36     timespec current {};  in SystemMicroSecond()  local
37     clock_gettime(CLOCK_MONOTONIC, &current);  in SystemMicroSecond()
39     return static_cast<uint64_t>(current.tv_sec) * UINT64_C(1000000) +  // 1000000 - time  in SystemMicroSecond()
40            current.tv_nsec / UINT64_C(1000);                            // 1000 - time  in SystemMicroSecond()
45     timespec current {};  in RealTimeSecond()  local
46     clock_gettime(CLOCK_REALTIME, &current);  in RealTimeSecond()
48     return static_cast<uint64_t>(current.tv_sec);  in RealTimeSecond()
60     timespec current {};  in GetCpuMicroSecond()  local
61     clock_gettime(clock_id, &current);  in GetCpuMicroSecond()
63     return static_cast<uint64_t>(current.tv_sec) * UINT64_C(1000000) +  // 1000000 - time  in GetCpuMicroSecond()
64            current.tv_nsec / UINT64_C(1000);                            // 1000 - time  in GetCpuMicroSecond()