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 #include "wtf/Deque.h" 32 #include "wtf/HashMap.h" 33 #include "wtf/HashSet.h" 34 #include "wtf/MessageQueue.h" 35 #include "wtf/OwnPtr.h" 36 #include "wtf/PassOwnPtr.h" 37 #include "wtf/PassRefPtr.h" 38 #include "wtf/RefPtr.h" 39 #include "wtf/ThreadSafeRefCounted.h" 40 #include "wtf/Threading.h" 41 42 namespace WebCore { 43 44 class DatabaseBackend; 45 class DatabaseTask; 46 class DatabaseTaskSynchronizer; 47 class Document; 48 class SQLTransactionClient; 49 class SQLTransactionCoordinator; 50 51 class DatabaseThread : public ThreadSafeRefCounted<DatabaseThread> { 52 public: 53 static PassRefPtr<DatabaseThread> create() { return adoptRef(new DatabaseThread); } 54 ~DatabaseThread(); 55 56 bool start(); 57 void requestTermination(DatabaseTaskSynchronizer* cleanupSync); 58 bool terminationRequested(DatabaseTaskSynchronizer* taskSynchronizer = 0) const; 59 60 void scheduleTask(PassOwnPtr<DatabaseTask>); 61 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. 62 void unscheduleDatabaseTasks(DatabaseBackend*); 63 64 void recordDatabaseOpen(DatabaseBackend*); 65 void recordDatabaseClosed(DatabaseBackend*); 66 ThreadIdentifier getThreadID() { return m_threadID; } 67 68 SQLTransactionClient* transactionClient() { return m_transactionClient.get(); } 69 SQLTransactionCoordinator* transactionCoordinator() { return m_transactionCoordinator.get(); } 70 71 private: 72 DatabaseThread(); 73 74 static void databaseThreadStart(void*); 75 void databaseThread(); 76 77 Mutex m_threadCreationMutex; 78 ThreadIdentifier m_threadID; 79 RefPtr<DatabaseThread> m_selfRef; 80 81 MessageQueue<DatabaseTask> m_queue; 82 83 // This set keeps track of the open databases that have been used on this thread. 84 typedef HashSet<RefPtr<DatabaseBackend> > DatabaseSet; 85 DatabaseSet m_openDatabaseSet; 86 87 OwnPtr<SQLTransactionClient> m_transactionClient; 88 OwnPtr<SQLTransactionCoordinator> m_transactionCoordinator; 89 DatabaseTaskSynchronizer* m_cleanupSync; 90 }; 91 92 } // namespace WebCore 93 94 #endif // DatabaseThread_h 95
