DatabaseThread.cpp [plain text]
#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"
namespace WebCore {
DatabaseThread::DatabaseThread()
: m_threadID(0)
, m_paused(false)
, m_transactionClient(new SQLTransactionClient())
, m_transactionCoordinator(new SQLTransactionCoordinator())
, m_cleanupSync(0)
{
m_selfRef = this;
}
DatabaseThread::~DatabaseThread()
{
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_pausedQueue.kill();
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();
}
class DatabaseUnpauseTask : public DatabaseTask {
public:
static PassOwnPtr<DatabaseUnpauseTask> create(DatabaseThread* thread)
{
return new DatabaseUnpauseTask(thread);
}
virtual bool shouldPerformWhilePaused() const
{
return true;
}
private:
DatabaseUnpauseTask(DatabaseThread* thread)
: DatabaseTask(0, 0)
, m_thread(thread)
{}
virtual void doPerformTask()
{
m_thread->handlePausedQueue();
}
#ifndef NDEBUG
virtual const char* debugTaskName() const { return "DatabaseUnpauseTask"; }
#endif
DatabaseThread* m_thread;
};
void DatabaseThread::setPaused(bool paused)
{
if (m_paused == paused)
return;
MutexLocker pausedLocker(m_pausedMutex);
m_paused = paused;
if (!m_paused)
scheduleTask(DatabaseUnpauseTask::create(this));
}
void DatabaseThread::handlePausedQueue()
{
Vector<OwnPtr<DatabaseTask> > pausedTasks;
while (OwnPtr<DatabaseTask> task = m_pausedQueue.tryGetMessage())
pausedTasks.append(task.release());
AutodrainedPool pool;
for (unsigned i = 0; i < pausedTasks.size(); ++i) {
OwnPtr<DatabaseTask> task(pausedTasks[i].release());
{
MutexLocker pausedLocker(m_pausedMutex);
if (m_paused) {
m_pausedQueue.append(task.release());
continue;
}
}
if (terminationRequested())
break;
task->performTask();
pool.cycle();
}
}
void* DatabaseThread::databaseThread()
{
{
MutexLocker lock(m_threadCreationMutex);
LOG(StorageAPI, "Started DatabaseThread %p", this);
}
AutodrainedPool pool;
while (OwnPtr<DatabaseTask> task = m_queue.waitForMessage()) {
if (!m_paused || task->shouldPerformWhilePaused())
task->performTask();
else
m_pausedQueue.append(task.release());
pool.cycle();
}
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());
if (m_openDatabaseSet.size() > 0) {
DatabaseSet openSetCopy;
openSetCopy.swap(m_openDatabaseSet);
DatabaseSet::iterator end = openSetCopy.end();
for (DatabaseSet::iterator it = openSetCopy.begin(); it != end; ++it)
(*it)->close();
}
detachThread(m_threadID);
DatabaseTaskSynchronizer* cleanupSync = m_cleanupSync;
m_selfRef = 0;
if (cleanupSync) 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)
{
m_queue.append(task);
}
void DatabaseThread::scheduleImmediateTask(PassOwnPtr<DatabaseTask> task)
{
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)
{
SameDatabasePredicate predicate(database);
m_queue.removeIf(predicate);
}
} #endif