qt - QMutex 被未知线程锁定

Question

在下面的代码中，我得到一个 ASSERT in unlock ()，因为lockingThreads (a QList<QThread*>) 不包含解锁（当前）线程。检查lockingThreads，我发现一个“ntdll”线程，我不知道它做了什么，只能访问不提供有用信息的反汇编。这个问题很难重现，所以感谢任何提示（可能是这个逻辑中的一个愚蠢的转折）。

编辑：互斥锁是递归的。

MyMutex::MyMutex (QMutex::RecursionMode mode)
: QMutex (mode)
, lockCount (0)
{
}

MyMutex::~MyMutex ()
{
    ASSERT (lockingThreads.isEmpty ());
}

void MyMutex::lock ()
{
    lockCount++;
#if MYDEBUG
    // grab thread before lock so we can identify it if it deadlocks here
    QThread* thread = QThread::currentThread ();
    if (!isRecursive ())
    {
        ASSERT (!lockingThreads.contains (thread));
        if (!lockingThreads.contains (thread))
            lockingThreads += thread;
    }
    else
        lockingThreads += thread;
#endif

    QMutex::lock ();
}

void MyMutex::unlock ()
{
#if MYDEBUG
    QThread* thread = QThread::currentThread ();
    ASSERT (lockingThreads.contains (thread));
    lockingThreads.removeOne (thread);
    if (lockingThreads.contains (thread) && !isRecursive ())
        ASSERTFALSE;
#endif
    QMutex::unlock ();
    lockCount--;
}