hardclock(9) - NetBSD Manual Pages

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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 1.6.2                   September 5, 2001                             1