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 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 <memory> 34#include <wtf/Deque.h> 35#include <wtf/HashMap.h> 36#include <wtf/HashSet.h> 37#include <wtf/MessageQueue.h> 38#include <wtf/PassRefPtr.h> 39#include <wtf/RefPtr.h> 40#include <wtf/Threading.h> 41 42namespace WebCore { 43 44class DatabaseBackend; 45class DatabaseTask; 46class DatabaseTaskSynchronizer; 47class Document; 48class SQLTransactionClient; 49class SQLTransactionCoordinator; 50 51class DatabaseThread : public ThreadSafeRefCounted<DatabaseThread> { 52public: 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(std::unique_ptr<DatabaseTask>); 61 void scheduleImmediateTask(std::unique_ptr<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#if PLATFORM(IOS) 72 void setPaused(bool); 73 void handlePausedQueue(); 74#endif 75 76private: 77 DatabaseThread(); 78 79 static void databaseThreadStart(void*); 80 void databaseThread(); 81 82 Mutex m_threadCreationMutex; 83 ThreadIdentifier m_threadID; 84 RefPtr<DatabaseThread> m_selfRef; 85 86 MessageQueue<DatabaseTask> m_queue; 87#if PLATFORM(IOS) 88 MessageQueue<DatabaseTask> m_pausedQueue; 89 Mutex m_pausedMutex; 90 volatile bool m_paused; 91#endif 92 93 // This set keeps track of the open databases that have been used on this thread. 94 typedef HashSet<RefPtr<DatabaseBackend>> DatabaseSet; 95 DatabaseSet m_openDatabaseSet; 96 97 std::unique_ptr<SQLTransactionClient> m_transactionClient; 98 std::unique_ptr<SQLTransactionCoordinator> m_transactionCoordinator; 99 DatabaseTaskSynchronizer* m_cleanupSync; 100}; 101 102} // namespace WebCore 103 104#endif // ENABLE(SQL_DATABASE) 105#endif // DatabaseThread_h 106