删除 QThreads 时检测到数据争用

问：

我正在做一个多线程项目，我正在尝试使用 helgrind（valgrind 工具）检测线程不一致。

关闭应用程序后，我收到多个报告，如下所示：

==50932== Possible data race during read of size 8 at 0x3413C718 by thread #26
==50932== Locks held: none
==50932==    at 0xB91ED11: QObjectPrivate::ConnectionData::removeConnection(QObjectPrivate::Connection*) (in /usr/local/qt5/lib/libQt5Core.so.5.15.10)
==50932==    by 0xB92A4E2: QObject::~QObject() (in /usr/local/qt5/lib/libQt5Core.so.5.15.10)\
==50932==    by 0x525E9F: classA::~classA() (classA.cpp:52)
==50932==    by 0x525EC3: classA::~classA() (classA.cpp:52)
==50932==    by 0xB922012: QObject::event(QEvent*) (in /usr/local/qt5/lib/libQt5Core.so.5.15.10)
==50932==    by 0x9CC66D2: QApplicationPrivate::notify_helper(QObject*, QEvent*) (in /usr/local/qt5/lib/libQt5Widgets.so.5.15.10)
==50932==    by 0xB8F4E19: QCoreApplication::notifyInternal2(QObject*, QEvent*) (in /usr/local/qt5/lib/libQt5Core.so.5.15.10)
==50932==    by 0xB8F7F06: QCoreApplicationPrivate::sendPostedEvents(QObject*, int, QThreadData*) (in /usr/local/qt5/lib/libQt5Core.so.5.15.10)
==50932==    by 0xB94EA36: ??? (in /usr/local/qt5/lib/libQt5Core.so.5.15.10)
==50932==    by 0xCCA8D3A: g_main_context_dispatch (in /usr/lib/x86_64-linux-gnu/libglib-2.0.so.0.7200.4)
==50932==    by 0xCCFE257: ??? (in /usr/lib/x86_64-linux-gnu/libglib-2.0.so.0.7200.4)
==50932==    by 0xCCA63E2: g_main_context_iteration (in /usr/lib/x86_64-linux-gnu/libglib-2.0.so.0.7200.4)
==50932==
==50932== This conflicts with a previous write of size 8 by thread #25
==50932== Locks held: none
==50932==    at 0xB91ED20: QObjectPrivate::ConnectionData::removeConnection(QObjectPrivate::Connection*) (in /usr/local/qt5/lib/libQt5Core.so.5.15.10)
==50932==    by 0xB92A4E2: QObject::~QObject() (in /usr/local/qt5/lib/libQt5Core.so.5.15.10)
==50932==    by 0x468CA9: IclassB::~IclassB() (IclassB.h:43)
==50932==    by 0x4646ED: classB::~classB() (classB.cpp:75)
==50932==    by 0x464711: classB::~classB() (classB.cpp:75)
==50932==    by 0xB922012: QObject::event(QEvent*) (in /usr/local/qt5/lib/libQt5Core.so.5.15.10)
==50932==    by 0x9CC66D2: QApplicationPrivate::notify_helper(QObject*, QEvent*) (in /usr/local/qt5/lib/libQt5Widgets.so.5.15.10)
==50932==    by 0xB8F4E19: QCoreApplication::notifyInternal2(QObject*, QEvent*) (in /usr/local/qt5/lib/libQt5Core.so.5.15.10)
==50932==  Address 0x3413c718 is 8 bytes inside a block of size 88 alloc'd
==50932==    at 0x484AFF5: operator new(unsigned long) (vg_replace_malloc.c:483)
==50932==    by 0xB9233E4: QObjectPrivate::connectImpl(QObject const*, int, QObject const*, void**, QtPrivate::QSlotObjectBase*, Qt::ConnectionType, int const*, QMetaObject const*) (in /usr/local/qt5/lib/libQt5Core.so.5.15.10)
==50932==    by 0xB923964: QObject::connectImpl(QObject const*, void**, QObject const*, void**, QtPrivate::QSlotObjectBase*, Qt::ConnectionType, int const*, QMetaObject const*) (in /usr/local/qt5/lib/libQt5Core.so.5.15.10)
==50932==    by 0x3E52AF: std::enable_if<QtPrivate::FunctionPointer<MainWindow::MainWindow(QWidget*)::{lambda()#31}>::ArgumentCount==(-1), QMetaObject::Connection>::type QObject::connect<void> (QObject::*)(QObject*), MainWindow::MainWindow(QWidget*)::{lambda()#31}>(QtPrivate::FunctionPointer<void> (QObject::*)(QObject*)>::Object const*, void (QObject::*)(QObject*), > QObject const*, MainWindow::MainWindow(QWidget*)::{lambda()#31}, > Qt::ConnectionType) (qobject.h:347)
==50932==    by 0x3D2149: MainWindow::MainWindow(QWidget*) (mainwindow.cpp:633)
==50932==    by 0x374017: main (main.cpp:199)
==50932==  Block was alloc'd by thread #1
==50932==

所以我有 2 个类在不同的线程中运行，当我关闭应用程序时，它们似乎都可以访问，并且由于此方法来自 Qt 框架本身，因此似乎无法解决数据竞争。QObjectPrivate::ConnectionData::removeConnection()

IclassB是接口，所以它没有实现任何内容。classB

线程 A 和 B 都访问其析构函数，它们是：

classB::~classB()
{
    if (d != nullptr)
    {
        delete d->member;
        delete d;
    }
}

和

classA::~classA()
{
    if (d != nullptr)
    {
        if (d->mm->isActive())
            d->mm->stop();
        delete d;
    }

}

我看不出析构函数有什么奇怪的地方。我只是想确保这个数据竞赛是误报，因为我有很多这种类型。