Method lockForRead

kdevplatform/language/duchain/duchainlock.cpp:64–94

DUChainLock::~DUChainLock() = default;

bool DUChainLock::lockForRead(unsigned int timeout)
{
    Q_D(DUChainLock);

    ///Step 1: Increase the own reader-recursion. This will make sure no further write-locks will succeed
    d->changeOwnReaderRecursion(1);

    QThread* w = d->m_writer.loadAcquire();
    if (w == nullptr || w == QThread::currentThread()) {
        //Successful lock: Either there is no writer, or we hold the write-lock by ourselves
    } else {
        ///Step 2: Start spinning until there is no writer any more

        QElapsedTimer t;
        if (timeout) {
            t.start();
        }

        while (d->m_writer.loadAcquire()) {
            if (!timeout || t.elapsed() < timeout) {
                QThread::usleep(uSleepTime);
            } else {
                //Fail!
                d->changeOwnReaderRecursion(-1);
                return false;
            }
        }
    }

    return true;
}

void DUChainLock::releaseReadLock()
{