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clock_gettime.2: Clarify CLOCK_*

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Clarify that CLOCK_* (e.g., CLOCK_REALTIME) do not necessarily default
to CLOCK_*_FAST.

PR:		259642
This commit is contained in:
Mateusz Piotrowski 2022-07-08 21:54:10 +02:00
parent 13a9da7d55
commit 16e4487e5f
1 changed files with 12 additions and 3 deletions
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15
lib/libc/sys/clock_gettime.2
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@ -96,19 +96,28 @@ Returns the execution time of the calling thread.
.El
.Pp
The clock IDs
.Fa CLOCK_REALTIME ,
.Fa CLOCK_MONOTONIC ,
and
.Fa CLOCK_UPTIME
perform a full time counter query.
The clock IDs with the _FAST suffix, i.e.,
.Fa CLOCK_REALTIME_FAST ,
.Fa CLOCK_MONOTONIC_FAST ,
.Fa CLOCK_UPTIME_FAST
are analogs of corresponding IDs without _FAST suffix but do not perform
and
.Fa CLOCK_UPTIME_FAST ,
do not perform
a full time counter query, so their accuracy is one timer tick.
Similarly,
.Fa CLOCK_REALTIME_PRECISE ,
.Fa CLOCK_MONOTONIC_PRECISE ,
and
.Fa CLOCK_UPTIME_PRECISE
are used to get the most exact value as possible, at the expense of
execution time.
The clock IDs
.Fa CLOCK_REALTIME_COARSE ,
.Fa CLOCK_REALTIME_COARSE
and
.Fa CLOCK_MONOTONIC_COARSE
are aliases of corresponding IDs with _FAST suffix for compatibility with other
systems.