NAME
hardclock
- real-time timer
SYNOPSIS
void
hardclock(
struct clockframe *
)
DESCRIPTION
The
hardclock(
)
function gets called
hz(9)
times per second.
It performs different tasks:
-
Run the current process's virtual and profile time (decrease the
corresponding timers, if they are activated, and generate
SIGVTALRM
or
SIGPROF
,
respectively).
-
Increment the time-of-day, taking care of any
ntpd(8)
or
adjtime(2)
induced changes and leap seconds, as well as any necessary
compensations to keep in sync with PPS signals or external clocks, if
support for this is in the kernel (see
options(4)).
-
Schedule softclock interrupts if any callouts should be triggered (see
callout(9)).
SEE ALSO
adjtime(2),
ntp_adjtime(2),
signal(7),
ntpd(8),
callout(9),
hz(9)