Method acquireRead

src/readwritelock.h:15–23

    readWriteLock(const char *name) : m_readLock(name), m_writeLock(name) {}

    void acquireRead() {
        std::unique_lock<fastlock> rm(m_readLock, std::defer_lock);
        if (m_multi) {
            rm.lock();
            while (m_writeCount > 0 || m_writeWaiting)
                m_cv.wait(rm);
        }
        m_readCount++;
    }
    
    bool tryAcquireRead() {
        std::unique_lock<fastlock> rm(m_readLock, std::defer_lock);