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(DATABASE) 32 #include <wtf/Deque.h> 33 #include <wtf/HashMap.h> 34 #include <wtf/HashSet.h> 35 #include <wtf/MessageQueue.h> 36 #include <wtf/PassRefPtr.h> 37 #include <wtf/RefPtr.h> 38 #include <wtf/Threading.h> 39 40 namespace WebCore { 41 42 class Database; 43 class DatabaseTask; 44 class Document; 45 46 class DatabaseThread : public ThreadSafeShared<DatabaseThread> { 47 public: create()48 static PassRefPtr<DatabaseThread> create() { return adoptRef(new DatabaseThread); } 49 ~DatabaseThread(); 50 51 bool start(); 52 void requestTermination(); 53 bool terminationRequested() const; 54 55 void scheduleTask(PassRefPtr<DatabaseTask>); 56 void scheduleImmediateTask(PassRefPtr<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. 57 void unscheduleDatabaseTasks(Database*); 58 59 void recordDatabaseOpen(Database*); 60 void recordDatabaseClosed(Database*); getThreadID()61 ThreadIdentifier getThreadID() { return m_threadID; } 62 63 private: 64 DatabaseThread(); 65 66 static void* databaseThreadStart(void*); 67 void* databaseThread(); 68 69 Mutex m_threadCreationMutex; 70 ThreadIdentifier m_threadID; 71 RefPtr<DatabaseThread> m_selfRef; 72 73 MessageQueue<RefPtr<DatabaseTask> > m_queue; 74 75 // This set keeps track of the open databases that have been used on this thread. 76 typedef HashSet<RefPtr<Database> > DatabaseSet; 77 DatabaseSet m_openDatabaseSet; 78 }; 79 80 } // namespace WebCore 81 82 #endif // ENABLE(DATABASE) 83 #endif // DatabaseThread_h 84