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+/*
+ * Copyright (C) 2007, 2008 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 DatabaseThread_h
+#define DatabaseThread_h
+
+#if ENABLE(DATABASE)
+#include <wtf/Deque.h>
+#include <wtf/HashMap.h>
+#include <wtf/HashSet.h>
+#include <wtf/MessageQueue.h>
+#include <wtf/OwnPtr.h>
+#include <wtf/PassOwnPtr.h>
+#include <wtf/PassRefPtr.h>
+#include <wtf/RefPtr.h>
+#include <wtf/Threading.h>
+
+namespace WebCore {
+
+class Database;
+class DatabaseTask;
+class DatabaseTaskSynchronizer;
+class Document;
+class SQLTransactionClient;
+class SQLTransactionCoordinator;
+
+class DatabaseThread : public ThreadSafeShared<DatabaseThread> {
+public:
+    static PassRefPtr<DatabaseThread> create() { return adoptRef(new DatabaseThread); }
+    ~DatabaseThread();
+
+    bool start();
+    void requestTermination(DatabaseTaskSynchronizer* cleanupSync);
+    bool terminationRequested(DatabaseTaskSynchronizer* taskSynchronizer = 0) const;
+
+    void scheduleTask(PassOwnPtr<DatabaseTask>);
+    void scheduleImmediateTask(PassOwnPtr<DatabaseTask>); // This just adds the task to the front of the queue - the caller needs to be extremely careful not to create deadlocks when waiting for completion.
+    void unscheduleDatabaseTasks(Database*);
+
+    void recordDatabaseOpen(Database*);
+    void recordDatabaseClosed(Database*);
+    ThreadIdentifier getThreadID() { return m_threadID; }
+
+    SQLTransactionClient* transactionClient() { return m_transactionClient.get(); }
+    SQLTransactionCoordinator* transactionCoordinator() { return m_transactionCoordinator.get(); }
+
+private:
+    DatabaseThread();
+
+    static void* databaseThreadStart(void*);
+    void* databaseThread();
+
+    Mutex m_threadCreationMutex;
+    ThreadIdentifier m_threadID;
+    RefPtr<DatabaseThread> m_selfRef;
+
+    MessageQueue<DatabaseTask> m_queue;
+
+    // This set keeps track of the open databases that have been used on this thread.
+    typedef HashSet<RefPtr<Database> > DatabaseSet;
+    DatabaseSet m_openDatabaseSet;
+
+    OwnPtr<SQLTransactionClient> m_transactionClient;
+    OwnPtr<SQLTransactionCoordinator> m_transactionCoordinator;
+    DatabaseTaskSynchronizer* m_cleanupSync;
+};
+
+} // namespace WebCore
+
+#endif // ENABLE(DATABASE)
+#endif // DatabaseThread_h