2 * Copyright (C) 2007, 2008, 2013 Apple Inc. All rights reserved.
4 * Redistribution and use in source and binary forms, with or without
5 * modification, are permitted provided that the following conditions
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.
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.
30 #include "modules/webdatabase/DatabaseThread.h"
32 #include "modules/webdatabase/Database.h"
33 #include "modules/webdatabase/DatabaseTask.h"
34 #include "modules/webdatabase/SQLTransactionClient.h"
35 #include "modules/webdatabase/SQLTransactionCoordinator.h"
36 #include "platform/Logging.h"
37 #include "platform/heap/glue/MessageLoopInterruptor.h"
38 #include "platform/heap/glue/PendingGCRunner.h"
39 #include "public/platform/Platform.h"
43 DatabaseThread::DatabaseThread()
44 : m_transactionClient(adoptPtr(new SQLTransactionClient()))
45 , m_transactionCoordinator(adoptPtrWillBeNoop(new SQLTransactionCoordinator()))
47 , m_terminationRequested(false)
51 DatabaseThread::~DatabaseThread()
53 ASSERT(m_openDatabaseSet.isEmpty());
54 // Oilpan: The database thread must have finished its cleanup tasks before
55 // the following clear(). Otherwise, WebThread destructor blocks the caller
56 // thread, and causes a deadlock with ThreadState cleanup.
57 // DatabaseContext::stop() asks the database thread to close all of
58 // databases, and wait until GC heap cleanup of the database thread. So we
59 // can safely destruct WebThread here.
63 void DatabaseThread::trace(Visitor* visitor)
66 visitor->trace(m_openDatabaseSet);
67 visitor->trace(m_transactionCoordinator);
71 void DatabaseThread::start()
75 m_thread = adoptPtr(Platform::current()->createThread("WebCore: Database"));
76 m_thread->postTask(new Task(WTF::bind(&DatabaseThread::setupDatabaseThread, this)));
79 void DatabaseThread::setupDatabaseThread()
81 m_pendingGCRunner = adoptPtr(new PendingGCRunner);
82 m_messageLoopInterruptor = adoptPtr(new MessageLoopInterruptor(m_thread.get()));
83 m_thread->addTaskObserver(m_pendingGCRunner.get());
84 ThreadState::attach();
85 ThreadState::current()->addInterruptor(m_messageLoopInterruptor.get());
88 void DatabaseThread::requestTermination(TaskSynchronizer *cleanupSync)
90 MutexLocker lock(m_terminationRequestedMutex);
91 ASSERT(!m_terminationRequested);
92 m_terminationRequested = true;
93 m_cleanupSync = cleanupSync;
94 WTF_LOG(StorageAPI, "DatabaseThread %p was asked to terminate\n", this);
95 m_thread->postTask(new Task(WTF::bind(&DatabaseThread::cleanupDatabaseThread, this)));
98 bool DatabaseThread::terminationRequested(TaskSynchronizer* taskSynchronizer) const
101 if (taskSynchronizer)
102 taskSynchronizer->setHasCheckedForTermination();
105 MutexLocker lock(m_terminationRequestedMutex);
106 return m_terminationRequested;
109 void DatabaseThread::cleanupDatabaseThread()
111 WTF_LOG(StorageAPI, "Cleaning up DatabaseThread %p", this);
113 // Clean up the list of all pending transactions on this database thread
114 m_transactionCoordinator->shutdown();
116 // Close the databases that we ran transactions on. This ensures that if any transactions are still open, they are rolled back and we don't leave the database in an
117 // inconsistent or locked state.
118 if (m_openDatabaseSet.size() > 0) {
119 // As the call to close will modify the original set, we must take a copy to iterate over.
120 WillBeHeapHashSet<RefPtrWillBeMember<DatabaseBackend> > openSetCopy;
121 openSetCopy.swap(m_openDatabaseSet);
122 WillBeHeapHashSet<RefPtrWillBeMember<DatabaseBackend> >::iterator end = openSetCopy.end();
123 for (WillBeHeapHashSet<RefPtrWillBeMember<DatabaseBackend> >::iterator it = openSetCopy.begin(); it != end; ++it)
127 m_thread->postTask(new Task(WTF::bind(&DatabaseThread::cleanupDatabaseThreadCompleted, this)));
130 void DatabaseThread::cleanupDatabaseThreadCompleted()
132 ThreadState::current()->removeInterruptor(m_messageLoopInterruptor.get());
133 ThreadState::detach();
134 // We need to unregister PendingGCRunner before finising this task to avoid
135 // PendingGCRunner::didProcessTask accesses dead ThreadState.
136 m_thread->removeTaskObserver(m_pendingGCRunner.get());
138 if (m_cleanupSync) // Someone wanted to know when we were done cleaning up.
139 m_cleanupSync->taskCompleted();
142 void DatabaseThread::recordDatabaseOpen(DatabaseBackend* database)
144 ASSERT(isDatabaseThread());
146 ASSERT(!m_openDatabaseSet.contains(database));
147 m_openDatabaseSet.add(database);
150 void DatabaseThread::recordDatabaseClosed(DatabaseBackend* database)
152 ASSERT(isDatabaseThread());
154 ASSERT(m_terminationRequested || m_openDatabaseSet.contains(database));
155 m_openDatabaseSet.remove(database);
158 bool DatabaseThread::isDatabaseOpen(DatabaseBackend* database)
160 ASSERT(isDatabaseThread());
162 MutexLocker lock(m_terminationRequestedMutex);
163 return !m_terminationRequested && m_openDatabaseSet.contains(database);
166 void DatabaseThread::scheduleTask(PassOwnPtr<DatabaseTask> task)
169 ASSERT(!task->hasSynchronizer() || task->hasCheckedForTermination());
170 // WebThread takes ownership of the task.
171 m_thread->postTask(task.leakPtr());