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/*
* 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"
namespace WebCore {
DatabaseThread::DatabaseThread()
: m_threadID(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.
}
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()
{
LOG(StorageAPI, "DatabaseThread %p was asked to terminate\n", this);
m_queue.kill();
}
bool DatabaseThread::terminationRequested() const
{
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 (true) {
RefPtr<DatabaseTask> task;
if (!m_queue.waitForMessage(task))
break;
task->performTask();
pool.cycle();
}
LOG(StorageAPI, "About to detach thread %i and clear the ref to DatabaseThread %p, which currently has %i ref(s)", m_threadID, this, refCount());
// Detach the thread so its resources are no longer of any concern to anyone else
detachThread(m_threadID);
// Clear the self refptr, possibly resulting in deletion
m_selfRef = 0;
return 0;
}
void DatabaseThread::scheduleTask(PassRefPtr<DatabaseTask> task)
{
m_queue.append(task);
}
void DatabaseThread::scheduleImmediateTask(PassRefPtr<DatabaseTask> task)
{
m_queue.prepend(task);
}
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.
Deque<RefPtr<DatabaseTask> > filteredReverseQueue;
RefPtr<DatabaseTask> task;
while (m_queue.tryGetMessage(task)) {
if (task->database() != database)
filteredReverseQueue.append(task);
}
while (!filteredReverseQueue.isEmpty()) {
m_queue.append(filteredReverseQueue.first());
filteredReverseQueue.removeFirst();
}
}
} // namespace WebCore
#endif
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