184 lines
6.1 KiB
C++
184 lines
6.1 KiB
C++
/*
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* Copyright (C) 2007, 2008, 2013 Apple Inc. All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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*
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. Neither the name of Apple Inc. ("Apple") nor the names of
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* its contributors may be used to endorse or promote products derived
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* from this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY APPLE AND ITS CONTRIBUTORS "AS IS" AND ANY
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* EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
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* WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
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* DISCLAIMED. IN NO EVENT SHALL APPLE OR ITS CONTRIBUTORS BE LIABLE FOR ANY
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* DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
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* (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
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* LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
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* ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#include "config.h"
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#include "DatabaseThread.h"
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#include "Database.h"
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#include "DatabaseTask.h"
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#include "Logging.h"
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#include "SQLTransaction.h"
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#include "SQLTransactionCoordinator.h"
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#include <wtf/AutodrainedPool.h>
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namespace WebCore {
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DatabaseThread::DatabaseThread()
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: m_transactionCoordinator(makeUnique<SQLTransactionCoordinator>())
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{
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m_selfRef = this;
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}
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DatabaseThread::~DatabaseThread()
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{
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// The DatabaseThread will only be destructed when both its owner
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// DatabaseContext has deref'ed it, and the databaseThread() thread function
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// has deref'ed the DatabaseThread object. The DatabaseContext destructor
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// will take care of ensuring that a termination request has been issued.
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// The termination request will trigger an orderly shutdown of the thread
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// function databaseThread(). In shutdown, databaseThread() will deref the
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// DatabaseThread before returning.
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ASSERT(terminationRequested());
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}
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void DatabaseThread::start()
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{
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Locker locker { m_threadCreationMutex };
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if (m_thread)
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return;
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m_thread = Thread::create("WebCore: Database", [this] {
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databaseThread();
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});
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}
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void DatabaseThread::requestTermination(DatabaseTaskSynchronizer* cleanupSync)
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{
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m_cleanupSync = cleanupSync;
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LOG(StorageAPI, "DatabaseThread %p was asked to terminate\n", this);
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m_queue.kill();
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}
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bool DatabaseThread::terminationRequested(DatabaseTaskSynchronizer* taskSynchronizer) const
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{
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#if ASSERT_ENABLED
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if (taskSynchronizer)
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taskSynchronizer->setHasCheckedForTermination();
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#else
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UNUSED_PARAM(taskSynchronizer);
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#endif
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return m_queue.killed();
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}
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void DatabaseThread::databaseThread()
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{
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{
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// Wait for DatabaseThread::start() to complete.
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Locker locker { m_threadCreationMutex };
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LOG(StorageAPI, "Started DatabaseThread %p", this);
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}
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while (auto task = m_queue.waitForMessage()) {
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AutodrainedPool pool;
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task->performTask();
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}
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// Clean up the list of all pending transactions on this database thread
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m_transactionCoordinator->shutdown();
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LOG(StorageAPI, "About to detach thread %p and clear the ref to DatabaseThread %p, which currently has %i ref(s)", m_thread.get(), this, refCount());
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// 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
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// inconsistent or locked state.
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DatabaseSet openSetCopy;
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{
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Locker locker { m_openDatabaseSetLock };
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if (m_openDatabaseSet.size() > 0) {
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// As the call to close will modify the original set, we must take a copy to iterate over.
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openSetCopy.swap(m_openDatabaseSet);
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}
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}
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for (auto& openDatabase : openSetCopy)
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openDatabase->performClose();
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// Detach the thread so its resources are no longer of any concern to anyone else
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m_thread->detach();
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DatabaseTaskSynchronizer* cleanupSync = m_cleanupSync;
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// Clear the self refptr, possibly resulting in deletion
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m_selfRef = nullptr;
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if (cleanupSync) // Someone wanted to know when we were done cleaning up.
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cleanupSync->taskCompleted();
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}
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void DatabaseThread::recordDatabaseOpen(Database& database)
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{
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Locker locker { m_openDatabaseSetLock };
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ASSERT(m_thread == &Thread::current());
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ASSERT(!m_openDatabaseSet.contains(&database));
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m_openDatabaseSet.add(&database);
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}
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void DatabaseThread::recordDatabaseClosed(Database& database)
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{
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Locker locker { m_openDatabaseSetLock };
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ASSERT(m_thread == &Thread::current());
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ASSERT(m_queue.killed() || m_openDatabaseSet.contains(&database));
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m_openDatabaseSet.remove(&database);
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}
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void DatabaseThread::scheduleTask(std::unique_ptr<DatabaseTask>&& task)
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{
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ASSERT(!task->hasSynchronizer() || task->hasCheckedForTermination());
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m_queue.append(WTFMove(task));
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}
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void DatabaseThread::scheduleImmediateTask(std::unique_ptr<DatabaseTask>&& task)
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{
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ASSERT(!task->hasSynchronizer() || task->hasCheckedForTermination());
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m_queue.prepend(WTFMove(task));
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}
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void DatabaseThread::unscheduleDatabaseTasks(Database& database)
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{
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// The thread loop is running, sp some tasks for this database may still be executed. This is unavoidable.
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m_queue.removeIf([&database] (const DatabaseTask& task) {
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return &task.database() == &database;
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});
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}
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bool DatabaseThread::hasPendingDatabaseActivity() const
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{
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Locker locker { m_openDatabaseSetLock };
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for (auto& database : m_openDatabaseSet) {
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if (database->hasPendingCreationEvent() || database->hasPendingTransaction())
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return true;
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}
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return false;
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}
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} // namespace WebCore
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