Function GenerateTraceId

src/brpc/span.cpp:180–188

}

inline uint64_t GenerateTraceId() {
    // 0 is an invalid Id
    IdGen* g = &tls_trace_id_gen;
    if (g->seq == 0) {
        UpdateTLSRandom64(g);
        g->seq = 1;
    }
    return (g->current_random & 0xFFFFFFFFFFFF0000ULL) | g->seq++;
}

Span::Span(Forbidden) {
    CHECK_EQ(0, pthread_spin_init(&_info_spinlock, 0))