forked from qt-creator/qt-creator
6cfd843580
Change-Id: Ib694d2aeaef3b62caf3d3624e6b1c3e643197c2d Reviewed-by: Christian Kandeler <christian.kandeler@theqtcompany.com> Reviewed-by: Nikolai Kosjar <nikolai.kosjar@theqtcompany.com>
126 lines
3.8 KiB
C++
126 lines
3.8 KiB
C++
/****************************************************************************
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**
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** Copyright (C) 2014 Digia Plc and/or its subsidiary(-ies).
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** Contact: http://www.qt-project.org/legal
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**
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** This file is part of Qt Creator.
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**
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** Commercial License Usage
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** Licensees holding valid commercial Qt licenses may use this file in
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** accordance with the commercial license agreement provided with the
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** Software or, alternatively, in accordance with the terms contained in
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** a written agreement between you and Digia. For licensing terms and
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** conditions see http://www.qt.io/licensing. For further information
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** use the contact form at http://www.qt.io/contact-us.
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**
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** GNU Lesser General Public License Usage
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** Alternatively, this file may be used under the terms of the GNU Lesser
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** General Public License version 2.1 or version 3 as published by the Free
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** Software Foundation and appearing in the file LICENSE.LGPLv21 and
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** LICENSE.LGPLv3 included in the packaging of this file. Please review the
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** following information to ensure the GNU Lesser General Public License
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** requirements will be met: https://www.gnu.org/licenses/lgpl.html and
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** http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.
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**
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** In addition, as a special exception, Digia gives you certain additional
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** rights. These rights are described in the Digia Qt LGPL Exception
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** version 1.1, included in the file LGPL_EXCEPTION.txt in this package.
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**
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****************************************************************************/
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#include "stringtable.h"
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#include <utils/qtcassert.h>
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#include <QDebug>
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#include <QThreadPool>
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#include <QTime>
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using namespace CppTools::Internal;
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enum {
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GCTimeOut = 10 * 1000 // 10 seconds
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};
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StringTable::StringTable()
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: m_gcRunner(*this)
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, m_stopGCRequested(false)
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{
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m_strings.reserve(1000);
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m_gcRunner.setAutoDelete(false);
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m_gcCountDown.setObjectName(QLatin1String("StringTable::m_gcCountDown"));
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m_gcCountDown.setSingleShot(true);
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m_gcCountDown.setInterval(GCTimeOut);
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connect(&m_gcCountDown, SIGNAL(timeout()),
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this, SLOT(startGC()));
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}
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QString StringTable::insert(const QString &string)
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{
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if (string.isEmpty())
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return string;
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#if QT_SUPPORTS(UNSHARABLE_CONTAINERS)
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QTC_ASSERT(const_cast<QString&>(string).data_ptr()->ref.isSharable(), return string);
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#endif
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m_stopGCRequested.fetchAndStoreAcquire(true);
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QMutexLocker locker(&m_lock);
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QString result = *m_strings.insert(string);
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m_stopGCRequested.fetchAndStoreRelease(false);
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return result;
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}
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void StringTable::scheduleGC()
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{
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QMetaObject::invokeMethod(&m_gcCountDown, "start", Qt::QueuedConnection);
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}
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void StringTable::startGC()
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{
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QThreadPool::globalInstance()->start(&m_gcRunner);
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}
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enum {
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DebugStringTable = 0
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};
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static inline bool isQStringInUse(const QString &string)
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{
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QArrayData *data_ptr = const_cast<QString&>(string).data_ptr();
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return data_ptr->ref.isShared() || data_ptr->ref.isStatic();
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}
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void StringTable::GC()
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{
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QMutexLocker locker(&m_lock);
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int initialSize = 0;
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QTime startTime;
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if (DebugStringTable) {
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initialSize = m_strings.size();
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startTime = QTime::currentTime();
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}
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// Collect all QStrings which have refcount 1. (One reference in m_strings and nowhere else.)
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for (QSet<QString>::iterator i = m_strings.begin(); i != m_strings.end();) {
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if (m_stopGCRequested.testAndSetRelease(true, false))
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return;
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if (!isQStringInUse(*i))
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i = m_strings.erase(i);
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else
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++i;
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}
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if (DebugStringTable) {
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const int currentSize = m_strings.size();
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qDebug() << "StringTable::GC removed" << initialSize - currentSize
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<< "strings in" << startTime.msecsTo(QTime::currentTime())
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<< "ms, size is now" << currentSize;
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}
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}
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