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HARDCLOCK(9)             BSD 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:
     o   Run the current process's virtual and profile time (decrease the cor-
         responding timers, if they are activated, and generate SIGVTALRM or
         SIGPROF, respectively).
     o   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)).
     o   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)

BSD                            September 5, 2001                           BSD