hardclock man page on OpenBSD

hardclock man page on OpenBSD

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HARDCLOCK(9)		     OpenBSD Kernel Manual		  HARDCLOCK(9)

NAME
     hardclock - real-time system clock

SYNOPSIS
     #include <sys/systm.h>

     void
     hardclock(struct clockframe *frame);

DESCRIPTION
     hardclock() implements the real-time system clock, interrupting hz(9)
     times a second.  The argument frame is an opaque, machine dependent
     structure that encapsulates the previous machine state.

     hardclock() performs a variety of time related housekeeping tasks, such
     as

	   o   If the current process has virtual or profiling interval
	       timers, update the timers and deliver appropriate signals.

	   o   If there is no separate statistics clock, execute statclock().

	   o   Increment the time of day, implementing any adjustments
	       requested by adjtime(2) or required as a result of running an
	       NTP daemon or other configured external clock.

	   o   Update the real-time timeout queue, calling softclock()
	       directly if the current interrupt priority is low enough.

CODE REFERENCES
     hardclock() is implemented in the file sys/kern/kern_clock.c.

SEE ALSO
     adjtime(2), hz(9), microtime(9), spl(9), time(9), timeout(9)

OpenBSD 4.9			 May 31, 2007			   OpenBSD 4.9

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