Function lock

src/include/unordered_map_concurrent.h:195–200

Lock the bin we point to, if not already locked.

        /// Lock the bin we point to, if not already locked.
        void lock () {
            if (m_bin >= 0 && !m_locked) {
                m_umc->m_bins[m_bin].lock();
                m_locked = true;
            }
        }
        /// Unlock the bin we point to, if locked.
        void unlock () {
            if (m_bin >= 0 && m_locked) {