diff options
Diffstat (limited to 'share/man/man9/timeout.9')
| -rw-r--r-- | share/man/man9/timeout.9 | 35 |
1 files changed, 34 insertions, 1 deletions
diff --git a/share/man/man9/timeout.9 b/share/man/man9/timeout.9 index c671467..c63c201 100644 --- a/share/man/man9/timeout.9 +++ b/share/man/man9/timeout.9 @@ -29,7 +29,7 @@ .\" .\" $FreeBSD$ .\" -.Dd November 1, 2012 +.Dd February 19, 2013 .Dt TIMEOUT 9 .Os .Sh NAME @@ -44,6 +44,9 @@ .Nm callout_reset , .Nm callout_reset_on , .Nm callout_reset_curcpu , +.Nm callout_reset_sbt , +.Nm callout_reset_sbt_on , +.Nm callout_reset_sbt_curcpu , .Nm callout_schedule , .Nm callout_schedule_on , .Nm callout_schedule_curcpu , @@ -82,6 +85,9 @@ struct callout_handle handle = CALLOUT_HANDLE_INITIALIZER(&handle); .Fn callout_reset_on "struct callout *c" "int ticks" "timeout_t *func" \ "void *arg" "int cpu" .Ft int +.Fn callout_reset_sbt_on "struct callout *c" "sbintime_t sbt" \ +"sbintime_t pr" "timeout_t *func" "void *arg" "int cpu" "int flags" +.Ft int .Fn callout_reset_curcpu "struct callout *c" "int ticks" "timeout_t *func" \ "void *arg" .Ft int @@ -326,6 +332,33 @@ and .Fn callout_schedule but take an extra parameter specifying the target CPU for the callout. .Pp +The function +.Fn callout_reset_sbt_on +allows to get higher time resolution, taking relative or absolute time +and precision instead of relative ticks count. +If specified time is in past, it will be silently converted to present +to run handler as soon as possible. +.Pp +The following +.Fa flags +may be specified: +.Bl -tag -width ".Dv C_DIRECT_EXEC" +.It Dv C_ALSOLUTE +Handle the +.Fa sbt +argument as absolute time of the event since boot, or relative time otherwise. +.It Dv C_DIRECT_EXEC +Run handler directly from hardware interrupt context instead of softclock swi. +It is faster, but puts more constraints on handlers. +Handlers may use only spin mutexes for locking, and they must be fast because +they run with absolute priority. +.It Fn C_PREL +Specifies relative event time precision as binary logarithm of time interval +divided by acceptable time deviation: 1 -- 1/2, 2 -- 1/4, etc. +Smaller value allows to aggregate more events in one timer interrupt to +reduce processing overhead and power consumption. +.El +.Pp The functions .Fn callout_reset_curcpu and |
