mach_timebase_info    8 src/runtime/osx_clock.cpp typedef struct mach_timebase_info *mach_timebase_info_t;
mach_timebase_info    9 src/runtime/osx_clock.cpp typedef struct mach_timebase_info  mach_timebase_info_data_t;
mach_timebase_info   22 src/runtime/osx_clock.cpp extern kern_return_t mach_timebase_info(mach_timebase_info_t info);
mach_timebase_info   27 src/runtime/osx_clock.cpp         mach_timebase_info(&halide_timebase_info);