forked from qt-creator/qt-creator
f5f3bbcc59
Change-Id: Ia3c6f6dca53c5d7487b0813de16f06c52af47aa5 Reviewed-by: Eike Ziller <eike.ziller@qt.io>
60 lines
1.6 KiB
C++
60 lines
1.6 KiB
C++
// Copyright (C) 2021 The Qt Company Ltd.
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// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR GPL-3.0+ OR GPL-3.0 WITH Qt-GPL-exception-1.0
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#include "qtcassert.h"
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#include "singleton.h"
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#include "threadutils.h"
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#include <QList>
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#include <unordered_map>
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using namespace Utils;
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namespace Utils {
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// The order of elements reflects dependencies, i.e.
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// if B requires A then B will follow A on this list
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static QList<Singleton *> s_singletonList;
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static QMutex s_mutex;
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static std::unordered_map<std::type_index, SingletonStaticData> s_staticDataList;
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Singleton::~Singleton()
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{
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QMutexLocker locker(&s_mutex);
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s_singletonList.removeAll(this);
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}
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void Singleton::addSingleton(Singleton *singleton)
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{
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QMutexLocker locker(&s_mutex);
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s_singletonList.append(singleton);
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}
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SingletonStaticData &Singleton::staticData(std::type_index index)
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{
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QMutexLocker locker(&s_mutex);
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return s_staticDataList[index];
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}
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// Note: it's caller responsibility to ensure that this function is being called when all other
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// threads don't use any singleton. As a good practice: finish all other threads that were using
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// singletons before this function is called.
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// Some singletons may work only in main thread, so this method should be called from main thread
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// only.
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void Singleton::deleteAll()
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{
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QTC_ASSERT(isMainThread(), return);
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QList<Singleton *> oldList;
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{
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QMutexLocker locker(&s_mutex);
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oldList = s_singletonList;
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s_singletonList = {};
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}
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// Keep the reverse order when deleting
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while (!oldList.isEmpty())
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delete oldList.takeLast();
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}
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} // namespace Utils
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