Method tryAcquireRead

src/readwritelock.h:25–35

    }
    
    bool tryAcquireRead() {
        std::unique_lock<fastlock> rm(m_readLock, std::defer_lock);
        if (m_multi) {
            if (!rm.try_lock())
                return false;
            if (m_writeCount > 0 || m_writeWaiting)
                return false;
        }
        m_readCount++;
        return true;
    }

    void acquireWrite(bool exclusive = true) {
        std::unique_lock<fastlock> rm(m_readLock, std::defer_lock);