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author | Steve Block <steveblock@google.com> | 2011-05-06 11:45:16 +0100 |
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committer | Steve Block <steveblock@google.com> | 2011-05-12 13:44:10 +0100 |
commit | cad810f21b803229eb11403f9209855525a25d57 (patch) | |
tree | 29a6fd0279be608e0fe9ffe9841f722f0f4e4269 /Source/WebCore/storage/DatabaseThread.cpp | |
parent | 121b0cf4517156d0ac5111caf9830c51b69bae8f (diff) | |
download | external_webkit-cad810f21b803229eb11403f9209855525a25d57.zip external_webkit-cad810f21b803229eb11403f9209855525a25d57.tar.gz external_webkit-cad810f21b803229eb11403f9209855525a25d57.tar.bz2 |
Merge WebKit at r75315: Initial merge by git.
Change-Id: I570314b346ce101c935ed22a626b48c2af266b84
Diffstat (limited to 'Source/WebCore/storage/DatabaseThread.cpp')
-rw-r--r-- | Source/WebCore/storage/DatabaseThread.cpp | 185 |
1 files changed, 185 insertions, 0 deletions
diff --git a/Source/WebCore/storage/DatabaseThread.cpp b/Source/WebCore/storage/DatabaseThread.cpp new file mode 100644 index 0000000..3b790ee --- /dev/null +++ b/Source/WebCore/storage/DatabaseThread.cpp @@ -0,0 +1,185 @@ +/* + * Copyright (C) 2007, 2008 Apple Inc. All rights reserved. + * + * Redistribution and use in source and binary forms, with or without + * modification, are permitted provided that the following conditions + * are met: + * + * 1. Redistributions of source code must retain the above copyright + * notice, this list of conditions and the following disclaimer. + * 2. Redistributions in binary form must reproduce the above copyright + * notice, this list of conditions and the following disclaimer in the + * documentation and/or other materials provided with the distribution. + * 3. Neither the name of Apple Computer, Inc. ("Apple") nor the names of + * its contributors may be used to endorse or promote products derived + * from this software without specific prior written permission. + * + * THIS SOFTWARE IS PROVIDED BY APPLE AND ITS CONTRIBUTORS "AS IS" AND ANY + * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED + * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE + * DISCLAIMED. IN NO EVENT SHALL APPLE OR ITS CONTRIBUTORS BE LIABLE FOR ANY + * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES + * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; + * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND + * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT + * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF + * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. + */ + +#include "config.h" +#include "DatabaseThread.h" + +#if ENABLE(DATABASE) + +#include "AutodrainedPool.h" +#include "Database.h" +#include "DatabaseTask.h" +#include "Logging.h" +#include "SQLTransactionClient.h" +#include "SQLTransactionCoordinator.h" +#include <wtf/UnusedParam.h> + +namespace WebCore { + +DatabaseThread::DatabaseThread() + : m_threadID(0) + , m_transactionClient(adoptPtr(new SQLTransactionClient())) + , m_transactionCoordinator(adoptPtr(new SQLTransactionCoordinator())) + , m_cleanupSync(0) +{ + m_selfRef = this; +} + +DatabaseThread::~DatabaseThread() +{ + // FIXME: Any cleanup required here? Since the thread deletes itself after running its detached course, I don't think so. Lets be sure. + ASSERT(terminationRequested()); +} + +bool DatabaseThread::start() +{ + MutexLocker lock(m_threadCreationMutex); + + if (m_threadID) + return true; + + m_threadID = createThread(DatabaseThread::databaseThreadStart, this, "WebCore: Database"); + + return m_threadID; +} + +void DatabaseThread::requestTermination(DatabaseTaskSynchronizer *cleanupSync) +{ + ASSERT(!m_cleanupSync); + m_cleanupSync = cleanupSync; + LOG(StorageAPI, "DatabaseThread %p was asked to terminate\n", this); + m_queue.kill(); +} + +bool DatabaseThread::terminationRequested(DatabaseTaskSynchronizer* taskSynchronizer) const +{ +#ifndef NDEBUG + if (taskSynchronizer) + taskSynchronizer->setHasCheckedForTermination(); +#else + UNUSED_PARAM(taskSynchronizer); +#endif + + return m_queue.killed(); +} + +void* DatabaseThread::databaseThreadStart(void* vDatabaseThread) +{ + DatabaseThread* dbThread = static_cast<DatabaseThread*>(vDatabaseThread); + return dbThread->databaseThread(); +} + +void* DatabaseThread::databaseThread() +{ + { + // Wait for DatabaseThread::start() to complete. + MutexLocker lock(m_threadCreationMutex); + LOG(StorageAPI, "Started DatabaseThread %p", this); + } + + AutodrainedPool pool; + while (OwnPtr<DatabaseTask> task = m_queue.waitForMessage()) { + task->performTask(); + pool.cycle(); + } + + // Clean up the list of all pending transactions on this database thread + m_transactionCoordinator->shutdown(); + + LOG(StorageAPI, "About to detach thread %i and clear the ref to DatabaseThread %p, which currently has %i ref(s)", m_threadID, this, refCount()); + + // 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 + // inconsistent or locked state. + if (m_openDatabaseSet.size() > 0) { + // As the call to close will modify the original set, we must take a copy to iterate over. + DatabaseSet openSetCopy; + openSetCopy.swap(m_openDatabaseSet); + DatabaseSet::iterator end = openSetCopy.end(); + for (DatabaseSet::iterator it = openSetCopy.begin(); it != end; ++it) + (*it)->close(); + } + + // Detach the thread so its resources are no longer of any concern to anyone else + detachThread(m_threadID); + + DatabaseTaskSynchronizer* cleanupSync = m_cleanupSync; + + // Clear the self refptr, possibly resulting in deletion + m_selfRef = 0; + + if (cleanupSync) // Someone wanted to know when we were done cleaning up. + cleanupSync->taskCompleted(); + + return 0; +} + +void DatabaseThread::recordDatabaseOpen(Database* database) +{ + ASSERT(currentThread() == m_threadID); + ASSERT(database); + ASSERT(!m_openDatabaseSet.contains(database)); + m_openDatabaseSet.add(database); +} + +void DatabaseThread::recordDatabaseClosed(Database* database) +{ + ASSERT(currentThread() == m_threadID); + ASSERT(database); + ASSERT(m_queue.killed() || m_openDatabaseSet.contains(database)); + m_openDatabaseSet.remove(database); +} + +void DatabaseThread::scheduleTask(PassOwnPtr<DatabaseTask> task) +{ + ASSERT(!task->hasSynchronizer() || task->hasCheckedForTermination()); + m_queue.append(task); +} + +void DatabaseThread::scheduleImmediateTask(PassOwnPtr<DatabaseTask> task) +{ + ASSERT(!task->hasSynchronizer() || task->hasCheckedForTermination()); + m_queue.prepend(task); +} + +class SameDatabasePredicate { +public: + SameDatabasePredicate(const Database* database) : m_database(database) { } + bool operator()(DatabaseTask* task) const { return task->database() == m_database; } +private: + const Database* m_database; +}; + +void DatabaseThread::unscheduleDatabaseTasks(Database* database) +{ + // Note that the thread loop is running, so some tasks for the database + // may still be executed. This is unavoidable. + SameDatabasePredicate predicate(database); + m_queue.removeIf(predicate); +} +} // namespace WebCore +#endif |