HARDCLOCK(9) BSD Kernel Manual HARDCLOCK(9)
hardclock - real-time system clock
#include <sys/systm.h> void hardclock(struct clockframe *frame);
hardclock() implements the real-time system clock, interrupting hz(9) times a second. The argument frame is an opaque, machine dependent struc- ture that encapsulates the previous machine state. hardclock() performs a variety of time related housekeeping tasks, such as • If the current process has virtual or profiling interval ti- mers, update the timers and deliver appropriate signals. • If there is no separate statistics clock, execute statclock(). • Increment the time of day, implementing any adjustments re- quested by adjtime(2) or required as a result of running an NTP daemon or other configured external clock. • Update the real-time timeout queue, calling softclock() direct- ly if the current interrupt priority is low enough.
adjtime(2), hz(9), microtime(9), spl(9), time(9), timeout(9)
hardclock() is implemented in the file sys/kern/kern_clock.c. MirOS BSD #10-current July 14, 2001 1
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