qfactorycacheregistration.cpp

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// Copyright (C) 2022 The Qt Company Ltd.
// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR LGPL-3.0-only OR GPL-2.0-only OR GPL-3.0-only
 
#include "qfactorycacheregistration_p.h"
 
#include <QtCore/QMutex>
 
QT_BEGIN_NAMESPACE
 
#ifdef QT_USE_FACTORY_CACHE_REGISTRATION
 
static QBasicMutex registrationMutex;
static detail::QWinRTFactoryCacheRegistration *firstElement;
 
detail::QWinRTFactoryCacheRegistration::QWinRTFactoryCacheRegistration(
        QFunctionPointer clearFunction)
    : m_clearFunction(clearFunction)
{
    QMutexLocker lock(&registrationMutex);
 
    // forward pointers
    m_next = std::exchange(firstElement, this);
 
    // backward pointers
    m_prevNext = &firstElement;
    if (m_next)
        m_next->m_prevNext = &m_next;
}
 
detail::QWinRTFactoryCacheRegistration::~QWinRTFactoryCacheRegistration()
{
    QMutexLocker lock(&registrationMutex);
 
    *m_prevNext = m_next;
 
    if (m_next)
        m_next->m_prevNext = m_prevNext;
}
 
void detail::QWinRTFactoryCacheRegistration::clearAllCaches()
{
    QMutexLocker lock(&registrationMutex);
 
    detail::QWinRTFactoryCacheRegistration *element;
 
    for (element = firstElement; element != nullptr; element = element->m_next) {
        element->m_clearFunction();
    }
}
 
#endif
 
QT_END_NAMESPACE