*>(new MemberFunctionWorkItem2<C, T0, T1>(ptr, function, t0, t1)));
+}
+
+#endif // WorkItem_h