blob: 95b7c6befe2a641345e812388ead0fd9cb2c79bc [file] [log] [blame]
/*
* 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 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.
*/
#pragma once
#include <memory>
#include <wtf/HashSet.h>
#include <wtf/Lock.h>
#include <wtf/MessageQueue.h>
#include <wtf/RefPtr.h>
#include <wtf/Threading.h>
namespace WebCore {
class Database;
class DatabaseTask;
class DatabaseTaskSynchronizer;
class Document;
class SQLTransactionCoordinator;
class DatabaseThread : public ThreadSafeRefCounted<DatabaseThread> {
public:
static Ref<DatabaseThread> create() { return adoptRef(*new DatabaseThread); }
~DatabaseThread();
void start();
void requestTermination(DatabaseTaskSynchronizer* cleanupSync);
bool terminationRequested(DatabaseTaskSynchronizer* = nullptr) const;
void scheduleTask(std::unique_ptr<DatabaseTask>&&);
void scheduleImmediateTask(std::unique_ptr<DatabaseTask>&&); // This just adds the task to the front of the queue - the caller needs to be extremely careful not to create deadlocks when waiting for completion.
void unscheduleDatabaseTasks(Database&);
bool hasPendingDatabaseActivity() const;
void recordDatabaseOpen(Database&);
void recordDatabaseClosed(Database&);
Thread* getThread() { return m_thread.get(); }
SQLTransactionCoordinator* transactionCoordinator() { return m_transactionCoordinator.get(); }
private:
DatabaseThread();
void databaseThread();
Lock m_threadCreationMutex;
RefPtr<Thread> m_thread;
RefPtr<DatabaseThread> m_selfRef;
MessageQueue<DatabaseTask> m_queue;
// This set keeps track of the open databases that have been used on this thread.
using DatabaseSet = HashSet<RefPtr<Database>>;
mutable Lock m_openDatabaseSetLock;
DatabaseSet m_openDatabaseSet WTF_GUARDED_BY_LOCK(m_openDatabaseSetLock);
std::unique_ptr<SQLTransactionCoordinator> m_transactionCoordinator;
DatabaseTaskSynchronizer* m_cleanupSync { nullptr };
};
} // namespace WebCore