1/* 2 * Copyright (C) 2007, 2008 Apple Inc. All rights reserved. 3 * 4 * Redistribution and use in source and binary forms, with or without 5 * modification, are permitted provided that the following conditions 6 * are met: 7 * 8 * 1. Redistributions of source code must retain the above copyright 9 * notice, this list of conditions and the following disclaimer. 10 * 2. Redistributions in binary form must reproduce the above copyright 11 * notice, this list of conditions and the following disclaimer in the 12 * documentation and/or other materials provided with the distribution. 13 * 3. Neither the name of Apple Computer, Inc. ("Apple") nor the names of 14 * its contributors may be used to endorse or promote products derived 15 * from this software without specific prior written permission. 16 * 17 * THIS SOFTWARE IS PROVIDED BY APPLE AND ITS CONTRIBUTORS "AS IS" AND ANY 18 * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED 19 * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE 20 * DISCLAIMED. IN NO EVENT SHALL APPLE OR ITS CONTRIBUTORS BE LIABLE FOR ANY 21 * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES 22 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; 23 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND 24 * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 25 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 26 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 27 */ 28#ifndef DatabaseThread_h 29#define DatabaseThread_h 30 31#if ENABLE(SQL_DATABASE) 32 33#include <wtf/Deque.h> 34#include <wtf/HashMap.h> 35#include <wtf/HashSet.h> 36#include <wtf/MessageQueue.h> 37#include <wtf/OwnPtr.h> 38#include <wtf/PassOwnPtr.h> 39#include <wtf/PassRefPtr.h> 40#include <wtf/RefPtr.h> 41#include <wtf/Threading.h> 42 43namespace WebCore { 44 45class DatabaseBackend; 46class DatabaseTask; 47class DatabaseTaskSynchronizer; 48class Document; 49class SQLTransactionClient; 50class SQLTransactionCoordinator; 51 52class DatabaseThread : public ThreadSafeRefCounted<DatabaseThread> { 53public: 54 static PassRefPtr<DatabaseThread> create() { return adoptRef(new DatabaseThread); } 55 ~DatabaseThread(); 56 57 bool start(); 58 void requestTermination(DatabaseTaskSynchronizer* cleanupSync); 59 bool terminationRequested(DatabaseTaskSynchronizer* taskSynchronizer = 0) const; 60 61 void scheduleTask(PassOwnPtr<DatabaseTask>); 62 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. 63 void unscheduleDatabaseTasks(DatabaseBackend*); 64 65 void recordDatabaseOpen(DatabaseBackend*); 66 void recordDatabaseClosed(DatabaseBackend*); 67 ThreadIdentifier getThreadID() { return m_threadID; } 68 69 SQLTransactionClient* transactionClient() { return m_transactionClient.get(); } 70 SQLTransactionCoordinator* transactionCoordinator() { return m_transactionCoordinator.get(); } 71 72private: 73 DatabaseThread(); 74 75 static void databaseThreadStart(void*); 76 void databaseThread(); 77 78 Mutex m_threadCreationMutex; 79 ThreadIdentifier m_threadID; 80 RefPtr<DatabaseThread> m_selfRef; 81 82 MessageQueue<DatabaseTask> m_queue; 83 84 // This set keeps track of the open databases that have been used on this thread. 85 typedef HashSet<RefPtr<DatabaseBackend> > DatabaseSet; 86 DatabaseSet m_openDatabaseSet; 87 88 OwnPtr<SQLTransactionClient> m_transactionClient; 89 OwnPtr<SQLTransactionCoordinator> m_transactionCoordinator; 90 DatabaseTaskSynchronizer* m_cleanupSync; 91}; 92 93} // namespace WebCore 94 95#endif // ENABLE(SQL_DATABASE) 96#endif // DatabaseThread_h 97