diff options
Diffstat (limited to 'lib/libc/sys/clock_gettime.2')
| -rw-r--r-- | lib/libc/sys/clock_gettime.2 | 15 |
1 files changed, 12 insertions, 3 deletions
diff --git a/lib/libc/sys/clock_gettime.2 b/lib/libc/sys/clock_gettime.2 index b04732fc993e..21526a98bd40 100644 --- a/lib/libc/sys/clock_gettime.2 +++ b/lib/libc/sys/clock_gettime.2 @@ -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. |