1 files changed, 98 insertions, 0 deletions
diff --git a/Source/WebCore/Modules/indexeddb/IDBActiveDOMObject.h b/Source/WebCore/Modules/indexeddb/IDBActiveDOMObject.h
new file mode 100644
index 000000000..141b9383a
--- /dev/null
+++ b/Source/WebCore/Modules/indexeddb/IDBActiveDOMObject.h
@@ -0,0 +1,98 @@
+/*
+ * 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. 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.
+ */
+
+#pragma once
+
+#include "ActiveDOMObject.h"
+#include "ScriptExecutionContext.h"
+#include <wtf/CrossThreadTask.h>
+#include <wtf/MainThread.h>
+#include <wtf/Threading.h>
+
+#if ENABLE(INDEXED_DATABASE)
+
+namespace WebCore {
+
+class IDBActiveDOMObject : public ActiveDOMObject {
+public:
+    ThreadIdentifier originThreadID() const { return m_originThreadID; }
+
+    void contextDestroyed() final {
+        ASSERT(currentThread() == m_originThreadID);
+
+        Locker<Lock> lock(m_scriptExecutionContextLock);
+        ActiveDOMObject::contextDestroyed();
+    }
+
+    template<typename T, typename... Parameters, typename... Arguments>
+    void performCallbackOnOriginThread(T& object, void (T::*method)(Parameters...), Arguments&&... arguments)
+    {
+        ASSERT(originThreadID() == object.originThreadID());
+
+        if (object.originThreadID() == currentThread()) {
+            (object.*method)(arguments...);
+            return;
+        }
+
+        Locker<Lock> lock(m_scriptExecutionContextLock);
+
+        ScriptExecutionContext* context = scriptExecutionContext();
+        if (!context)
+            return;
+
+        context->postCrossThreadTask(object, method, arguments...);
+    }
+
+    void callFunctionOnOriginThread(WTF::Function<void ()>&& function)
+    {
+        if (originThreadID() == currentThread()) {
+            function();
+            return;
+        }
+
+        Locker<Lock> lock(m_scriptExecutionContextLock);
+
+        ScriptExecutionContext* context = scriptExecutionContext();
+        if (!context)
+            return;
+
+        context->postTask(WTFMove(function));
+    }
+
+protected:
+    IDBActiveDOMObject(ScriptExecutionContext* context)
+        : ActiveDOMObject(context)
+    {
+        ASSERT(context);
+    }
+
+private:
+    ThreadIdentifier m_originThreadID { currentThread() };
+    Lock m_scriptExecutionContextLock;
+};
+
+} // namespace WebCore
+
+#endif // ENABLE(INDEXED_DATABASE)