hardclock(9) - NetBSD Manual Pages

HARDCLOCK(9)                 NetBSD Kernel Manual                 HARDCLOCK(9)


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 cor- responding 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 compensa- tions 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) NetBSD 1.6 September 5, 2001 1

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