diff -r 000000000000 -r 4f2f89ce4247 WebCore/bindings/js/JSCallbackData.h
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/WebCore/bindings/js/JSCallbackData.h	Fri Sep 17 09:02:29 2010 +0300
@@ -0,0 +1,97 @@
+/*
+ * Copyright (C) 2007, 2008, 2009 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.
+ */
+
+#ifndef JSCallbackData_h
+#define JSCallbackData_h
+
+#include "JSDOMBinding.h"
+#include "JSDOMGlobalObject.h"
+#include "ScriptExecutionContext.h"
+#include <runtime/JSObject.h>
+#include <runtime/Protect.h>
+#include <wtf/Threading.h>
+
+namespace WebCore {
+
+// We have to clean up this data on the context thread because unprotecting a
+// JSObject on the wrong thread without synchronization would corrupt the heap
+// (and synchronization would be slow).
+
+class JSCallbackData {
+public:
+    static void deleteData(void*);
+
+    JSCallbackData(JSC::JSObject* callback, JSDOMGlobalObject* globalObject)
+        : m_callback(callback)
+        , m_globalObject(globalObject)
+#ifndef NDEBUG
+        , m_thread(currentThread())
+#endif
+    {
+    }
+    
+    ~JSCallbackData()
+    {
+        ASSERT(m_thread == currentThread());
+    }
+
+    JSC::JSObject* callback() { return m_callback.get(); }
+    JSDOMGlobalObject* globalObject() { return m_globalObject.get(); }
+    
+    JSC::JSValue invokeCallback(JSC::MarkedArgumentBuffer&, bool* raisedException = 0);
+
+private:
+    JSC::ProtectedPtr<JSC::JSObject> m_callback;
+    JSC::ProtectedPtr<JSDOMGlobalObject> m_globalObject;
+#ifndef NDEBUG
+    ThreadIdentifier m_thread;
+#endif
+};
+
+class DeleteCallbackDataTask : public ScriptExecutionContext::Task {
+public:
+    static PassOwnPtr<DeleteCallbackDataTask> create(JSCallbackData* data)
+    {
+        return new DeleteCallbackDataTask(data);
+    }
+
+    virtual void performTask(ScriptExecutionContext*)
+    {
+        delete m_data;
+    }
+    virtual bool isCleanupTask() const { return true; }
+private:
+
+    DeleteCallbackDataTask(JSCallbackData* data) : m_data(data) {}
+
+    JSCallbackData* m_data;
+};
+
+} // namespace WebCore
+
+#endif // JSCallbackData_h