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clock_getres.2: Note POSIX.1 requirements re relative time services and CLOCK_REALTIME 

Signed-off-by: Michael Kerrisk <mtk.manpages@gmail.com>
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Michael Kerrisk 2016-12-13 09:09:44 +01:00
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commit f086b6aad1
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man2/clock_getres.2
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@ -243,6 +243,20 @@ are available.
(See also
.BR sysconf (3).)
.SH NOTES
POSIX.1 specifies the following:
.RS
.PP
Setting the value of the
.B CLOCK_REALTIME
clock via
.BR clock_settime (2)
shall have no effect on threads that are blocked waiting for a relative time
service based upon this clock, including the
.BR nanosleep ()
function; nor on the expiration of relative timers based upon this clock.
Consequently, these time services shall expire when the requested relative
interval elapses, independently of the new or old value of the clock.
.\"
.SS Historical note for SMP systems
Before Linux added kernel support for
.B CLOCK_PROCESS_CPUTIME_ID