real-time system clock
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.
performs a variety of time related housekeeping tasks, such as:
- If the current process has virtual or profiling interval timers, update the timers and deliver appropriate signals.
- If there is no separate statistics clock, execute
- 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.
- Update the real-time timeout queue, calling
softclock() directly if the current interrupt priority is low enough.
hardclock() is implemented in the file
adjtime(2), hz(9), microtime(9), spl(9), timeout(9)