BSD FAQ for clock_gettime(CLOCK_REALTIME)

> 1. Is clock_gettime(CLOCK_REALTIME) consistent across all processors/cores?
>    (Does arch matter?  e.g. ppc, arm, x86, amd64, sparc).

> 2. Does clock_gettime(CLOCK_REALTIME) pick up the new time when a user
>    (e.g. root) changes the current time on their computer?

> 3. Does clock_gettime(CLOCK_REALTIME) pick up NTP changes?
> 4. Does clock_gettime(CLOCK_REALTIME) pick up NTP clock slew?

> 5. gettimeofday() returns usec.  Aside from that, what are the differences
>    between gettimeofday() and clock_gettime(CLOCK_REALTIME)?  Which would you
>    recommend programmers use?

>    Is the 2038/2106 problem a possibility for any of these?

> 6. How about setting the current time:  what are the differences between
>    settimeofday() and clock_settime(CLOCK_REALTIME)?

> 7. How does clock_gettime(CLOCK_REALTIME) work?  Let's assume the most recent
>    production releases of OpenBSD and FreeBSD on the following:

>    32bit single core, single socket

>    64bit single core, single socket

>    64bit multi-core, multi-socket

>    64bit multi-core, single-socket laptop/notebook

> 8. Are there any interesting points / implementation notes worth knowing about
>    clock_gettime(CLOCK_REALTIME)?  Any notes regarding virtual machines?

> 9. Closing Comments.