DatabaseThread.cpp [plain text]
#include "config.h"
#include "DatabaseThread.h"
#if ENABLE(SQL_DATABASE)
#include "Database.h"
#include "DatabaseTask.h"
#include "Logging.h"
#include "SQLTransactionClient.h"
#include "SQLTransactionCoordinator.h"
#include <wtf/AutodrainedPool.h>
namespace WebCore {
DatabaseThread::DatabaseThread()
: m_threadID(0)
#if PLATFORM(IOS)
, m_paused(false)
#endif
, m_transactionClient(std::make_unique<SQLTransactionClient>())
, m_transactionCoordinator(std::make_unique<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)
{
m_cleanupSync = cleanupSync;
LOG(StorageAPI, "DatabaseThread %p was asked to terminate\n", this);
#if PLATFORM(IOS)
m_pausedQueue.kill();
#endif
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);
dbThread->databaseThread();
}
#if PLATFORM(IOS)
class DatabaseUnpauseTask : public DatabaseTask {
public:
static std::unique_ptr<DatabaseUnpauseTask> create(DatabaseThread* thread)
{
return std::unique_ptr<DatabaseUnpauseTask>(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();
}
#if !LOG_DISABLED
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<std::unique_ptr<DatabaseTask> > pausedTasks;
while (auto task = m_pausedQueue.tryGetMessage())
pausedTasks.append(WTF::move(task));
for (unsigned i = 0; i < pausedTasks.size(); ++i) {
AutodrainedPool pool;
std::unique_ptr<DatabaseTask> task(pausedTasks[i].release());
{
MutexLocker pausedLocker(m_pausedMutex);
if (m_paused) {
m_pausedQueue.append(WTF::move(task));
continue;
}
}
if (terminationRequested())
break;
task->performTask();
}
}
#endif //PLATFORM(IOS)
void DatabaseThread::databaseThread()
{
{
MutexLocker lock(m_threadCreationMutex);
LOG(StorageAPI, "Started DatabaseThread %p", this);
}
while (auto task = m_queue.waitForMessage()) {
AutodrainedPool pool;
#if PLATFORM(IOS)
if (!m_paused || task->shouldPerformWhilePaused())
task->performTask();
else
m_pausedQueue.append(WTF::move(task));
#else
task->performTask();
#endif
}
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).get()->close();
}
detachThread(m_threadID);
DatabaseTaskSynchronizer* cleanupSync = m_cleanupSync;
m_selfRef = 0;
if (cleanupSync) cleanupSync->taskCompleted();
}
void DatabaseThread::recordDatabaseOpen(DatabaseBackend* database)
{
ASSERT(currentThread() == m_threadID);
ASSERT(database);
ASSERT(!m_openDatabaseSet.contains(database));
m_openDatabaseSet.add(database);
}
void DatabaseThread::recordDatabaseClosed(DatabaseBackend* database)
{
ASSERT(currentThread() == m_threadID);
ASSERT(database);
ASSERT(m_queue.killed() || m_openDatabaseSet.contains(database));
m_openDatabaseSet.remove(database);
}
void DatabaseThread::scheduleTask(std::unique_ptr<DatabaseTask> task)
{
ASSERT(!task->hasSynchronizer() || task->hasCheckedForTermination());
m_queue.append(WTF::move(task));
}
void DatabaseThread::scheduleImmediateTask(std::unique_ptr<DatabaseTask> task)
{
ASSERT(!task->hasSynchronizer() || task->hasCheckedForTermination());
m_queue.prepend(WTF::move(task));
}
class SameDatabasePredicate {
public:
SameDatabasePredicate(const DatabaseBackend* database) : m_database(database) { }
bool operator()(const DatabaseTask& task) const { return task.database() == m_database; }
private:
const DatabaseBackend* m_database;
};
void DatabaseThread::unscheduleDatabaseTasks(DatabaseBackend* database)
{
SameDatabasePredicate predicate(database);
m_queue.removeIf(predicate);
}
} #endif