Race in histogram reset and dump

 void HdrHistogram::reset() {

    hdr_reset(histogram.get());

}

template <typename T>

inline void add_casted_histo_stat(const char* k,

                                  const T& v,

                                  const AddStatFn& add_stat,

                                  const void* cookie) {

    if (v.getValueCount() > 0) {

        std::string meanKey(k);

        meanKey += "_mean";

        add_casted_stat(

                meanKey.c_str(), std::round(v.getMean()), add_stat, cookie);

        HdrHistogram::Iterator iter{v.getHistogramsIterator()};

        while (auto result = v.getNextBucketLowHighAndCount(iter)) {

            if (std::get<2>(*result) > 0) {

                std::string newKey(k);

                newKey += "_" + std::to_string(std::get<0>(*result)) + "," +

                          std::to_string(std::get<1>(*result));

                add_casted_stat(

                        newKey.c_str(), std::get<2>(*result), add_stat, cookie);

            }

        }

    }

}