Method acquireWrite

src/readwritelock.h:37–54

    }

    void acquireWrite(bool exclusive = true) {
        std::unique_lock<fastlock> rm(m_readLock, std::defer_lock);
        if (m_multi) {
            rm.lock();
            m_writeWaiting = true;
            while (m_readCount > 0)
                m_cv.wait(rm);
            if (exclusive) {
                /* Another thread might have the write lock while we have the internal lock
                but won't be able to release it until they can acquire the internal lock
                so release the internal lock and try again instead of waiting to avoid deadlock */
                while(!m_writeLock.try_lock())
                    m_cv.wait(rm);
            }
        }
        m_writeCount++;
        m_writeWaiting = false;
    }

    void upgradeWrite(bool exclusive = true) {
        releaseRead();