libc%2B%2B/src/chrono.cpp

85 //   mach_absolute_time() * MachInfo.numer / MachInfo.denom is the number of
86 //   nanoseconds since the computer booted up.  MachInfo.numer and MachInfo.denom
90 // MachInfo.numer / MachInfo.denom is often 1 on the latest equipment.  Specialize
106     mach_timebase_info_data_t MachInfo;
107     mach_timebase_info(&MachInfo);
108     return static_cast<double>(MachInfo.numer) / MachInfo.denom;
125     mach_timebase_info_data_t MachInfo;
126     mach_timebase_info(&MachInfo);
127     if (MachInfo.numer == MachInfo.denom)