[Octave-bug-tracker] [bug #52858] Consider using C gnulib clock_gettime() for Octave cputime()

[Mike Miller]

Follow-up Comment #2, bug #52858 (project octave):

Noting here that I would also like to look at using clock_gettime instead of
gettimeofday on supported systems for a higher resolution wall clock value as
well.

Both of these changes would need to affect the classes defined in
liboctave/sys/oct-time.h, replacing all of the microsecond fields with
nanosecond resolution fields.

Octave's configure script already checks for the existence of clock_gettime
and clock_settime, so code only needs to use the HAVE_CLOCK_GETTIME macro
already defined in config.h, as well as testing for the existence of whichever
CLOCK_FOO is desired.

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