hardclock(9) - NetBSD Manual Pages

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HARDCLOCK(9)           NetBSD Kernel Developer's 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 5.0 September 5, 2001 NetBSD 5.0
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